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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. 858--><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. 860--><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. 866--><p class="indent" > <a
id="x29-6600111"></a><hr class="float"><div class="float"
>
<div class="center"
>
<!--l. 867--><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?: x29-6600111 -->
</div><hr class="endfloat" />
</div>
<div class="verbatim" id="verbatim-50">
psb_spnrmi(A,&#x00A0;desc_a,&#x00A0;info)
&#x00A0;<br />psb_normi(A,&#x00A0;desc_a,&#x00A0;info)
</div>
<!--l. 885--><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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