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<li class="toctree-l2"><a class="reference internal" href="#dimension-types">Dimension types</a></li>
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<div class="section" id="matlab-interface">
<h1>MATLAB interface</h1>
<p>The Matrix Laboratory (MATLAB) interface consists of a series of M-files
that provide the <cite>harp_import</cite>, <cite>harp_export</cite> and <cite>harp_version</cite> functions.</p>
<p>Products are represented in MATLAB as structures which can be manipulated freely
from within MATLAB. A product structure contains an array field for each variable
contained in the product.</p>
<p>Products can be exported as HARP compliant products in any of the file formats
supported by the HARP C library (netCDF/HDF4/HDF5). Such exported products can
subsequently be processed further using the <a class="reference internal" href="tools.html"><span class="doc">HARP command line tools</span></a>.</p>
<div class="section" id="dimension-types">
<h2>Dimension types</h2>
<p>The HARP C library defines several dimension types (time, vertical, latitude
etc.). This information is stored in the dimension_type field of each variable
in MATLAB. If a variable is a scalar (which has no dimensions), the dimension_type
field is not present.</p>
</div>
<div class="section" id="data-types">
<h2>Data types</h2>
<p>The HARP MATLAB interface takes care of the conversion of product and variables
from the C domain to the MATLAB domain and back. This section describes the
relation between types in the C domain and types in the MATLAB domain.</p>
<p>The table below shows the type map that is used when importing or ingesting a
product, i.e. when translating from the C domain to the MATLAB domain.</p>
<p>Variable data arrays are converted to arrays in the product structure. The data
type used for the converted array is determined from the HARP data type of the
variable according to the type map shown below. Zero-dimensional arrays of
length 1 are converted to MATLAB arrays of 1x1. The resulting MATLAB type is also
shown in the type map.</p>
<table border="1" class="docutils">
<colgroup>
<col width="58%" />
<col width="42%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">HARP data type</th>
<th class="head">MATLAB type</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>harp_type_int8</td>
<td>int8</td>
</tr>
<tr class="row-odd"><td>harp_type_int16</td>
<td>int16</td>
</tr>
<tr class="row-even"><td>harp_type_int32</td>
<td>int32</td>
</tr>
<tr class="row-odd"><td>harp_type_float</td>
<td>single</td>
</tr>
<tr class="row-even"><td>harp_type_double</td>
<td>double</td>
</tr>
<tr class="row-odd"><td>harp_type_string</td>
<td>char</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="unicode">
<h2>Unicode</h2>
<p>Zero-terminated C strings received from the HARP C library are always converted
to arrays of mxCHAR in MATLAB which is an unicode string.</p>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-MATLAB notranslate"><div class="highlight"><pre><span></span><span class="p">;</span> <span class="n">Ingest</span> <span class="n">a</span> <span class="n">file</span> <span class="n">and</span> <span class="n">convert</span> <span class="n">it</span> <span class="n">to</span> <span class="n">a</span> <span class="n">HARP</span> <span class="n">product</span> <span class="p">(</span><span class="n">the</span>
<span class="p">;</span> <span class="n">file</span> <span class="n">that</span> <span class="n">is</span> <span class="n">used</span> <span class="n">in</span> <span class="n">this</span> <span class="n">example</span> <span class="n">is</span> <span class="n">an</span> <span class="n">ACE</span><span class="o">-</span><span class="n">FTS</span> <span class="n">file</span><span class="p">).</span>
<span class="n">product1</span> <span class="p">=</span> <span class="n">harp_import</span><span class="p">(</span>"<span class="n">ss13799</span><span class="p">.</span><span class="n">asc</span>"<span class="p">)</span>
<span class="p">;</span> <span class="n">Print</span> <span class="n">information</span> <span class="n">about</span> <span class="n">the</span> <span class="n">product</span><span class="p">.</span>
<span class="nb">disp</span><span class="p">(</span><span class="n">product1</span><span class="p">)</span>
<span class="p">;</span> <span class="n">Print</span> <span class="n">information</span> <span class="n">about</span> <span class="n">the</span> <span class="n">variable</span> <span class="s">'temperature'</span><span class="p">.</span>
<span class="nb">disp</span><span class="p">(</span><span class="n">product1</span><span class="p">.</span><span class="n">temperature</span><span class="p">)</span>
<span class="p">;</span> <span class="n">Print</span> <span class="n">the</span> <span class="n">contents</span> <span class="n">of</span> <span class="n">the</span> <span class="n">variable</span> <span class="s">'temperature'</span><span class="p">.</span>
<span class="n">product1</span><span class="p">.</span><span class="n">temperature</span><span class="p">.</span><span class="n">value</span>
