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<div class="headertitle"><div class="title">Creating Datasets in Groups</div></div>
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<div class="textblock"><p>Navigate back: <a class="el" href="index.html">Main</a> / <a class="el" href="_getting_started.html">Getting Started with HDF5</a> / <a class="el" href="_learn_basics.html">Learning the Basics</a> </p><hr />
<h1><a class="anchor" id="secLBGrpDset"></a>
Datasets in Groups</h1>
<p>We have shown how to create groups, datasets, and attributes. In this section, we show how to create datasets in groups. Recall that <a class="el" href="group___h5_d.html#ga0647ba4bbd26d5230cc07f3a5685b2cf">H5Dcreate</a> creates a dataset at the location specified by a location identifier and a name. Similar to <a class="el" href="group___h5_g.html#ga187cee27a9fc4f1a311eb19b0522c7b8">H5Gcreate</a>, the location identifier can be a file identifier or a group identifier and the name can be relative or absolute. The location identifier and the name together determine the location where the dataset is to be created. If the location identifier and name refer to a group, then the dataset is created in that group.</p>
<h1><a class="anchor" id="secLBGrpDsetEx"></a>
Programming Example</h1>
<h2><a class="anchor" id="secLBGrpDsetExDesc"></a>
Description</h2>
<p>See <a class="el" href="_l_b_examples.html">Examples from Learning the Basics</a> for the examples used in the <a class="el" href="_learn_basics.html">Learning the Basics</a> tutorial.</p>
<p>The example shows how to create a dataset in a particular group. It opens the file created in the previous example and creates two datasets:</p>
<p>For details on compiling an HDF5 application: [ <a class="el" href="_l_b_compiling.html">Compiling HDF5 Applications</a> ]</p>
<h2><a class="anchor" id="secLBGrpDsetExCont"></a>
File Contents</h2>
<p>Shown below is the contents and the definition of the group of <code style="background-color:whitesmoke;">groups.h5</code> (created by the C program). (The FORTRAN program creates the HDF5 file <code style="background-color:whitesmoke;">groupsf.h5</code> and the resulting DDL shows the filename <code style="background-color:whitesmoke;">groupsf.h5</code> in the first line.) </p><table class="doxtable">
<caption>The contents of the file groups.h5 (groupsf.h5 for FORTRAN)</caption>
<tr>
<td><div class="image">
<img src="imggrpdsets.gif" alt=""/>
</div>
</td></tr>
</table>
<p><em>groups.h5 in DDL</em> </p><div class="fragment"><div class="line">HDF5 <span class="stringliteral">"groups.h5"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"/"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"MyGroup"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"Group_A"</span> {</div>
<div class="line"> DATASET <span class="stringliteral">"dset2"</span> {</div>
<div class="line"> DATATYPE { <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a> }</div>
<div class="line"> DATASPACE { SIMPLE ( 2, 10 ) / ( 2, 10 ) }</div>
<div class="line"> DATA {</div>
<div class="line"> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,</div>
<div class="line"> 1, 2, 3, 4, 5, 6, 7, 8, 9, 10</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line">GROUP <span class="stringliteral">"Group_B"</span> {</div>
<div class="line">}</div>
<div class="line">DATASET <span class="stringliteral">"dset1"</span> {</div>
<div class="line"> DATATYPE { <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a> }</div>
<div class="line"> DATASPACE { SIMPLE ( 3, 3 ) / ( 3, 3 ) }</div>
<div class="line"> DATA {</div>
<div class="line"> 1, 2, 3,</div>
<div class="line"> 1, 2, 3,</div>
<div class="line"> 1, 2, 3</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line">}</div>
<div class="line">}</div>
<div class="line">}</div>
<div class="ttc" id="agroup___p_d_t_s_t_d_html_ga37e8a6be7ee64587c2a282b965019bb8"><div class="ttname"><a href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a></div><div class="ttdeci">#define H5T_STD_I32BE</div><div class="ttdef"><b>Definition</b> H5Tpublic.h:305</div></div>
</div><!-- fragment --><p><em>groupsf.h5 in DDL</em> </p><div class="fragment"><div class="line">HDF5 <span class="stringliteral">"groupsf.h5"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"/"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"MyGroup"</span> {</div>
<div class="line">GROUP <span class="stringliteral">"Group_A"</span> {</div>
<div class="line"> DATASET <span class="stringliteral">"dset2"</span> {</div>
<div class="line"> DATATYPE { <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a> }</div>
<div class="line"> DATASPACE { SIMPLE ( 10, 2 ) / ( 10, 2 ) }</div>
<div class="line"> DATA {</div>
<div class="line"> 1, 1,</div>
<div class="line"> 2, 2,</div>
<div class="line"> 3, 3,</div>
<div class="line"> 4, 4,</div>
<div class="line"> 5, 5,</div>
<div class="line"> 6, 6,</div>
<div class="line"> 7, 7,</div>
<div class="line"> 8, 8,</div>
<div class="line"> 9, 9,</div>
<div class="line"> 10, 10</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line">GROUP <span class="stringliteral">"Group_B"</span> {</div>
<div class="line">}</div>
<div class="line">DATASET <span class="stringliteral">"dset1"</span> {</div>
<div class="line"> DATATYPE { <a class="code hl_define" href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a> }</div>
<div class="line"> DATASPACE { SIMPLE ( 3, 3 ) / ( 3, 3 ) }</div>
<div class="line"> DATA {</div>
<div class="line"> 1, 1, 1,</div>
<div class="line"> 2, 2, 2,</div>
<div class="line"> 3, 3, 3</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line">}</div>
<div class="line">}</div>
<div class="line">}</div>
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