[svn-r503] HDF5 Reference Manual
Updated for Alpha2.
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Frank Baker
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<html>
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<head><title>
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HDF5/H5S Draft API Specification
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</title></head>
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<body>
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<hr>
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<center>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<a href="RM_H5.html">H5</a>
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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<a href="RM_H5F.html">H5F</a>
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5P.html">H5P</a>
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H5S
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Glossary.html">Glossary</a>
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</center>
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<hr>
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<center>
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<h1>H5S: Dataspace Interface</h1>
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</center>
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<h2>Dataspace Object API Functions</h2>
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These functions create and manipulate the dataspace in which to store the
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elements of a dataset.
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<table border=0>
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<tr><td valign=top>
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<ul>
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<li><a href="#Dataspace-Create">H5Screate</a>
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<li><a href="#Dataspace-CreateSimple">H5Screate_simple</a>
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<li><a href="#Dataspace-Copy">H5Scopy</a>
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<li><a href="#Dataspace-SelectNpoints">H5Sselect_npoints</a>
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<li><a href="#Dataspace-SelectElements">H5Sselect_elements</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataspace-ExtentNpoints">H5Sextent_npoints</a>
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<li><a href="#Dataspace-ExtentNdims">H5Sextent_ndims</a>
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<li><a href="#Dataspace-ExtentDims">H5Sextent_dims</a>
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<li><a href="#Dataspace-GetClass">H5Sget_class</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataspace-SetExtentSimple">H5Sset_extent_simple</a>
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<li><a href="#Dataspace-IsSimple">H5Sis_simple</a>
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<li><a href="#Dataspace-SelectHyperslab">H5Sselect_hyperslab</a>
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<li><a href="#Dataspace-Close">H5Sclose</a>
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</ul>
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</td></tr>
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</table>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-Create">H5Screate</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t</em> <code>H5Screate</code>(<em>H5S_class_t</em> <code>type</code>)
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<dt><strong>Purpose:</strong>
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<dd>Creates a new dataspace of a specified type.
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<dt><strong>Description:</strong>
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<dd><code>H5Screate</code> creates a new dataspace of a particular
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<code>type</code>.
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The types currently supported are <code>H5S_SCALAR</code>,
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<code>H5S_SIMPLE</code>, and <code>H5S_NONE</code>;
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others are planned to be added later. The <code>H5S_NONE</code>
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dataspace can only hold a selection, not an extent.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5S_class_t</em> <code>type</code>
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<dd>The type of dataspace to be created.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataspace identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-CreateSimple">H5Screate_simple</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t</em> <code>H5Screate_simple</code>(<em>int</em> <code>rank</code>,
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<em>const hsize_t *</em> <code>dims</code>,
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<em>const hsize_t *</em> <code>maxdims</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Creates a new simple data space and opens it for access.
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<dt><strong>Description:</strong>
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<dd><code>H5Screate_simple</code> creates a new simple data space
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and opens it for access. The <code>rank</code> is the number of
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dimensions used in the dataspace.
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The <code>dims</code> argument is the size
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of the simple dataset and the <code>maxdims</code> argument is
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the upper limit on the size of the dataset. <code>maxdims</code>
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may be the null pointer in which case the upper limit is the
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same as <code>dims</code>. If an element of <code>maxdims</code>
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is zero then the corresponding dimension is unlimited, otherwise
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no element of <code>maxdims</code> should be smaller than the
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corresponding element of <code>dims</code>. The dataspace
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identifier returned from this function should be released with
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<code>H5Sclose</code> or resource leaks will occur.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>int</em> <code>rank</code>
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<dd>Number of dimensions of dataspace.
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<dt><em>const hsize_t *</em> <code>dims</code>
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<dd>An array of the size of each dimension.
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<dt><em>const hsize_t *</em> <code>maxdims</code>
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<dd>An array of the maximum size of each dimension.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataspace identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-Copy">H5Scopy</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Scopy</code>(<em>hid_t </em><code>space_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Creates an exact copy of a dataspace.
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<dt><strong>Description:</strong>
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<dd><code>H5Scopy</code> creates a new dataspace which is an exact
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copy of the dataspace identified by <code>space_id</code>.
