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<head><title>psb_geaxpby &#8212; General Dense Matrix Sum</title> 
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   <h4 class="subsectionHead"><span class="titlemark">4.1   </span> <a 
 id="x19-560004.1"></a>psb_geaxpby &#8212; General Dense Matrix Sum</h4>
<!--l. 10--><p class="noindent" >This subroutine is an interface to the computational kernel for dense matrix
sum:
   <center class="math-display" >
<img 
src="userhtml1x.png" alt="y &#x2190; &#x03B1; x+ &#x03B2;y
" class="math-display" ></center>
<!--l. 12--><p class="nopar" >
<!--l. 19--><p class="indent" >   <span class="lstinline"></span><span 
class="cmtt-10">call</span><span 
class="cmtt-10">&#x00A0;</span><span 
class="cmtt-10">psb_geaxpby</span><span 
class="cmtt-10">(</span><span 
class="cmtt-10">alpha</span><span 
class="cmtt-10">,</span><span 
class="cmtt-10">&#x00A0;</span><span 
class="cmtt-10">x</span><span 
class="cmtt-10">,</span><span 
class="cmtt-10">&#x00A0;</span><span 
class="cmtt-10">beta</span><span 
class="cmtt-10">,</span><span 
class="cmtt-10">&#x00A0;</span><span 
class="cmtt-10">y</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>
   <div class="table">
                                                                  

                                                                  
<!--l. 23--><p class="indent" >   <a 
 id="x19-56001r1"></a><hr class="float"><div class="float" 
>
                                                                  

                                                                  
<div class="center" 
>
<!--l. 24--><p class="noindent" >
<div class="tabular"> <table id="TBL-1" class="tabular" 
cellspacing="0" cellpadding="0"  
><colgroup id="TBL-1-1g"><col 
id="TBL-1-1"><col 
id="TBL-1-2"></colgroup><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-1-1-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-1-1"  
class="td11"><span 
class="cmmi-10">x</span>, <span 
class="cmmi-10">y</span>, <span 
class="cmmi-10">&#x03B1;</span>, <span 
class="cmmi-10">&#x03B2;                </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-1-1-2"  
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-1-2-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-2-1"  
class="td11">Short Precision Real      </td><td  style="white-space:nowrap; text-align:left;" id="TBL-1-2-2"  
class="td11">psb_geaxpby</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-1-3-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-3-1"  
class="td11">Long Precision Real      </td><td  style="white-space:nowrap; text-align:left;" id="TBL-1-3-2"  
class="td11">psb_geaxpby</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-1-4-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-4-1"  
class="td11">Short Precision Complex</td><td  style="white-space:nowrap; text-align:left;" id="TBL-1-4-2"  
class="td11">psb_geaxpby</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-1-5-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-5-1"  
class="td11">Long Precision Complex </td><td  style="white-space:nowrap; text-align:left;" id="TBL-1-5-2"  
class="td11">psb_geaxpby</td>
</tr><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-1-6-"><td  style="white-space:nowrap; text-align:left;" id="TBL-1-6-1"  
class="td11">                     </td></tr></table></div></div>
<br /> <div class="caption" 
><span class="id">Table&#x00A0;1: </span><span  
class="content">Data types</span></div><!--tex4ht:label?: x19-56001r1 -->
                                                                  

                                                                  
   </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">alpha</span> </dt><dd 
class="description">the scalar <span 
class="cmmi-10">&#x03B1;</span>.<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">in</span>.<br 
class="newline" />Specified as: a number of the data type indicated in Table&#x00A0;<a 
href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.
     </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="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>. The
     rank of <span 
class="cmmi-10">x </span>must be the same of <span 
class="cmmi-10">y</span>.
     </dd><dt class="description">
<span 
class="cmbx-10">beta</span> </dt><dd 
class="description">the scalar <span 
class="cmmi-10">&#x03B2;</span>.<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">in</span>.<br 
class="newline" />Specified as: a number of the data type indicated in Table&#x00A0;<a 
href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.
     </dd><dt class="description">
<span 
class="cmbx-10">y</span> </dt><dd 
class="description">the local portion of the global dense matrix <span 
class="cmmi-10">y</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">inout</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 the type indicated in Table&#x00A0;<a 
href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.
     The rank of <span 
class="cmmi-10">y </span>must be the same of <span 
class="cmmi-10">x</span>.
     </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></dl>
     <dl class="description"><dt class="description">
<span 
class="cmbx-10">On Return</span> </dt><dd 
class="description">
                                                                  

                                                                  
     </dd><dt class="description">
<span 
class="cmbx-10">y</span> </dt><dd 
class="description">the local portion of result submatrix <span 
class="cmmi-10">y</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">inout</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 the type indicated in Table&#x00A0;<a 
href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.
     </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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