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256 lines
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256 lines
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<head><title>psb_gather — Gather Global Dense Matrix</title>
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<h4 class="subsectionHead"><span class="titlemark">5.3 </span> <a
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id="x38-750005.3"></a>psb_gather — Gather Global Dense Matrix</h4>
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<!--l. 353--><p class="noindent" >These subroutines collect the portions of global dense matrix distributed over all
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process into one single array stored on one process.
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<center class="par-math-display" >
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<img
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src="userhtml27x.png" alt="glob-x ← collect(loc-xi)
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" class="par-math-display" ></center>
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<!--l. 357--><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">glob</span>_<span
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class="cmmi-10">x</span> </dt><dd
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class="description">is the global submatrix <span
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class="cmmi-10">glob</span>_<span
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class="cmmi-10">x</span><sub><span
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class="cmr-7">1:</span><span
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class="cmmi-7">m,</span><span
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class="cmr-7">1:</span><span
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class="cmmi-7">n</span></sub>
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</dd><dt class="description">
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<span
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class="cmmi-10">loc</span>_<span
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class="cmmi-10">x</span><sub><span
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class="cmmi-7">i</span></sub> </dt><dd
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class="description">is the local portion of global dense matrix on process <span
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class="cmmi-10">i</span>.
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</dd><dt class="description">
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<span
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class="cmmi-10">collect</span> </dt><dd
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class="description">is the collect function.</dd></dl>
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<div class="table">
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<!--l. 366--><p class="indent" > <a
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id="x38-75001r19"></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. 367--><p class="noindent" >
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<div class="tabular"> <table id="TBL-21" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-21-1g"><col
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id="TBL-21-1"><col
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id="TBL-21-2"></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-21-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-1"
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class="td11"><span
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class="cmmi-10">x</span><sub><span
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class="cmmi-7">i</span></sub><span
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class="cmmi-10">,y </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-2"
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class="td11"><span
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class="cmbx-10">Subroutine</span></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-21-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-1"
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class="td11">Integer </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-2"
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class="td11">psb_gather </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-21-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-1"
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class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-2"
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class="td11">psb_gather </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-21-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-1"
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class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-2"
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class="td11">psb_gather </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-21-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-1"
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class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-2"
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class="td11">psb_gather </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-21-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-1"
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class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-2"
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class="td11">psb_gather </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-21-7-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-7-1"
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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 19: </span><span
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class="content">Data types</span></div><!--tex4ht:label?: x38-75001r19 -->
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</div><hr class="endfloat" />
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</div>
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<!--l. 383--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-10">call</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">psb_gather</span><span
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class="cmtt-10">(</span><span
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class="cmtt-10">glob_x</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">loc_x</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">desc_a</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">info</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">root</span><span
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class="cmtt-10">)</span>
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<span class="lstinline"></span><span
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class="cmtt-10">call</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">psb_gather</span><span
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class="cmtt-10">(</span><span
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class="cmtt-10">glob_x</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">loc_x</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">desc_a</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">info</span><span
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class="cmtt-10">,</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">root</span><span
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class="cmtt-10">)</span>
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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">loc</span><span
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class="cmbx-10">_x</span> </dt><dd
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class="description">the local portion of global dense matrix <span
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class="cmmi-10">glob</span>_<span
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class="cmmi-10">x</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: a rank one or two array or an object of type
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<a
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href="userhtmlsu7.html#vdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_vect</span><span
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class="cmtt-10">_type</span></a> indicated in Table <a
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href="#x38-75001r19">19<!--tex4ht:ref: tab:gather --></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: a structured data 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">root</span> </dt><dd
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class="description">The process that holds the global copy. If <span
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class="cmmi-10">root </span>= <span
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class="cmsy-10">-</span>1 all the processes will
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have a copy of the global vector.<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" />Type: <span
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class="cmbx-10">optional</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 integer variable <span
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class="cmsy-10">-</span>1 <span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">root </span><span
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class="cmsy-10">≤ </span><span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1, default <span
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class="cmsy-10">-</span>1.
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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">glob</span><span
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class="cmbx-10">_x</span> </dt><dd
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class="description">The array where the local parts must be gathered.<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" />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" />Specified as: a rank one or two array with the <span class="lstinline"></span><span
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class="cmtt-10">ALLOCATABLE</span> attribute.
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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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