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| author | Frank Baker <fbaker@hdfgroup.org> | 1998-07-15 04:51:50 (GMT) |
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| committer | Frank Baker <fbaker@hdfgroup.org> | 1998-07-15 04:51:50 (GMT) |
| commit | c8e75d27b018deb862171a153dd640455dbe26fb (patch) | |
| tree | 0056588a00653bd4f6fff761482837baa9396a11 /doc/html/RM_H5S.html | |
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[svn-r503] HDF5 Reference Manual
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diff --git a/doc/html/RM_H5S.html b/doc/html/RM_H5S.html new file mode 100644 index 0000000..6230e56 --- /dev/null +++ b/doc/html/RM_H5S.html @@ -0,0 +1,529 @@ +<html> +<head><title> +HDF5/H5S Draft API Specification +</title></head> + +<body> + +<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> + +<center> +<h1>H5S: Dataspace Interface</h1> +</center> + +<h2>Dataspace Object API Functions</h2> + +These functions create and manipulate the dataspace in which to store the +elements of a dataset. + +<table border=0> +<tr><td valign=top> +<ul> + <li><a href="#Dataspace-Create">H5Screate</a> + <li><a href="#Dataspace-CreateSimple">H5Screate_simple</a> + <li><a href="#Dataspace-Copy">H5Scopy</a> + <li><a href="#Dataspace-SelectNpoints">H5Sselect_npoints</a> + <li><a href="#Dataspace-SelectElements">H5Sselect_elements</a> +</ul> +</td><td> </td><td valign=top> +<ul> + <li><a href="#Dataspace-ExtentNpoints">H5Sextent_npoints</a> + <li><a href="#Dataspace-ExtentNdims">H5Sextent_ndims</a> + <li><a href="#Dataspace-ExtentDims">H5Sextent_dims</a> + <li><a href="#Dataspace-GetClass">H5Sget_class</a> +</ul> +</td><td> </td><td valign=top> +<ul> + <li><a href="#Dataspace-SetExtentSimple">H5Sset_extent_simple</a> + <li><a href="#Dataspace-IsSimple">H5Sis_simple</a> + <li><a href="#Dataspace-SelectHyperslab">H5Sselect_hyperslab</a> + <li><a href="#Dataspace-Close">H5Sclose</a> +</ul> +</td></tr> +</table> + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-Create">H5Screate</a> +<dt><strong>Signature:</strong> + <dd><em>hid_t</em> <code>H5Screate</code>(<em>H5S_class_t</em> <code>type</code>) +<dt><strong>Purpose:</strong> + <dd>Creates a new dataspace of a specified type. +<dt><strong>Description:</strong> + <dd><code>H5Screate</code> creates a new dataspace of a particular + <code>type</code>. + The types currently supported are <code>H5S_SCALAR</code>, + <code>H5S_SIMPLE</code>, and <code>H5S_NONE</code>; + others are planned to be added later. The <code>H5S_NONE</code> + dataspace can only hold a selection, not an extent. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>H5S_class_t</em> <code>type</code> + <dd>The type of dataspace to be created. + </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-CreateSimple">H5Screate_simple</a> +<dt><strong>Signature:</strong> + <dd><em>hid_t</em> <code>H5Screate_simple</code>(<em>int</em> <code>rank</code>, + <em>const hsize_t *</em> <code>dims</code>, + <em>const hsize_t *</em> <code>maxdims</code> + ) +<dt><strong>Purpose:</strong> + <dd>Creates a new simple data space and opens it for access. +<dt><strong>Description:</strong> + <dd><code>H5Screate_simple</code> creates a new simple data space + and opens it for access. The <code>rank</code> is the number of + dimensions used in the dataspace. + The <code>dims</code> argument is the size + of the simple dataset and the <code>maxdims</code> argument is + the upper limit on the size of the dataset. <code>maxdims</code> + may be the null pointer in which case the upper limit is the + same as <code>dims</code>. If an element of <code>maxdims</code> + is zero then the corresponding dimension is unlimited, otherwise + no element of <code>maxdims</code> should be smaller than the + corresponding element of <code>dims</code>. The dataspace + identifier returned from this function should be released with + <code>H5Sclose</code> or resource leaks will occur. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>int</em> <code>rank</code> + <dd>Number of dimensions of dataspace. + <dt><em>const hsize_t *</em> <code>dims</code> + <dd>An array of the size of each dimension. + <dt><em>const hsize_t *</em> <code>maxdims</code> + <dd>An array of the maximum size of each dimension. + </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-Copy">H5Scopy</a> +<dt><strong>Signature:</strong> + <dd><em>hid_t </em><code>H5Scopy</code>(<em>hid_t </em><code>space_id</code> + ) +<dt><strong>Purpose:</strong> + <dd>Creates an exact copy of a dataspace. +<dt><strong>Description:</strong> + <dd><code>H5Scopy</code> creates a new dataspace which is an exact + copy of the dataspace identified by <code>space_id</code>. + The dataspace identifier returned from this function should be + released with <code>H5Sclose</code> or resource leaks will occur. