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<h4 class="subsectionHead"><span class="titlemark">9.1 </span> <a
id="x92-1290009.1"></a> hb_read &#8212; Read a sparse matrix from a file in the Harwell&#8211;Boeing
format</h4>
<!--l. 16-->
<div class="lstlisting" id="listing-10"><span class="label"><a
id="x92-129001r1"></a></span><span
class="cmtt-10">call</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">hb_read</span><span
class="cmtt-10">(</span><span
class="cmtt-10">a</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">iret</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">iunit</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">filename</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">b</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">mtitle</span><span
class="cmtt-10">)</span>
</div>
<!--l. 20--><p class="indent" >
<dl class="description"><dt class="description">
<span
class="cmbx-10">Type:</span> </dt><dd
class="description">Asynchronous.
</dd><dt class="description">
<span
class="cmbx-10">On Entry</span> </dt><dd
class="description">
</dd><dt class="description">
<span
class="cmbx-10">filename</span> </dt><dd
class="description">The name of the file to be read.<br
class="newline" />Type:<span
class="cmbx-10">optional</span>.<br
class="newline" />Specified as: a character variable containing a valid file name, or <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">-</span></span></span>, in
which case the default input unit 5 (i.e. standard input in Unix jargon) is
used. Default: <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">-</span></span></span>.
</dd><dt class="description">
<span
class="cmbx-10">iunit</span> </dt><dd
class="description">The Fortran file unit number.<br
class="newline" />Type:<span
class="cmbx-10">optional</span>.<br
class="newline" />Specified as: an integer value. Only meaningful if filename is not <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">-</span></span></span>.</dd></dl>
<!--l. 33--><p class="indent" >
<dl class="description"><dt class="description">
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
</dd><dt class="description">
<span
class="cmbx-10">a</span> </dt><dd
class="description">the sparse matrix read from file.<br
class="newline" />Type:<span
class="cmbx-10">required</span>.<br
class="newline" />Specified as: a structured data of type <a
href="userhtmlsu6.html#spdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_Tspmat</span><span
class="cmtt-10">_type</span></a>.
</dd><dt class="description">
<span
class="cmbx-10">b</span> </dt><dd
class="description">Rigth hand side(s).<br
class="newline" />Type: <span
class="cmbx-10">Optional </span><br
class="newline" />An array of type real or complex, rank 2 and having the ALLOCATABLE
attribute; will be allocated and filled in if the input file contains a right
hand side, otherwise will be left in the UNALLOCATED state.
</dd><dt class="description">
<span
class="cmbx-10">mtitle</span> </dt><dd
class="description">Matrix title.<br
class="newline" />Type: <span
class="cmbx-10">Optional </span><br
class="newline" />A charachter variable of length 72 holding a copy of the matrix title as
specified by the Harwell-Boeing format and contained in the input file.
</dd><dt class="description">
<span
class="cmbx-10">iret</span> </dt><dd
class="description">Error code.<br
class="newline" />Type: <span
class="cmbx-10">required </span><br
class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
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