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The dataspace identifier returned from this function should be
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released with <code>H5Sclose</code> or resource leaks will occur.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Identifier of dataspace to copy.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataspace identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-SelectElements">H5Sselect_elements</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Sselect_elements</code>(<em>hid_t </em><code>space_id</code>,
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<em>dh5s_selopt_t</em> <code>op</code>,
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<em>const size_t</em> <code>num_elements</code>,
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<em>const hssize_t *</em><code>coord</code>[ ]
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)
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<dt><strong>Purpose:</strong>
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<dd>Selects array elements to be included in the selection for a dataspace.
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<dt><strong>Description:</strong>
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<dd><code>H5Sselect_elements</code> selects array elements to be
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included in the selection for the <code>space_id</code>
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dataspace. The number of elements selected must be set with
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the <code>num_elements</code>. The <code>coord</code> array
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is a two-dimensional array of size <em>dataspace rank</em>
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by <code>num_elements</code> (ie. a list of coordinates in
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the array). The order of the element coordinates in the
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<code>coord</code> array also specifies the order in which
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the array elements are iterated through when I/O is performed.
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Duplicate coordinate locations are not checked for.
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<P>
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The selection operator <code>op</code> determines how the
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new selection is to be combined with the previously existing
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selection for the dataspace. Currently, only the
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<code>H5S_SELECT_SET</code> operator is supported, which
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replaces the existing selection with the parameters from
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this call. When operators other than <code>H5S_SELECT_SET</code>
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are used to combine a new selection with an existing selection,
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the selection ordering is reset to 'C' array ordering.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Identifier of the dataspace.
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<dt><em>dh5s_selopt_t</em> <code>op</code>
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<dd>operator specifying how the new selection is to be
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combined with the existing selection for the dataspace.
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<dt><em>const size_t</em> <code>num_elements</code>
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<dd>Number of elements to be selected.
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<dt><em>const hssize_t *</em><code>coord</code>[ ]
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<dd>A 2-dimensional array specifying the coordinates of the
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elements being selected.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-ExtentNpoints">H5Sextent_npoints</a>
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<dt><strong>Signature:</strong>
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<dd><em>hsize_t</em> <code>H5Sextent_npoints</code>(<em>hid_t </em><code>space_id</code>)
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<dt><strong>Purpose:</strong>
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<dd>Determines the number of elements in a dataspace.
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<dt><strong>Description:</strong>
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<dd><code>H5Sextent_npoints</code> determines the number of elements
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in a dataspace. For example, a simple 3-dimensional dataspace
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with dimensions 2, 3, and 4 would have 24 elements.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>ID of the dataspace object to query
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns the number of elements in the dataspace if successful;
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otherwise returns 0.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-SelectNpoints">H5Sselect_npoints</a>
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<dt><strong>Signature:</strong>
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<dd><em>hsize_t</em> <code>H5Sselect_npoints</code>(<em>hid_t</em> <code>space_id</code>)
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<dt><strong>Purpose:</strong>
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<dd>Determines the number of elements in a dataspace.
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<dt><strong>Description:</strong>
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<dd><code>H5Sselect_npoints</code> determines the number of elements
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in the current selection of a dataspace.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Dataspace identifier.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataspace identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-ExtentNdims">H5Sextent_ndims</a>
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<dt><strong>Signature:</strong>
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<dd><em>int</em> <code>H5Sextent_ndims</code>(<em>hid_t</em> <code>space_id</code>)
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<dt><strong>Purpose:</strong>
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<dd>Determines the dimensionality of a dataspace.
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<dt><strong>Description:</strong>
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<dd><code>H5Sextent_ndims</code> determines the dimensionality (or rank)
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of a dataspace.
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<dt><strong>Parameters:</strong>
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<dl>
|
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Identifier of the dataspace
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns the number of dimensions in the dataspace if successful;
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otherwise FAIL (-1)
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-ExtentDims">H5Sextent_dims</a>
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<dt><strong>Signature:</strong>
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<dd><em>int</em> <code>H5Sextent_dims</code>(<em>hid_t</em> <code>space_id</code>,
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<em>hsize_t *</em><code>dims</code>,
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<em>hsize_t *</em><code>maxdims</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Retrieves dataspace dimension size and maximum size.
