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<h4 class="subsectionHead"><span class="titlemark">9.2 </span> <a
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id="x93-1300009.2"></a>hb_write — Write a sparse matrix to a file in the Harwell–Boeing
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format</h4>
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<!--l. 59-->
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<div class="lstlisting" id="listing-15"><span class="label"><a
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id="x93-130001r1"></a></span><span
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class="cmtt-10">call</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">hb_write</span><span
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class="cmtt-10">(</span><span
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class="cmtt-10">a</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">iret</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">iunit</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">filename</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">key</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">rhs</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">mtitle</span><span
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class="cmtt-10">)</span>
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</div>
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<!--l. 65--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">a</span> </dt><dd
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class="description">the sparse matrix to be written.<br
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class="newline" />Type:<span
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class="cmbx-10">required</span>.<br
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class="newline" />Specified as: a structured data of type <a
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href="userhtmlsu6.html#spdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_Tspmat</span><span
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class="cmtt-10">_type</span></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">b</span> </dt><dd
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class="description">Rigth hand side.<br
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class="newline" />Type: <span
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class="cmbx-10">Optional </span><br
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class="newline" />An array of type real or complex, rank 1 and having the ALLOCATABLE
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attribute; will be allocated and filled in if the input file contains a right
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hand side.
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</dd><dt class="description">
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<span
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class="cmbx-10">filename</span> </dt><dd
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class="description">The name of the file to be written to.<br
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class="newline" />Type:<span
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class="cmbx-10">optional</span>.<br
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class="newline" />Specified as: a character variable containing a valid file name, or <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">-</span></span></span>, in
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which case the default output unit 6 (i.e. standard output in Unix jargon)
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is used. Default: <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">-</span></span></span>.
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</dd><dt class="description">
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<span
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class="cmbx-10">iunit</span> </dt><dd
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class="description">The Fortran file unit number.<br
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class="newline" />Type:<span
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class="cmbx-10">optional</span>.<br
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class="newline" />Specified as: an integer value. Only meaningful if filename is not <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">-</span></span></span>.
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</dd><dt class="description">
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<span
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class="cmbx-10">key</span> </dt><dd
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class="description">Matrix key.<br
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class="newline" />Type: <span
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class="cmbx-10">Optional </span><br
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class="newline" />A charachter variable of length 8 holding the matrix key as specified by
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the Harwell-Boeing format and to be written to file.
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</dd><dt class="description">
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<span
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class="cmbx-10">mtitle</span> </dt><dd
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class="description">Matrix title.<br
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class="newline" />Type: <span
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class="cmbx-10">Optional </span><br
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class="newline" />A charachter variable of length 72 holding the matrix title as specified by
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the Harwell-Boeing format and to be written to file.</dd></dl>
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<!--l. 96--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">iret</span> </dt><dd
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class="description">Error code.<br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
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