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<head><title>psb_normi — Infinity Norm of Sparse Matrix</title>
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<!--l. 866--><div class="crosslinks"><p class="noindent">[<a
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<h4 class="subsectionHead"><span class="titlemark">4.11 </span> <a
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id="x29-660004.11"></a>psb_normi — Infinity Norm of Sparse Matrix</h4>
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<!--l. 868--><p class="noindent" >This function computes the infinity-norm of a matrix <span
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class="cmmi-10">A</span>:<br
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class="newline" />
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<center class="par-math-display" >
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<img
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src="userhtml17x.png" alt="nrmi ← ∥A∥∞
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" class="par-math-display" ></center>
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<!--l. 870--><p class="nopar" > where:
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<dl class="description"><dt class="description">
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<span
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class="cmmi-10">A</span> </dt><dd
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class="description">represents the global matrix <span
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class="cmmi-10">A</span></dd></dl>
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<div class="table">
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<!--l. 876--><p class="indent" > <a
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id="x29-66001r11"></a><hr class="float"><div class="float"
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>
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<div class="center"
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>
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<!--l. 877--><p class="noindent" >
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<div class="tabular"> <table id="TBL-11" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-11-1g"><col
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id="TBL-11-1"><col
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id="TBL-11-2"></colgroup><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-11-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-1-1"
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class="td11"><span
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class="cmmi-10">A </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-11-1-2"
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class="td11"><span
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class="cmbx-10">Function </span></td></tr><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-11-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-2-1"
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class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-2-2"
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class="td11">psb_spnrmi</td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-11-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-3-1"
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class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-3-2"
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class="td11">psb_spnrmi</td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-11-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-4-1"
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class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-11-4-2"
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class="td11">psb_spnrmi</td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-11-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-5-1"
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class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-5-2"
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class="td11">psb_spnrmi</td>
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</tr><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-11-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-6-1"
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class="td11"> </td></tr></table></div></div>
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<br /> <div class="caption"
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><span class="id">Table 11: </span><span
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class="content">Data types</span></div><!--tex4ht:label?: x29-66001r11 -->
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</div><hr class="endfloat" />
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</div>
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<div class="verbatim" id="verbatim-32">
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psb_spnrmi(A, desc_a, info)
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 <br />psb_normi(A, desc_a, info)
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</div>
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<!--l. 895--><p class="nopar" >
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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">Synchronous.
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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 local portion of the global sparse matrix <span
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class="cmmi-10">A</span>. <br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><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" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an object 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">desc</span><span
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class="cmbx-10">_a</span> </dt><dd
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class="description">contains data structures for communications.<br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><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" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an object of type <a
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href="userhtmlsu5.html#descdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_desc</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">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">Function value</span> </dt><dd
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class="description">is the infinity-norm of sparse submatrix <span
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class="cmmi-10">A</span>.<br
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class="newline" />Scope: <span
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class="cmbx-10">global </span><br
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class="newline" />Specified as: a long precision real number.
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</dd><dt class="description">
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<span
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class="cmbx-10">info</span> </dt><dd
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class="description">Error code.<br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><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" />Intent: <span
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class="cmbx-10">out</span>.<br
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class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
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