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<h4 class="subsectionHead"><span class="titlemark">5.3 </span> <a
id="x38-750005.3"></a>psb_gather &#8212; Gather Global Dense Matrix</h4>
<!--l. 357--><p class="noindent" >These subroutines collect the portions of global dense matrix distributed over all
process into one single array stored on one process.
<center class="par-math-display" >
<img
src="userhtml27x.png" alt="glob-x &#x2190; collect(loc-xi)
" class="par-math-display" ></center>
<!--l. 361--><p class="nopar" > where:
<dl class="description"><dt class="description">
<span
class="cmmi-10">glob</span>_<span
class="cmmi-10">x</span> </dt><dd
class="description">is the global submatrix <span
class="cmmi-10">glob</span>_<span
class="cmmi-10">x</span><sub><span
class="cmr-7">1:</span><span
class="cmmi-7">m,</span><span
class="cmr-7">1:</span><span
class="cmmi-7">n</span></sub>
</dd><dt class="description">
<span
class="cmmi-10">loc</span>_<span
class="cmmi-10">x</span><sub><span
class="cmmi-7">i</span></sub> </dt><dd
class="description">is the local portion of global dense matrix on process <span
class="cmmi-10">i</span>.
</dd><dt class="description">
<span
class="cmmi-10">collect</span> </dt><dd
class="description">is the collect function.</dd></dl>
<div class="table">
<!--l. 370--><p class="indent" > <a
id="x38-7500119"></a><hr class="float"><div class="float"
>
<div class="center"
>
<!--l. 371--><p class="noindent" >
<div class="tabular"> <table id="TBL-21" class="tabular"
cellspacing="0" cellpadding="0"
><colgroup id="TBL-21-1g"><col
id="TBL-21-1"><col
id="TBL-21-2"></colgroup><tr
class="hline"><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-21-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-1"
class="td11"><span
class="cmmi-10">x</span><sub><span
class="cmmi-7">i</span></sub><span
class="cmmi-10">,y </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-2"
class="td11"><span
class="cmbx-10">Subroutine</span></td>
</tr><tr
class="hline"><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-21-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-1"
class="td11">Integer </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-2"
class="td11">psb_gather </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-21-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-1"
class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-2"
class="td11">psb_gather </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-21-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-1"
class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-2"
class="td11">psb_gather </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-21-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-1"
class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-2"
class="td11">psb_gather </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-21-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-1"
class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-2"
class="td11">psb_gather </td>
</tr><tr
class="hline"><td><hr></td><td><hr></td></tr><tr
style="vertical-align:baseline;" id="TBL-21-7-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-7-1"
class="td11"> </td></tr></table></div></div>
<br /> <div class="caption"
><span class="id">Table&#x00A0;19: </span><span
class="content">Data types</span></div><!--tex4ht:label?: x38-7500119 -->
</div><hr class="endfloat" />
</div>
<!--l. 387-->
<div class="lstlisting" id="listing-7"><span class="label"><a
id="x38-75002r1"></a></span><span
class="cmtt-10">call</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">psb_gather</span><span
class="cmtt-10">(</span><span
class="cmtt-10">glob_x</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">loc_x</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">desc_a</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">info</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">root</span><span
class="cmtt-10">)</span><span
class="cmtt-10">&#x00A0;</span><br /><span class="label"><a
id="x38-75003r2"></a></span><span
class="cmtt-10">call</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">psb_gather</span><span
class="cmtt-10">(</span><span
class="cmtt-10">glob_x</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">loc_x</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">desc_a</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">info</span><span
class="cmtt-10">,</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">root</span><span
class="cmtt-10">)</span>
</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">loc</span><span
class="cmbx-10">_x</span> </dt><dd
class="description">the local portion of global dense matrix <span
class="cmmi-10">glob</span>_<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;indicated in Table&#x00A0;<a
href="#x38-7500119">19<!--tex4ht:ref: tab:gather --></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: a structured data 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">root</span> </dt><dd
class="description">The process that holds the global copy. If <span
class="cmmi-10">root </span>= <span
class="cmsy-10">-</span>1 all the processes will
have a copy of the global vector.<br
class="newline" />Scope: <span
class="cmbx-10">global </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 integer variable <span
class="cmsy-10">-</span>1 <span
class="cmsy-10">&#x2264; </span><span
class="cmmi-10">root </span><span
class="cmsy-10">&#x2264; </span><span
class="cmmi-10">np </span><span
class="cmsy-10">- </span>1, default <span
class="cmsy-10">-</span>1.
</dd><dt class="description">
<span
class="cmbx-10">On Return</span> </dt><dd
class="description">
</dd><dt class="description">
<span
class="cmbx-10">glob</span><span
class="cmbx-10">_x</span> </dt><dd
class="description">The array where the local parts must be gathered.<br
class="newline" />Scope: <span
class="cmbx-10">global </span><br
class="newline" />Type: <span
class="cmbx-10">required</span><br
class="newline" />Intent: <span
class="cmbx-10">out</span>.<br
class="newline" />Specified as: a rank one or two array with the <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">ALLOCATABLE</span></span></span> attribute.
</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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