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<B> Next:</B> <A NAME="tex2html1161"
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HREF="node74.html">Data management routines</A>
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<B> Up:</B> <A NAME="tex2html1157"
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HREF="node69.html">Communication routines</A>
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<B> Previous:</B> <A NAME="tex2html1153"
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HREF="node72.html">psb_gather Gather</A>
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<B> <A NAME="tex2html1159"
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HREF="node1.html">Contents</A></B>
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<BR></DIV>
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<!--End of Navigation Panel-->
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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" CLASS="mathdisplay">
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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="168" HEIGHT="29" BORDER="0"
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SRC="img89.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><SPAN CLASS="MATH"><IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img80.png"
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ALT="$glob\_x$"></SPAN></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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<SPAN CLASS="MATH"><IMG
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WIDTH="90" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img81.png"
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ALT="$glob\_x_{1:m,1:n}$"></SPAN>
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</DD>
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<DT><STRONG><SPAN CLASS="MATH"><IMG
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WIDTH="44" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img82.png"
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ALT="$loc\_x_i$"></SPAN></STRONG></DT>
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<DD>is the local portion of global dense matrix on
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process <SPAN CLASS="MATH"><IMG
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WIDTH="9" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
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SRC="img4.png"
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ALT="$i$"></SPAN>.
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</DD>
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<DT><STRONG><SPAN CLASS="MATH"><IMG
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WIDTH="53" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img90.png"
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ALT="$scatter$"></SPAN></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="3840"></A>
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<TABLE>
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<CAPTION><STRONG>Table 20:</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"><SPAN CLASS="MATH"><IMG
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WIDTH="34" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img84.png"
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ALT="$x_i, y$"></SPAN></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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<BR>
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<IMG
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WIDTH="539" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img91.png"
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ALT="\begin{lstlisting}
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call psb_scatter(glob_x, loc_x, desc_a, info, root, mold)
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\end{lstlisting}">
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<BR>
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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 <SPAN CLASS="MATH"><IMG
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WIDTH="74" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img86.png"
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ALT="$root=-1$"></SPAN> 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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<SPAN CLASS="MATH"><IMG
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WIDTH="140" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img87.png"
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ALT="$-1\le root\le np-1$"></SPAN>, default
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<code>psb_root_</code>, i.e. process 0.
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</DD>
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<DT><STRONG>mold</STRONG></DT>
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<DD>The desired dynamic type for the internal vector storage.
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<BR>
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Scope: <B>local</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 object of a class derived from vbasedata<TT>psb_T_base_vect_type</TT>; this is
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only allowed when loc_x is of type vdata<TT>psb_T_vect_type</TT>.
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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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<SPAN CLASS="MATH"><IMG
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WIDTH="46" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img80.png"
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ALT="$glob\_x$"></SPAN>.
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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 ALLOCATABLE array or an object of type vdata<TT>psb_T_vect_type</TT> containing numbers of the type
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indicated in Table <A HREF="#tab:scatter">20</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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<B> Next:</B> <A NAME="tex2html1161"
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<B> Up:</B> <A NAME="tex2html1157"
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HREF="node69.html">Communication routines</A>
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<B> Previous:</B> <A NAME="tex2html1153"
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<B> <A NAME="tex2html1159"
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