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-<HTML><HEAD>
-<TITLE>HDF5 Tutorial - Selecting Individual Points and Copying a Dataspace
-</TITLE>
-</HEAD>
-
-<body bgcolor="#ffffff">
-
-<!-- BEGIN MAIN BODY -->
-
-
- [ <A HREF="title.html"><I>HDF5 Tutorial Top</I></A> ]
-<H1>
-<BIG><BIG><BIG><FONT COLOR="#c101cd">Selecting Individual Points and Copying
-a Dataspace</FONT>
-</BIG></BIG></BIG></H1>
-
-<hr noshade size=1>
-
-<BODY>
-<H2>Contents:</H2>
-<UL>
- <LI> <A HREF="#def">Description</A>
- <LI> Programming Example
- <UL>
- <LI> <A HREF="#desc">Description</A>
- <LI> <A HREF="#rem">Remarks</A>
- <LI> <A HREF="#fc">File Contents</A>
- </UL>
-</UL>
-<HR>
-<A NAME="def">
-<H2>Description</h2>
-You can select independent points to read from or write to in a
-dataspace by use of the <CODE>H5Sselect_elements</CODE> /
-<CODE>h5sselect_elements_f</CODE> function.
-<P>
-The <CODE>H5Scopy</CODE> / <CODE>h5scopy_f</CODE> function allows
-you to make an exact copy of a dataspace.
-This can reduce the number of function calls needed when
-selecting a dataspace.
-<P>
-<H2> Programming Example</H2>
-
-<A NAME="desc">
-<H3><U>Description</U></H3>
-This example shows how to use <CODE>H5Sselect_elements</CODE> /
-<CODE>h5sselect_elements_f</CODE>
-to select individual points in a dataset and how to use
-<CODE>H5Scopy</CODE> / <CODE>h5scopy_f</CODE>
-to make a copy of a dataspace.
-<UL>
-[ <A HREF="examples/h5_copy.c">C example</A> ]
- - <code>h5_copy.c</code><BR>
-[ <A HREF="examples/selectele.f90">FORTRAN example</A> ]
- - <code>selectele.f90</code><BR>
-[ <A HREF="examples/java/Copy.java">Java example</A> ]
- - <code>Copy.java</code>
-</UL>
-<B>NOTE:</B> To download a tar file of the examples, including a Makefile,
-please go to the <A HREF="references.html">References</A> page.
-
-
-<A NAME="rem">
-<H3><U>Remarks</U></H3>
-<UL>
-<LI><CODE>H5Sselect_elements</CODE> / <CODE>h5sselect_elements_f</CODE>
-selects array elements to be
-included in the selection for a dataspace:
-<P>
-<I><B>C</B></I>:
-<pre>
- herr_t H5Sselect_elements (hid_t space_id, H5S_seloper_t operator,
- size_t num_elements,
- const hsize_t **coord )
-</pre>
-<P>
-<I><B>FORTRAN</B></I>:
-<pre>
- h5sselect_elements_f (space_id, operator, num_elements, coord, hdferr)
-
- space_id IN: INTEGER(HID_T)
- operator IN: INTEGER
- num_elements IN: INTEGER
- coord IN: INTEGER(HSIZE_T), DIMENSION(*,*)
- hdferr OUT: INTEGER
-</pre>
-<P>
-<UL>
-<LI>The <I>space_id</I> parameter is the dataspace identifier.
-<P>
-<LI>The <I>operator</I> parameter can be set to one of the following values:
-<dir><DL>
- <dt><CODE>H5S_SELECT_SET</CODE> (<CODE>H5S_SELECT_SET_F</CODE> in FORTRAN)
- <dd>Replace the existing selection with the parameters from this call.
- Overlapping blocks are not supported with this operator.
- <dt><CODE>H5S_SELECT_OR</CODE> (<CODE>H5S_SELECT_OR_F</CODE> in FORTRAN)
- <dd>Add the new selection to the existing selection.
-</DL></dir>
-<P>
-<LI>The <I>coord</I> array is a two-dimensional array of size
-<code><em>NUMP</em> x <em>RANK</em></code> in C
-(<code><em>RANK</em> x <em>NUMP</em></code> in FORTRAN)
-where <code><em>NUMP</em></code> is the number of selected points
-and <code><em>RANK</em></code> is the rank of the dataset.
-Note that these coordinates are 0-based in C and 1-based in FORTRAN.
-<p>
- Consider the non-zero elements of the following array:
- <pre>
- 0 59 0 53
- 0 0 0 0
- 0 0 1 0 </pre>
- In C, the <em>coord</em> array selecting these points would be as follows:
- <pre>
- 0 1
- 0 3
- 2 2 </pre>
- While in FORTRAN, the <em>coord</em> array would be as follows:
- <pre>
- 1 1 3
- 2 4 3 </pre>
-<P>
-<LI>In C, this function returns a non-negative value if successful and
-a negative value otherwise. In FORTRAN, the value returned in <I>hdferr</I>
-indicates whether it was successful (0) or not (-1).
