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   <h4 class="subsectionHead"><span class="titlemark">10.2   </span> <a 
 id="x101-13700010.2"></a>build &#8212; Builds a preconditioner</h4>
                                                                  

                                                                  
   <pre class="verbatim" id="verbatim-87">
call&#x00A0;prec%build(a,&#x00A0;desc_a,&#x00A0;info[,amold,vmold,imold])
</pre>
<!--l. 91--><p class="nopar" >
<!--l. 93--><p class="indent" >
     <dl class="description"><dt class="description">
<span 
class="cmbx-10">Type:</span> </dt><dd 
class="description">Synchronous.
     </dd><dt class="description">
<span 
class="cmbx-10">On Entry</span> </dt><dd 
class="description">
     </dd><dt class="description">
<span 
class="cmbx-10">a</span> </dt><dd 
class="description">the system sparse matrix. Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required</span><br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>, target.<br 
class="newline" />Specified as: a sparse matrix data structure <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">prec</span> </dt><dd 
class="description">the preconditioner.<br 
class="newline" />Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required</span><br 
class="newline" />Intent: <span 
class="cmbx-10">inout</span>.<br 
class="newline" />Specified   as:   an   already   initialized   precondtioner   data   structure
     <a 
href="userhtmlsu8.html#precdata"><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_prec</span><span 
class="cmtt-10">_type</span></a><br 
class="newline" />
     </dd><dt class="description">
<span 
class="cmbx-10">desc</span><span 
class="cmbx-10">_a</span> </dt><dd 
class="description">the problem communication descriptor. Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required</span><br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>, target.<br 
class="newline" />Specified as: a communication descriptor data structure <a 
href="userhtmlsu5.html#descdata"><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_desc</span><span 
class="cmtt-10">_type</span></a>.
     </dd><dt class="description">
<span 
class="cmbx-10">amold</span> </dt><dd 
class="description">The desired dynamic type for the internal matrix storage.<br 
class="newline" />Scope: <span 
class="cmbx-10">local</span>.<br 
class="newline" />Type: <span 
class="cmbx-10">optional</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: an object of a class derived from <a 
 id="spbasedata"></a><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_T</span><span 
class="cmtt-10">_base</span><span 
class="cmtt-10">_sparse</span><span 
class="cmtt-10">_mat</span>.
     </dd><dt class="description">
<span 
class="cmbx-10">vmold</span> </dt><dd 
class="description">The desired dynamic type for the internal vector storage.<br 
class="newline" />Scope: <span 
class="cmbx-10">local</span>.<br 
class="newline" />Type: <span 
class="cmbx-10">optional</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: an object of a class derived from <a 
 id="vbasedata"></a><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_T</span><span 
class="cmtt-10">_base</span><span 
class="cmtt-10">_vect</span><span 
class="cmtt-10">_type</span>.
     </dd><dt class="description">
<span 
class="cmbx-10">imold</span> </dt><dd 
class="description">The desired dynamic type for the internal integer vector storage.<br 
class="newline" />Scope: <span 
class="cmbx-10">local</span>.<br 
class="newline" />Type: <span 
class="cmbx-10">optional</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified    as:    an    object    of    a    class    derived    from    (integer)
     <a 
 id="vbasedata"></a><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_T</span><span 
class="cmtt-10">_base</span><span 
class="cmtt-10">_vect</span><span 
class="cmtt-10">_type</span>.</dd></dl>
<!--l. 133--><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">prec</span> </dt><dd 
class="description">the preconditioner.<br 
class="newline" />Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required</span><br 
class="newline" />Intent: <span 
class="cmbx-10">inout</span>.<br 
class="newline" />Specified as: a precondtioner data structure <a 
href="userhtmlsu8.html#precdata"><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_prec</span><span 
class="cmtt-10">_type</span></a><br 
class="newline" />
     </dd><dt class="description">
<span 
class="cmbx-10">info</span> </dt><dd 
class="description">Error code.<br 
class="newline" />Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required </span><br 
class="newline" />Intent: <span 
class="cmbx-10">out</span>.<br 
class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
<!--l. 146--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">amold</span></span></span>, <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">vmold</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">imold</span></span></span> arguments may be employed to interface with special
devices, such as GPUs and other accelerators.
                                                                  

                                                                  
                                                                  

                                                                  
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