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<head><title> hb_read &#8212; Read a sparse matrix from a file in the Harwell&#8211;Boeing
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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-14"><span class="label"><a 
 id="x92-129001r1"></a></span><span 
class="cmbx-10">call</span>&#x00A0;hb_read(a,&#x00A0;iret,&#x00A0;iunit,&#x00A0;filename,&#x00A0;b,&#x00A0;mtitle)
   
   </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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