-</UL>
-<P>
-<LI><CODE>H5Scopy</CODE> / <CODE>h5scopy_f</CODE> creates an exact copy of a dataspace:
-<P>
-<I><B>C</B></I>:
-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
-<PRE>
- hid_t H5Scopy (hid_t space_id)
-</PRE>
-<I><B>FORTRAN</B></I>: &nbsp;
-<PRE>
- h5scopy_f (space_id, new_space_id, hdferr)
-
- space_id IN: INTEGER(HID_T)
- new_space_id OUT: INTEGER(HID_T)
- hdferr OUT: INTEGER
-</PRE>
-<P>
-<UL>
-<LI>The <I>space_id</I> parameter is the dataspace identifier to copy.
-<P>
-<LI>In C, the identifier to the dataspace's copy is returned if the
-function is successful and a negative value is returned if not. In
-FORTRAN, the new dataspace identifier is returned in <I>new_space_id</I>
-and the return value is returned in <I>hdferr</I> ( 0 if successful and
--1 if not).
-</UL>
-</UL>
-</UL>
-<P>
-
-<A NAME="fc">
-<H3><U>File Contents</U></H3>
-
-Following is the DDL for <I>copy1.h5</I> and <I>copy2.h5</I>, as viewed with
-the following commands:<br>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-<code>h5dump copy1.h5</code> <br>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-<code>h5dump copy2.h5</code>
-
-<P>
-<HR>
-<B><I><U>C</U></B></I>:<P>
-<B>Fig. S.1a</B> &nbsp; <I><code>copy1.h5</code> in DDL</I>
-<PRE>
- HDF5 "copy1.h5" {
- GROUP "/" {
- DATASET "Copy1" {
- DATATYPE { H5T_STD_I32BE }
- DATASPACE { SIMPLE ( 3, 4 ) / ( 3, 4 ) }
- DATA {
- 0, 59, 0, 53,
- 0, 0, 0, 0,
- 0, 0, 0, 0
- }
- }
- }
- }
-</PRE>
-<B>Fig. S.1b</B> &nbsp; <I><code>copy2.h5</code> in DDL</I>
-<PRE>
- HDF5 "copy2.h5" {
- GROUP "/" {
- DATASET "Copy2" {
- DATATYPE { H5T_STD_I32BE }
- DATASPACE { SIMPLE ( 3, 4 ) / ( 3, 4 ) }
- DATA {
- 1, 59, 1, 53,
- 1, 1, 1, 1,
- 1, 1, 1, 1
- }
- }
- }
- }
-</PRE>
-<HR>
-<I><B><U>FORTRAN</U></B></I>:<P>
-<B>Fig. S.2a</B> &nbsp; <I><code>copy1.h5</code> in DDL</I>
-<PRE>
- HDF5 "copy1.h5" {
- GROUP "/" {
- DATASET "Copy1" {
- DATATYPE { H5T_STD_I32BE }
- DATASPACE { SIMPLE ( 4, 3 ) / ( 4, 3 ) }
- DATA {
- 0, 0, 0,
- 53, 0, 0,
- 0, 0, 0,
- 59, 0, 0
- }
- }
- }
- }
-</PRE>
-<B>Fig. S.2b</B> &nbsp; <I><code>copy2.h5</code> in DDL</I>
-<PRE>
- HDF5 "copy2.h5" {
- GROUP "/" {
- DATASET "Copy2" {
- DATATYPE { H5T_STD_I32BE }
- DATASPACE { SIMPLE ( 4, 3 ) / ( 4, 3 ) }
- DATA {
- 1, 1, 1,
- 53, 1, 1,
- 1, 1, 1,
- 59, 1, 1
- }
- }
- }
- }
-</PRE>
-
-
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-
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-<font face="arial,helvetica" size="-1">
- <a href="http://www.ncsa.uiuc.edu/"><img border=0
- src="footer-ncsalogo.gif"
- width=78 height=27 alt="NCSA"><br>
- The National Center for Supercomputing Applications</A><br>
- <a href="http://www.uiuc.edu/">University of Illinois
- at Urbana-Champaign</a><br>
- <br>
-<!-- <A HREF="helpdesk.mail.html"> -->
-<A HREF="mailto:hdfhelp@ncsa.uiuc.edu">
-hdfhelp@ncsa.uiuc.edu</A>
-<br>
-<BR> <H6>Last Modified: June 22, 2001</H6><BR>
-<!-- modified by Barbara Jones - bljones@ncsa.uiuc.edu -->
-<!-- modified by Frank Baker - fbaker@ncsa.uiuc.edu -->
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