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<head><title>psb_genrm2s &#8212; Generalized 2-Norm of Vector</title>
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<h4 class="subsectionHead"><span class="titlemark">4.9 </span> <a
id="x27-640004.9"></a>psb_genrm2s &#8212; Generalized 2-Norm of Vector</h4>
<!--l. 727--><p class="noindent" >This subroutine computes a series of 2-norms on the columns of a dense matrix
<span
class="cmmi-10">x</span>:
<center class="math-display" >
<img
src="userhtml15x.png" alt="res(i) &#x2190; &#x2225;x(:,i)&#x2225;2
" class="math-display" ></center>
<!--l. 729--><p class="nopar" >
<div class="verbatim" id="verbatim-48">
call&#x00A0;psb_genrm2s(res,&#x00A0;x,&#x00A0;desc_a,&#x00A0;info)
</div>
<!--l. 734--><p class="nopar" >
<div class="table">
<!--l. 736--><p class="indent" > <a
id="x27-640019"></a><hr class="float"><div class="float"
>
<div class="center"
>
<!--l. 737--><p class="noindent" >
<div class="tabular"> <table id="TBL-9" class="tabular"
cellspacing="0" cellpadding="0"
><colgroup id="TBL-9-1g"><col
id="TBL-9-1"><col
id="TBL-9-2"><col
id="TBL-9-3"></colgroup><tr
class="hline"><td><hr></td><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-9-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-1-1"
class="td11"><span
class="cmmi-10">res </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-9-1-2"
class="td11"><span
class="cmmi-10">x </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-9-1-3"
class="td11"><span
class="cmbx-10">Subroutine</span></td></tr><tr
class="hline"><td><hr></td><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-9-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-2-1"
class="td11">Short Precision Real</td><td style="white-space:nowrap; text-align:left;" id="TBL-9-2-2"
class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-9-2-3"
class="td11">psb_genrm2s</td>
</tr><tr
style="vertical-align:baseline;" id="TBL-9-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-3-1"
class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-9-3-2"
class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-9-3-3"
class="td11">psb_genrm2s</td>
</tr><tr
style="vertical-align:baseline;" id="TBL-9-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-4-1"
class="td11">Short Precision Real</td><td style="white-space:nowrap; text-align:left;" id="TBL-9-4-2"
class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-9-4-3"
class="td11">psb_genrm2s</td>
</tr><tr
style="vertical-align:baseline;" id="TBL-9-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-5-1"
class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-9-5-2"
class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-9-5-3"
class="td11">psb_genrm2s</td>
</tr><tr
class="hline"><td><hr></td><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-9-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-9-6-1"
class="td11"> </td></tr></table></div></div>
<br /> <div class="caption"
><span class="id">Table&#x00A0;9: </span><span
class="content">Data types</span></div><!--tex4ht:label?: x27-640019 -->
</div><hr class="endfloat" />
</div>
<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">x</span> </dt><dd
class="description">the local portion of global dense matrix <span
class="cmmi-10">x</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: a rank one or two array or an object of type
<a
href="userhtmlsu7.html#vdata"><span
class="cmtt-10">psb</span><span
class="cmtt-10">_T</span><span
class="cmtt-10">_vect</span><span
class="cmtt-10">_type</span></a>&#x00A0;containing numbers of type specified in Table&#x00A0;<a
href="#x27-640019">9<!--tex4ht:ref: tab:f90nrm2s --></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">res</span> </dt><dd
class="description">contains the 1-norm of (the columns of) <span
class="cmmi-10">x</span>.<br
class="newline" />Scope: <span
class="cmbx-10">global </span><br
class="newline" />Intent: <span
class="cmbx-10">out</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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