2021-06-18 12:05:06 +02:00
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2021-10-01 10:49:29 +02:00
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2021-06-18 12:05:06 +02:00
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</head>
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<body>
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<div id="content">
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<div id="table-of-contents">
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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2021-10-01 10:49:29 +02:00
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<li><a href="#org014fdde">1. Text back end</a></li>
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<li><a href="#org3e11b99">2. HDF5 Back end</a></li>
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2021-06-18 12:05:06 +02:00
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</ul>
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</div>
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</div>
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<p>
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See templator<sub>front.org</sub>
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</p>
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2021-10-01 10:49:29 +02:00
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<div id="outline-container-org014fdde" class="outline-2">
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<h2 id="org014fdde"><span class="section-number-2">1</span> Text back end</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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As the size of the dataset should be extensible, the simplest
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solution is to use one file for each sparse data set, and store a
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the name of this file in the group.
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Each integral can be a line in the file:
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i j k l x
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which can be read with "%10ld %10ld %10ld %10ld %24.16e".
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The offset can be used with <code>fseek(69L*offset, SEEK_SET)</code>
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</p>
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</div>
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</div>
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2021-10-01 10:49:29 +02:00
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<div id="outline-container-org3e11b99" class="outline-2">
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<h2 id="org3e11b99"><span class="section-number-2">2</span> HDF5 Back end</h2>
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<div class="outline-text-2" id="text-2">
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<p>
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We need to declare the number of rows of the dataset as
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<code>UNLIMITED</code>. This requires to use the <code>Chunked</code> storage, and the
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chunks should absolutely not be larger than 1MB.
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</p>
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<p>
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To extend the storage, see :
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<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>
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(figure 17)
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</p>
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<p>
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If the offset+num > nmax, we need to extend the dataset.
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</p>
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</div>
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</div>
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</div>
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<div id="postamble" class="status">
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2021-10-01 10:49:29 +02:00
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<p class="date">Created: 2021-10-01 Fri 08:49</p>
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2021-06-18 12:05:06 +02:00
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<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
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