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<div id="content">
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org37a54d0">1. Text back end</a></li>
<li><a href="#org179d7bd">2. HDF5 Back end</a></li>
</ul>
</div>
</div>
<p>
See templator<sub>front.org</sub>
</p>
<div id="outline-container-org37a54d0" class="outline-2">
<h2 id="org37a54d0"><span class="section-number-2">1</span> Text back end</h2>
<div class="outline-text-2" id="text-1">
<p>
As the size of the dataset should be extensible, the simplest
solution is to use one file for each sparse data set, and store a
the name of this file in the group.
Each integral can be a line in the file:
i j k l x
which can be read with "%10ld %10ld %10ld %10ld %24.16e".
The offset can be used with <code>fseek(69L*offset, SEEK_SET)</code>
</p>
</div>
</div>
<div id="outline-container-org179d7bd" class="outline-2">
<h2 id="org179d7bd"><span class="section-number-2">2</span> HDF5 Back end</h2>
<div class="outline-text-2" id="text-2">
<p>
We need to declare the number of rows of the dataset as
<code>UNLIMITED</code>. This requires to use the <code>Chunked</code> storage, and the
chunks should absolutely not be larger than 1MB.
</p>
<p>
To extend the storage, see :
<a href="https://support.hdfgroup.org/HDF5/doc1.6/UG/10_Datasets.html">https://support.hdfgroup.org/HDF5/doc1.6/UG/10_Datasets.html</a>
(figure 17)
</p>
<p>
If the offset+num &gt; nmax, we need to extend the dataset.
</p>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="date">Created: 2021-11-08 Mon 19:09</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
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