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<dt><strong>Description:</strong>
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<dd><code>H5Sextent_dims</code> returns the size and maximum sizes
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of each dimension of a dataspace through the <code>dims</code>
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and <code>maxdims</code> parameters.
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<dt><strong>Parameters:</strong>
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<dl>
|
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>IN: Identifier of the dataspace object to query
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<dt><em>hsize_t *</em><code>dims</code>
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<dd>OUT: Pointer to array to store the size of each dimension.
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<dt><em>hsize_t *</em><code>maxdims</code>
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<dd>OUT: Pointer to array to store the maximum size of each dimension.
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</dl>
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<dt><strong>Returns:</strong>
|
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<dd>Returns the number of dimensions in the dataspace if successful;
|
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otherwise FAIL (-1).
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</dl>
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|
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataspace-SetExtentSimple">H5Sset_extent_simple</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5S_set_extent_simple</code>(<em>hid_t</em> <code>space_id</code>,
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<em>int</em> <code>rank</code>,
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<em>const hsize_t *</em><code>current_size</code>,
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<em>const hsize_t *</em><code>maximum_size</code>
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)
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<dt><strong>Purpose:</strong>
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||||
<dd>Sets or resets the size of an existing dataspace.
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<dt><strong>Description:</strong>
|
||||
<dd><code>H5S_set_extent_simple</code> sets or resets the size of
|
||||
an existing dataspace.
|
||||
<p>
|
||||
<code>rank</code> is the dimensionality, or number of
|
||||
dimensions, of the dataspace.
|
||||
<p>
|
||||
<code>current_size</code> is an array of size <code>rank</code>
|
||||
which contains the new size of each dimension in the dataspace.
|
||||
<code>maximum_size</code> is an array of size <code>rank</code>
|
||||
which contains the maximum size of each dimension in the
|
||||
dataspace.
|
||||
<p>
|
||||
Any previous extent is removed from the dataspace, the dataspace
|
||||
type is set to <code>H5S_SIMPLE</code>, and the extent is set as
|
||||
specified.
|
||||
<dt><strong>Parameters:</strong>
|
||||
<dl>
|
||||
<dt><em>hid_t</em> <code>space_id</code>
|
||||
<dd>Dataspace identifier.
|
||||
<dt><em>int</em> <code>rank</code>
|
||||
<dd>Rank, or dimensionality, of the dataspace.
|
||||
<dt><em>const hsize_t *</em><code>current_size</code>
|
||||
<dd>Array containing current size of dataspace.
|
||||
<dt><em>const hsize_t *</em><code>maximum_size</code>
|
||||
<dd>Array containing maximum size of dataspace.
|
||||
</dl>
|
||||
<dt><strong>Returns:</strong>
|
||||
<dd>Returns a dataspace identifier if successful;
|
||||
otherwise FAIL (-1).
|
||||
</dl>
|
||||
|
||||
|
||||
<hr>
|
||||
<dl>
|
||||
<dt><strong>Name:</strong> <a name="Dataspace-IsSimple">H5Sis_simple</a>
|
||||
<dt><strong>Signature:</strong>
|
||||
<dd><em>hbool_t </em><code>H5Sis_simple</code>(<em>hid_t </em><code>space_id</code>)
|
||||
<dt><strong>Purpose:</strong>
|
||||
<dd>Determines whether a dataspace is a simple dataspace.
|
||||
<dt><strong>Description:</strong>
|
||||
<dd><code>H5Sis_simple</code> determines whether a dataspace is
|
||||
a simple dataspace. [Currently, all dataspace objects are simple
|
||||
dataspaces, complex dataspace support will be added in the future]
|
||||
<dt><strong>Parameters:</strong>
|
||||
<dl>
|
||||
<dt><em>hid_t</em> <code>space_id</code>
|
||||
<dd>Identifier of the dataspace to query
|
||||
</dl>
|
||||
<dt><strong>Returns:</strong>
|
||||
<dd>Returns TRUE or FALSE if Successful;
|
||||
otherwise FAIL (-1).