<span class="p">;</span> <span class="n">Export</span> <span class="n">the</span> <span class="n">updated</span> <span class="n">product</span> <span class="n">as</span> <span class="n">an</span> <span class="n">HDF4</span> <span class="n">file</span> <span class="p">(</span><span class="n">the</span> <span class="n">format</span> <span class="n">must</span> <span class="n">be</span>
<span class="p">;</span> <span class="n">HDF4</span><span class="p">,</span> <span class="n">HDF5</span> <span class="n">or</span> <span class="n">netCDF</span><span class="p">,</span> <span class="k">if</span> <span class="n">no</span> <span class="n">format</span> <span class="n">is</span> <span class="n">specified</span> <span class="n">netCDF</span> <span class="n">is</span> <span class="n">used</span><span class="p">).</span>
<span class="n">result</span> <span class="p">=</span> <span class="n">harp_export</span><span class="p">(</span><span class="n">product1</span><span class="p">,</span> "<span class="n">ace_fts_ss13799</span><span class="p">.</span><span class="n">hdf</span>"<span class="p">,</span> "<span class="n">hdf4</span>"<span class="p">)</span>
<span class="p">;</span> <span class="n">Print</span> <span class="n">the</span> <span class="n">result</span> <span class="n">of</span> <span class="n">the</span> <span class="n">export</span><span class="p">.</span>
<span class="nb">disp</span><span class="p">(</span><span class="n">result</span><span class="p">)</span>
<span class="p">;</span> <span class="n">Import</span> <span class="n">the</span> <span class="n">HDF4</span> <span class="n">file</span> <span class="n">and</span> <span class="n">perform</span> <span class="n">an</span> <span class="n">operation</span> <span class="n">to</span> <span class="n">exclude</span> <span class="n">the</span> <span class="n">variable</span>
<span class="p">;</span> <span class="n">temperature</span> <span class="p">(</span><span class="n">variable</span> <span class="n">name</span> <span class="n">must</span> <span class="n">be</span> <span class="n">in</span> <span class="n">uppercase</span><span class="p">).</span>
<span class="n">product2</span> <span class="p">=</span> <span class="n">harp_import</span><span class="p">(</span>"<span class="n">ace_fts_ss13799</span><span class="p">.</span><span class="n">hdf</span>"<span class="p">,</span> "<span class="n">exclude</span><span class="p">(</span><span class="n">TEMPERATURE</span><span class="p">)</span>"<span class="p">);</span>
<span class="p">;</span> <span class="n">Print</span> <span class="n">information</span> <span class="n">about</span> <span class="n">the</span> <span class="n">product</span><span class="p">.</span>
<span class="nb">disp</span><span class="p">(</span><span class="n">product2</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="api-reference">
<h2>API reference</h2>
<p>This section describes the functions defined by the HARP MATLAB interface.</p>
<dl class="function">
<dt>
<code class="descname">harp_import</code><span class="sig-paren">(</span><em>filename</em>, <em>operations=''</em>, <em>options=''</em><span class="sig-paren">)</span></dt>
<dd><p>Import a product from a file.</p>
<p>This will first try to import the file as an HDF4, HDF5, or netCDF file that
complies to the HARP Data Format. If the file is not stored using the HARP
format then it will try to import it using one of the available ingestion
modules.</p>
<p>If the filename argument is a list of filenames or a globbing (glob.glob())
pattern then the harp.import_product() function will be called on each
individual file and the result of harp.concatenate() on the imported products
will be returned.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>filename</strong> (<em>str</em>) – Filename of the product to ingest</li>
<li><strong>operations</strong> (<em>str</em>) – Actions to apply as part of the import; should be
specified as a semi-colon separated string of operations.</li>
<li><strong>options</strong> (<em>str</em>) – Ingestion module specific options; should be specified as
a semi-colon separated string of key=value pairs; only
used if the file is not in HARP format.</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Ingested product.</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt>
<code class="descname">harp_export</code><span class="sig-paren">(</span><em>product</em>, <em>filename</em>, <em>file_format='netcdf'</em><span class="sig-paren">)</span></dt>
<dd><p>Export a HARP compliant product.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>product</strong> (<em>str</em>) – Product to export.</li>
<li><strong>filename</strong> (<em>str</em>) – Filename of the exported product.</li>
<li><strong>file_format</strong> (<em>str</em>) – File format to use; one of ‘netcdf’, ‘hdf4’, or
‘hdf5’. If no format is specified, netcdf is used.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="function">
<dt>
<code class="descname">harp_version</code><span class="sig-paren">(</span><span class="sig-paren">)</span></dt>
<dd><p>Returns the version number of HARP.</p>
</dd></dl>
</div>
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