<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 2012 (1.2) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>psb_amn -- Global minimum absolute value</TITLE> <META NAME="description" CONTENT="psb_amn -- Global minimum absolute value"> <META NAME="keywords" CONTENT="userhtml"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2012"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="userhtml.css"> <LINK REL="next" HREF="node113.html"> <LINK REL="previous" HREF="node111.html"> <LINK REL="up" HREF="node98.html"> <LINK REL="next" HREF="node113.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1654" HREF="node113.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1650" HREF="node98.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1644" HREF="node111.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1652" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1655" HREF="node113.html">psb_snd Send</A> <B> Up:</B> <A NAME="tex2html1651" HREF="node98.html">Parallel environment routines</A> <B> Previous:</B> <A NAME="tex2html1645" HREF="node111.html">psb_amx Global</A> <B> <A NAME="tex2html1653" HREF="node1.html">Contents</A></B> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION000814000000000000000"> psb_amn -- Global minimum absolute value</A> </H2> <P> <PRE> call psb_amn(icontxt, dat, root) </PRE> <P> This subroutine implements a minimum absolute value reduction operation based on the underlying communication library. <DL> <DT><STRONG>Type:</STRONG></DT> <DD>Synchronous. </DD> <DT><STRONG><B>On Entry </B></STRONG></DT> <DD> </DD> <DT><STRONG>icontxt</STRONG></DT> <DD>the communication context identifying the virtual parallel machine. <BR> Scope: <B>global</B>. <BR> Type: <B>required</B>. <BR> Intent: <B>in</B>. <BR> Specified as: an integer variable. </DD> <DT><STRONG>dat</STRONG></DT> <DD>The local contribution to the global minimum. <BR> Scope: <B>local</B>. <BR> Type: <B>required</B>. <BR> Intent: <B>inout</B>. <BR> Specified as: an integer, real or complex variable, which may be a scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes. </DD> <DT><STRONG>root</STRONG></DT> <DD>Process to hold the final value, or <IMG WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img78.png" ALT="$-1$"> to make it available on all processes. <BR> Scope: <B>global</B>. <BR> Type: <B>optional</B>. <BR> Intent: <B>in</B>. <BR> Specified as: an integer value <!-- MATH $-1<= root <= np-1$ --> <IMG WIDTH="165" HEIGHT="30" ALIGN="MIDDLE" BORDER="0" SRC="img132.png" ALT="$-1<= root <= np-1$">, default -1. <BR></DD> </DL> <P> <DL> <DT><STRONG><B>On Return</B></STRONG></DT> <DD> </DD> <DT><STRONG>dat</STRONG></DT> <DD>On destination process(es), the result of the minimum operation. <BR> Scope: <B>global</B>. <BR> Type: <B>required</B>. <BR> Intent: <B>inout</B>. <BR> Specified as: an integer, real or complex variable, which may be a scalar, or a rank 1 or 2 array. <BR> Type, kind, rank and size must agree on all processes. </DD> </DL> <P> <FONT SIZE="+1"><B>Notes</B></FONT> <OL> <LI>The <code>dat</code> argument is both input and output, and its value may be changed even on processes different from the final result destination. </LI> <LI>The <code>dat</code> argument may also be a long integer scalar. </LI> </OL> <P> <HR> <!--Navigation Panel--> <A NAME="tex2html1654" HREF="node113.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1650" HREF="node98.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1644" HREF="node111.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1652" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1655" HREF="node113.html">psb_snd Send</A> <B> Up:</B> <A NAME="tex2html1651" HREF="node98.html">Parallel environment routines</A> <B> Previous:</B> <A NAME="tex2html1645" HREF="node111.html">psb_amx Global</A> <B> <A NAME="tex2html1653" HREF="node1.html">Contents</A></B> <!--End of Navigation Panel--> </BODY> </HTML>