|
||||
</dl>
|
||||
|
||||
|
||||
<hr>
|
||||
<dl>
|
||||
<dt><strong>Name:</strong> <a name="Dataspace-GetClass">H5Sget_class</a>
|
||||
<dt><strong>Signature:</strong>
|
||||
<dd><em>H5S_class_t</em> <code>H5Sget_class</code>(<em>hid_t</em> <code>space_id</code>)
|
||||
<dt><strong>Purpose:</strong>
|
||||
<dd>Determine the current class of a dataspace.
|
||||
<dt><strong>Description:</strong>
|
||||
<dd><code>H5Sget_class</code> queries a dataspace to determine the
|
||||
current class of a dataspace.
|
||||
<p>
|
||||
The function returns a class name, one of the following:
|
||||
<code>H5S_SCALAR</code>,
|
||||
<code>H5S_SIMPLE</code>, or
|
||||
<code>H5S_NONE</code>.
|
||||
<dt><strong>Parameters:</strong>
|
||||
<dl>
|
||||
<dt><em>hid_t</em> <code>space_id</code>
|
||||
<dd>Dataspace identifier.
|
||||
</dl>
|
||||
<dt><strong>Returns:</strong>
|
||||
<dd>Returns a dataspace class name if successful;
|
||||
otherwise FAIL (-1).
|
||||
</dl>
|
||||
|
||||
|
||||
<hr>
|
||||
<dl>
|
||||
<dt><strong>Name:</strong> <a name="Dataspace-SelectHyperslab">H5Sselect_hyperslab</a>
|
||||
<dt><strong>Signature:</strong>
|
||||
<dd><em>herr_t</em> <code>H5Sselect_hyperslab</code>(<em>hid_t</em> <code>space_id</code>,
|
||||
<em>h5s_selopt_t</em><code>op</code>,
|
||||
<em>const hssize_t *</em><code>start</code>,
|
||||
<em>const hsize_t *</em><code>stride</code>
|
||||
<em>const hsize_t *</em><code>count</code>,
|
||||
<em>const hsize_t *</em><code>block</code>
|
||||
)
|
||||
<dt><strong>Purpose:</strong>
|
||||
<dd>Selects a hyperslab region to add to the current selected region.
|
||||
<dt><strong>Description:</strong>
|
||||
<dd><code>H5Sselect_hyperslab</code> selects a hyperslab region
|
||||
to add to the current selected region for the dataspace
|
||||
specified by <code>space_id</code>.
|
||||
<p>
|
||||
The <code>start</code>, <code>stride</code>, <code>count</code>,
|
||||
and <code>block</code> arrays must be the same size as the rank
|
||||
of the dataspace.
|
||||
<p>
|
||||
The selection operator <code>op</code> determines how the new
|
||||
selection is to be combined with the already existing selection
|
||||
for the dataspace.
|
||||
<p>
|
||||
Currently, only the <code>H5S_SELECT_SET</code> operator is
|
||||
supported; it replaces the existing selection with the
|
||||
parameters from this call. Overlapping blocks are not
|
||||
supported with the <code>H5S_SELECT_SET</code> operator.
|
||||
<P>
|
||||
The <code>start</code> array determines the starting coordinates
|
||||
of the hyperslab
|
||||
to select.
|
||||
<p>
|
||||
The <code>stride</code> array chooses array locations
|
||||
from the dataspace
|
||||
with each value in the <code>stride</code> array determining how
|
||||
many elements to move
|
||||
in each dimension. Setting a value in the <code>stride</code>
|
||||
array to 1 moves to
|
||||
each element in that dimension of the dataspace; setting a value of 2 in a
|
||||
location in the <code>stride</code> array moves to every other
|
||||
element in that
|
||||
dimension of the dataspace. In other words, the <code>stride</code>
|
||||
determines the
|
||||
number of elements to move from the <code>start</code> location
|
||||
in each dimension.
|
||||
Stride values of 0 are not allowed. If the <code>stride</code>
|
||||
parameter is <code>NULL</code>,
|
||||
a contiguous hyperslab is selected (as if each value in the
|
||||
<code>stride</code> array
|
||||
was set to all 1's).