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>space_id</code> + <dd>Identifier of dataspace to copy. + </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-SelectElements">H5Sselect_elements</a> +<dt><strong>Signature:</strong> + <dd><em>herr_t</em> <code>H5Sselect_elements</code>(<em>hid_t </em><code>space_id</code>, + <em>dh5s_selopt_t</em> <code>op</code>, + <em>const size_t</em> <code>num_elements</code>, + <em>const hssize_t *</em><code>coord</code>[ ] + ) +<dt><strong>Purpose:</strong> + <dd>Selects array elements to be included in the selection for a dataspace. +<dt><strong>Description:</strong> + <dd><code>H5Sselect_elements</code> selects array elements to be + included in the selection for the <code>space_id</code> + dataspace. The number of elements selected must be set with + the <code>num_elements</code>. The <code>coord</code> array + is a two-dimensional array of size <em>dataspace rank</em> + by <code>num_elements</code> (ie. a list of coordinates in + the array). The order of the element coordinates in the + <code>coord</code> array also specifies the order in which + the array elements are iterated through when I/O is performed. + Duplicate coordinate locations are not checked for. + <P> + The selection operator <code>op</code> determines how the + new selection is to be combined with the previously existing + selection for the dataspace. Currently, only the + <code>H5S_SELECT_SET</code> operator is supported, which + replaces the existing selection with the parameters from + this call. When operators other than <code>H5S_SELECT_SET</code> + are used to combine a new selection with an existing selection, + the selection ordering is reset to 'C' array ordering. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>space_id</code> + <dd>Identifier of the dataspace. + <dt><em>dh5s_selopt_t</em> <code>op</code> + <dd>operator specifying how the new selection is to be + combined with the existing selection for the dataspace. + <dt><em>const size_t</em> <code>num_elements</code> + <dd>Number of elements to be selected. + <dt><em>const hssize_t *</em><code>coord</code>[ ] + <dd>A 2-dimensional array specifying the coordinates of the + elements being selected. + </dl> +<dt><strong>Returns:</strong> + <dd>Returns SUCCEED (0) if successful; + otherwise FAIL (-1). +</dl> + + + + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-ExtentNpoints">H5Sextent_npoints</a> +<dt><strong>Signature:</strong> + <dd><em>hsize_t</em> <code>H5Sextent_npoints</code>(<em>hid_t </em><code>space_id</code>) +<dt><strong>Purpose:</strong> + <dd>Determines the number of elements in a dataspace. +<dt><strong>Description:</strong> + <dd><code>H5Sextent_npoints</code> determines the number of elements + in a dataspace. For example, a simple 3-dimensional dataspace + with dimensions 2, 3, and 4 would have 24 elements. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>space_id</code> + <dd>ID of the dataspace object to query + </dl> +<dt><strong>Returns:</strong> + <dd>Returns the number of elements in the dataspace if successful; + otherwise returns 0. +</dl> + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-SelectNpoints">H5Sselect_npoints</a> +<dt><strong>Signature:</strong> + <dd><em>hsize_t</em> <code>H5Sselect_npoints</code>(<em>hid_t</em> <code>space_id</code>) +<dt><strong>Purpose:</strong> + <dd>Determines the number of elements in a dataspace. +<dt><strong>Description:</strong> + <dd><code>H5Sselect_npoints</code> determines the number of elements + in the current selection of a dataspace. +<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 identifier if successful; + otherwise FAIL (-1). +</dl> + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-ExtentNdims">H5Sextent_ndims</a> +<dt><strong>Signature:</strong> + <dd><em>int</em> <code>H5Sextent_ndims</code>(<em>hid_t</em> <code>space_id</code>) +<dt><strong>Purpose:</strong> + <dd>Determines the dimensionality of a dataspace. +<dt><strong>Description:</strong> + <dd><code>H5Sextent_ndims</code> determines the dimensionality (or rank) + of a dataspace. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>space_id</code> + <dd>Identifier of the dataspace + </dl> +<dt><strong>Returns:</strong> + <dd>Returns the number of dimensions in the dataspace if successful; + otherwise FAIL (-1) +</dl> + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-ExtentDims">H5Sextent_dims</a> +<dt><strong>Signature:</strong> + <dd><em>int</em> <code>H5Sextent_dims</code>(<em>hid_t</em> <code>space_id</code>, + <em>hsize_t *</em><code>dims</code>, + <em>hsize_t *</em><code>maxdims</code> + ) +<dt><strong>Purpose:</strong> + <dd>Retrieves dataspace dimension size and maximum size. +<dt><strong>Description:</strong> + <dd><code>H5Sextent_dims</code> returns the size and maximum sizes + of each dimension of a dataspace through the <code>dims</code> + and <code>maxdims</code> parameters. +<dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>space_id</code> + <dd>IN: Identifier of the dataspace object to query + <dt><em>hsize_t *</em><code>dims</code> + <dd>OUT: Pointer to array to store the size of each dimension. + <dt><em>hsize_t *</em><code>maxdims</code> + <dd>OUT: Pointer to array to store the maximum size of each dimension. + </dl> +<dt><strong>Returns:</strong> + <dd>Returns the number of dimensions in the dataspace if successful; + otherwise FAIL (-1). +</dl> + + +<hr> +<dl> +<dt><strong>Name:</strong> <a name="Dataspace-SetExtentSimple">H5Sset_extent_simple</a> +<dt><strong>Signature:</strong> + <dd><em>herr_t</em> <code>H5S_set_extent_simple</code>(<em>hid_t</em> <code>space_id</code>, + <em>int</em> <code>rank</code>, + <em>const hsize_t *</em><code>current_size</code>, + <em>const hsize_t *</em><code>maximum_size</code> + ) +<dt><strong>Purpose:</strong> + <dd>Sets or resets the size of an existing dataspace. +<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> |