<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!--Converted with LaTeX2HTML 2018 (Released Feb 1, 2018) --> <HTML> <HEAD> <TITLE>psb_gather -- Gather Global Dense Matrix</TITLE> <META NAME="description" CONTENT="psb_gather -- Gather Global Dense Matrix"> <META NAME="keywords" CONTENT="userhtml"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2018"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="userhtml.css"> <LINK REL="next" HREF="node70.html"> <LINK REL="previous" HREF="node68.html"> <LINK REL="up" HREF="node66.html"> <LINK REL="next" HREF="node70.html"> </HEAD> <BODY > <DIV CLASS="navigation"><!--Navigation Panel--> <A NAME="tex2html1105" HREF="node70.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1101" HREF="node66.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1095" HREF="node68.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1103" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1106" HREF="node70.html">psb_scatter Scatter</A> <B> Up:</B> <A NAME="tex2html1102" HREF="node66.html">Communication routines</A> <B> Previous:</B> <A NAME="tex2html1096" HREF="node68.html">psb_ovrl Overlap</A> <B> <A NAME="tex2html1104" HREF="node1.html">Contents</A></B> <BR> <BR></DIV> <!--End of Navigation Panel--> <H2><A NAME="SECTION00063000000000000000"> psb_gather -- Gather Global Dense Matrix</A> </H2> <P> These subroutines collect the portions of global dense matrix distributed over all process into one single array stored on one process. <P> <BR><P></P> <DIV ALIGN="CENTER" CLASS="mathdisplay"> <!-- MATH \begin{displaymath} glob\_x \leftarrow collect(loc\_x_i) \end{displaymath} --> <IMG WIDTH="163" HEIGHT="28" BORDER="0" SRC="img73.png" ALT="\begin{displaymath}glob\_x \leftarrow collect(loc\_x_i) \end{displaymath}"> </DIV> <BR CLEAR="ALL"> <P></P> where: <DL> <DT><STRONG><SPAN CLASS="MATH"><IMG WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img74.png" ALT="$glob\_x$"></SPAN></STRONG></DT> <DD>is the global submatrix <!-- MATH $glob\_x_{1:m,1:n}$ --> <SPAN CLASS="MATH"><IMG WIDTH="91" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img75.png" ALT="$glob\_x_{1:m,1:n}$"></SPAN> </DD> <DT><STRONG><SPAN CLASS="MATH"><IMG WIDTH="43" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img76.png" ALT="$loc\_x_i$"></SPAN></STRONG></DT> <DD>is the local portion of global dense matrix on process <SPAN CLASS="MATH"><IMG WIDTH="9" HEIGHT="17" ALIGN="BOTTOM" BORDER="0" SRC="img4.png" ALT="$i$"></SPAN>. </DD> <DT><STRONG><SPAN CLASS="MATH"><IMG WIDTH="49" HEIGHT="14" ALIGN="BOTTOM" BORDER="0" SRC="img77.png" ALT="$collect$"></SPAN></STRONG></DT> <DD>is the collect function. </DD> </DL> <P> <BR><P></P> <DIV ALIGN="CENTER"><A NAME="3474"></A> <TABLE> <CAPTION><STRONG>Table 16:</STRONG> Data types</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TD ALIGN="LEFT"><SPAN CLASS="MATH"><IMG WIDTH="33" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img78.png" ALT="$x_i, y$"></SPAN></TD> <TD ALIGN="LEFT"><B>Subroutine</B></TD> </TR> <TR><TD ALIGN="LEFT">Integer</TD> <TD ALIGN="LEFT">psb_gather</TD> </TR> <TR><TD ALIGN="LEFT">Short Precision Real</TD> <TD ALIGN="LEFT">psb_gather</TD> </TR> <TR><TD ALIGN="LEFT">Long Precision Real</TD> <TD ALIGN="LEFT">psb_gather</TD> </TR> <TR><TD ALIGN="LEFT">Short Precision Complex</TD> <TD ALIGN="LEFT">psb_gather</TD> </TR> <TR><TD ALIGN="LEFT">Long Precision Complex</TD> <TD ALIGN="LEFT">psb_gather</TD> </TR> </TABLE> </DIV> </TD></TR> </TABLE> </DIV><P></P> <BR> <P> <BR> <IMG WIDTH="471" HEIGHT="35" ALIGN="BOTTOM" BORDER="0" SRC="img79.png" ALT="\begin{lstlisting} call psb_gather(glob_x, loc_x, desc_a, info, root) call psb_gather(glob_x, loc_x, desc_a, info, root) \end{lstlisting}"> <BR> <P> <DL> <DT><STRONG>Type:</STRONG></DT> <DD>Synchronous. </DD> <DT><STRONG><B>On Entry</B></STRONG></DT> <DD> </DD> <DT><STRONG>loc_x</STRONG></DT> <DD>the local portion of global dense matrix <SPAN CLASS="MATH"><IMG WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img74.png" ALT="$glob\_x$"></SPAN>. <BR> Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>in</B>. <BR> Specified as: a rank one or two array or an object of type vdata<TT>psb_T_vect_type</TT> indicated in Table <A HREF="#tab:gather">16</A>. </DD> <DT><STRONG>desc_a</STRONG></DT> <DD>contains data structures for communications. <BR> Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>in</B>. <BR> Specified as: a structured data of type descdata<TT>psb_desc_type</TT>. </DD> <DT><STRONG>root</STRONG></DT> <DD>The process that holds the global copy. If <SPAN CLASS="MATH"><IMG WIDTH="74" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img80.png" ALT="$root=-1$"></SPAN> all the processes will have a copy of the global vector. <BR> Scope: <B>global</B> <BR> Type: <B>optional</B> <BR> Intent: <B>in</B>. <BR> Specified as: an integer variable <!-- MATH $-1\le root\le np-1$ --> <SPAN CLASS="MATH"><IMG WIDTH="141" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img81.png" ALT="$-1\le root\le np-1$"></SPAN>, default <SPAN CLASS="MATH"><IMG WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img82.png" ALT="$-1$"></SPAN>. </DD> <DT><STRONG><B>On Return</B></STRONG></DT> <DD> </DD> <DT><STRONG>glob_x</STRONG></DT> <DD>The array where the local parts must be gathered. <BR> Scope: <B>global</B> <BR> Type: <B>required</B> <BR> Intent: <B>out</B>. <BR> Specified as: a rank one or two array with the <code>ALLOCATABLE</code> attribute. </DD> <DT><STRONG>info</STRONG></DT> <DD>Error code. <BR> Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>out</B>. <BR> An integer value; 0 means no error has been detected. </DD> </DL> <P> <DIV CLASS="navigation"><HR> <!--Navigation Panel--> <A NAME="tex2html1105" HREF="node70.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1101" HREF="node66.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1095" HREF="node68.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1103" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1106" HREF="node70.html">psb_scatter Scatter</A> <B> Up:</B> <A NAME="tex2html1102" HREF="node66.html">Communication routines</A> <B> Previous:</B> <A NAME="tex2html1096" HREF="node68.html">psb_ovrl Overlap</A> <B> <A NAME="tex2html1104" HREF="node1.html">Contents</A></B> </DIV> <!--End of Navigation Panel--> </BODY> </HTML>