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286 lines
10 KiB
HTML
286 lines
10 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
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#org-div-home-and-up
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/*]]>*/-->
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</style>
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<script type="text/javascript">
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/*
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@licstart The following is the entire license notice for the
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JavaScript code in this tag.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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The JavaScript code in this tag is free software: you can
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redistribute it and/or modify it under the terms of the GNU
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General Public License (GNU GPL) as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version. The code is distributed WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
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As additional permission under GNU GPL version 3 section 7, you
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may distribute non-source (e.g., minimized or compacted) forms of
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that code without the copy of the GNU GPL normally required by
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section 4, provided you include this license notice and a URL
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through which recipients can access the Corresponding Source.
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@licend The above is the entire license notice
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for the JavaScript code in this tag.
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*/
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<!--/*--><![CDATA[/*><!--*/
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function CodeHighlightOn(elem, id)
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/*]]>*///-->
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</script>
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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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<li><a href="#org499f156">1. Text back end</a></li>
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<li><a href="#orgb4737fc">2. HDF5 Back end</a></li>
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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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<div id="outline-container-org499f156" class="outline-2">
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<h2 id="org499f156"><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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<div id="outline-container-orgb4737fc" class="outline-2">
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<h2 id="orgb4737fc"><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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<p class="date">Created: 2021-10-07 Thu 07:56</p>
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<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
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</div>
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</body>
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</html>
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