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274 lines
6.9 KiB
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HREF="node40.html">psb_gather Gather</A>
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<H2><A NAME="SECTION00064000000000000000">
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psb_scatter -- Scatter Global Dense Matrix</A>
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</H2>
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<P>
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These subroutines scatters the portions of global dense matrix owned
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by a process to all the processes in the processes grid.
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER">
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<!-- MATH
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\begin{displaymath}
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loc\_x_i \leftarrow scatter(glob\_x)
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\end{displaymath}
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-->
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<IMG
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WIDTH="167" HEIGHT="28" BORDER="0"
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SRC="img84.png"
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ALT="\begin{displaymath}loc\_x_i \leftarrow scatter(glob\_x) \end{displaymath}">
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</DIV>
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<BR CLEAR="ALL">
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<P></P>
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where:
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<DL>
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<DT><STRONG><IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img76.png"
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ALT="$glob\_x$"></STRONG></DT>
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<DD>is the global matrix <!-- MATH
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$glob\_x_{1:m,1:n}$
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-->
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<IMG
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WIDTH="91" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img77.png"
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ALT="$glob\_x_{1:m,1:n}$">
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</DD>
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<DT><STRONG><IMG
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WIDTH="43" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img78.png"
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ALT="$loc\_x_i$"></STRONG></DT>
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<DD>is the local portion of global dense matrix on
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process <IMG
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WIDTH="10" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
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SRC="img4.png"
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ALT="$i$">.
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</DD>
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<DT><STRONG><IMG
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WIDTH="54" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img85.png"
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ALT="$scatter$"></STRONG></DT>
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<DD>is the scatter function.
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</DD>
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</DL>
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<P>
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<BR><P></P>
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<DIV ALIGN="CENTER"><A NAME="2682"></A>
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<TABLE>
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<CAPTION><STRONG>Table 16:</STRONG>
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Data types</CAPTION>
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<TR><TD>
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<DIV ALIGN="CENTER">
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<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
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<TR><TD ALIGN="LEFT"><IMG
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WIDTH="33" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img80.png"
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ALT="$x_i, y$"></TD>
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<TD ALIGN="LEFT"><B>Subroutine</B></TD>
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</TR>
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<TR><TD ALIGN="LEFT">Integer</TD>
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<TD ALIGN="LEFT">psb_scatter</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Short Precision Real</TD>
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<TD ALIGN="LEFT">psb_scatter</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Long Precision Real</TD>
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<TD ALIGN="LEFT">psb_scatter</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Short Precision Complex</TD>
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<TD ALIGN="LEFT">psb_scatter</TD>
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</TR>
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<TR><TD ALIGN="LEFT">Long Precision Complex</TD>
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<TD ALIGN="LEFT">psb_scatter</TD>
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</TR>
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</TABLE>
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</DIV>
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</TD></TR>
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</TABLE>
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</DIV><P></P>
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<BR>
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<P>
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<PRE>
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call psb_scatter(glob_x, loc_x, desc_a, info, root)
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call psb_scatter(glob_x, loc_x, desc_a, info, root)
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</PRE>
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>glob_x</STRONG></DT>
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<DD>The array that must be scattered into local pieces.
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<BR>
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Scope: <B>global</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a rank one or two array.
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</DD>
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<DT><STRONG>desc_a</STRONG></DT>
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<DD>contains data structures for communications.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a structured data of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>root</STRONG></DT>
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<DD>The process that holds the global copy. If <IMG
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WIDTH="75" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img81.png"
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ALT="$root=-1$"> all
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the processes have a copy of the global vector.
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<BR>
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Scope: <B>global</B>
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<BR>
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Type: <B>optional</B>
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer variable <!-- MATH
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$-1\le root\le np-1$
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-->
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<IMG
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WIDTH="140" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img82.png"
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ALT="$-1\le root\le np-1$">, default <IMG
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WIDTH="25" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img83.png"
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ALT="$-1$">.
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</DD>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>loc_x</STRONG></DT>
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<DD>the local portion of global dense matrix
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<IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img76.png"
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ALT="$glob\_x$">.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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Specified as: a rank one or two array containing numbers of the type
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indicated in Table <A HREF="#tab:scatter">16</A>.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Error code.
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>required</B>
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<BR>
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Intent: <B>out</B>.
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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