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<head><title>psb_normi &#8212; Infinity Norm of Sparse Matrix</title> 
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   <h4 class="subsectionHead"><span class="titlemark">4.11   </span> <a 
 id="x29-660004.11"></a>psb_normi &#8212; Infinity Norm of Sparse Matrix</h4>
<!--l. 868--><p class="noindent" >This function computes the infinity-norm of a matrix <span 
class="cmmi-10">A</span>:<br 
class="newline" />
   <center class="par-math-display" >
<img 
src="userhtml17x.png" alt="nrmi &#x2190;  &#x2225;A&#x2225;&#x221E;
" class="par-math-display" ></center>
<!--l. 870--><p class="nopar" > where:
     <dl class="description"><dt class="description">
<span 
class="cmmi-10">A</span> </dt><dd 
class="description">represents the global matrix <span 
class="cmmi-10">A</span></dd></dl>
   <div class="table">
                                                                  

                                                                  
<!--l. 876--><p class="indent" >   <a 
 id="x29-66001r11"></a><hr class="float"><div class="float" 
>
                                                                  

                                                                  
<div class="center" 
>
<!--l. 877--><p class="noindent" >
<div class="tabular"> <table id="TBL-11" class="tabular" 
cellspacing="0" cellpadding="0"  
><colgroup id="TBL-11-1g"><col 
id="TBL-11-1"><col 
id="TBL-11-2"></colgroup><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-11-1-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-1-1"  
class="td11"><span 
class="cmmi-10">A                         </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-11-1-2"  
class="td11"><span 
class="cmbx-10">Function  </span></td></tr><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-11-2-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-2-1"  
class="td11">Short Precision Real </td><td  style="white-space:nowrap; text-align:left;" id="TBL-11-2-2"  
class="td11">psb_spnrmi</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-11-3-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-3-1"  
class="td11">Long Precision Real      </td><td  style="white-space:nowrap; text-align:left;" id="TBL-11-3-2"  
class="td11">psb_spnrmi</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-11-4-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-4-1"  
class="td11">Short Precision Complex</td><td  style="white-space:nowrap; text-align:left;" id="TBL-11-4-2"  
class="td11">psb_spnrmi</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-11-5-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-5-1"  
class="td11">Long Precision Complex </td><td  style="white-space:nowrap; text-align:left;" id="TBL-11-5-2"  
class="td11">psb_spnrmi</td>
</tr><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-11-6-"><td  style="white-space:nowrap; text-align:left;" id="TBL-11-6-1"  
class="td11">                     </td></tr></table></div></div>
<br /> <div class="caption" 
><span class="id">Table&#x00A0;11: </span><span  
class="content">Data types</span></div><!--tex4ht:label?: x29-66001r11 -->
                                                                  

                                                                  
   </div><hr class="endfloat" />
   </div>
                                                                  

                                                                  
   <pre class="verbatim" id="verbatim-32">
psb_spnrmi(A,&#x00A0;desc_a,&#x00A0;info)
psb_normi(A,&#x00A0;desc_a,&#x00A0;info)
</pre>
<!--l. 895--><p class="nopar" >
     <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 local portion of the global sparse matrix <span 
class="cmmi-10">A</span>. <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">in</span>.<br 
class="newline" />Specified as: an object 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">desc</span><span 
class="cmbx-10">_a</span> </dt><dd 
class="description">contains data structures for communications.<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">in</span>.<br 
class="newline" />Specified as: an object of type <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">On Return</span> </dt><dd 
class="description">
     </dd><dt class="description">
<span 
class="cmbx-10">Function value</span> </dt><dd 
class="description">is the infinity-norm of sparse submatrix <span 
class="cmmi-10">A</span>.<br 
class="newline" />Scope: <span 
class="cmbx-10">global </span><br 
class="newline" />Specified as: a long precision real number.
     </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>
                                                                  

                                                                  
                                                                  

                                                                  
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