|
||||
<p>
|
||||
The <code>count</code> array determines how many blocks to
|
||||
select from the dataspace, in each dimension.
|
||||
<p>
|
||||
The <code>block</code> array determines
|
||||
the size of the element block selected from the dataspace.
|
||||
If the <code>block</code>
|
||||
parameter is set to <code>NULL</code>, the block size defaults
|
||||
to a single element
|
||||
in each dimension (as if the <code>block</code> array was set to all 1's).
|
||||
<P>
|
||||
For example, in a 2-dimensional dataspace, setting
|
||||
<code>start</code> to [1,1],
|
||||
<code>stride</code> to [4,4], <code>count</code> to [3,7], and
|
||||
<code>block</code> to [2,2] selects
|
||||
21 2x2 blocks of array elements starting with location (1,1) and selecting
|
||||
blocks at locations (1,1), (5,1), (9,1), (1,5), (5,5), etc.
|
||||
<P>
|
||||
Regions selected with this function call default to C order iteration when
|
||||
I/O is performed.
|
||||
<dt><strong>Parameters:</strong>
|
||||
<dl>
|
||||
<dt><em>hid_t</em> <code>space_id</code>
|
||||
<dd>IN: Identifier of dataspace selection to modify
|
||||
<dt><em>H5S_seloper_t</em> <code>op</code>
|
||||
<dd>IN: Operation to perform on current selection.
|
||||
<dt><em>const hssize_t *</em><code>start</code>
|
||||
<dd>IN: Offset of start of hyperslab
|
||||
<dt><em>const hsize_t *</em><code>count</code>
|
||||
<dd>IN: Number of blocks included in hyperslab.
|
||||
<dt><em>const hsize_t *</em><code>stride</code>
|
||||
<dd>IN: Hyperslab stride.
|
||||
<dt><em>const hsize_t *</em><code>block</code>
|
||||
<dd>IN: Size of block in hyperslab.
|
||||
</dl>
|
||||
<dt><strong>Returns:</strong>
|
||||
<dd>Returns SUCCEED (0) if successful;
|
||||
otherwise FAIL (-1).
|
||||
</dl>
|
||||
|
||||
|
||||
<hr>
|
||||
<dl>
|
||||
<dt><strong>Name:</strong> <a name="Dataspace-Close">H5Sclose</a>
|
||||
<dt><strong>Signature:</strong>
|
||||
<dd><em>herr_t </em><code>H5Sclose</code>(<em>hid_t </em><code>space_id</code>
|
||||
)
|
||||
<dt><strong>Purpose:</strong>
|
||||
<dd>Releases and terminates access to a dataspace.
|
||||
<dt><strong>Description:</strong>
|
||||
<dd><code>H5Sclose</code> releases a dataspace.
|
||||
Further access through the dataspace identifier is illegal.
|
||||
Failure to release a dataspace with this call will
|
||||
result in resource leaks.
|
||||
<dt><strong>Parameters:</strong>
|
||||
<dl>
|
||||
<dt><em>hid_t</em> <code>space_id</code>
|
||||
<dd>Identifier of dataspace to release.
|
||||
</dl>
|
||||
<dt><strong>Returns:</strong>
|
||||
<dd>Returns SUCCEED (0) if successful;
|
||||
otherwise FAIL (-1).
|
||||
</dl>
|
||||
|
||||
|
||||
<hr>
|
||||
<center>
|
||||
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
|
||||
<a href="RM_H5.html">H5</a>
|
||||
<a href="RM_H5A.html">H5A</a>
|
||||
<a href="RM_H5D.html">H5D</a>
|
||||
<a href="RM_H5E.html">H5E</a>
|
||||
<a href="RM_H5F.html">H5F</a>
|
||||
<a href="RM_H5G.html">H5G</a>
|
||||
<a href="RM_H5P.html">H5P</a>
|
||||
H5S
|
||||
<a href="RM_H5T.html">H5T</a>
|
||||
<a href="RM_H5Z.html">H5Z</a>
|
||||
<a href="Glossary.html">Glossary</a>
|
||||
</center>
|
||||
<hr>
|
||||
|
||||
<address>
|
||||
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
|
||||
|
||||
<br>
|
||||
Last modified: 14 July 1998
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user