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HREF="node69.html">Communication routines</A>
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HREF="node52.html">Computational routines</A>
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<B> Previous:</B> <A NAME="tex2html1091"
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HREF="node67.html">psb_gediv Entrywise</A>
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<B> <A NAME="tex2html1097"
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HREF="node1.html">Contents</A></B>
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<H2><A NAME="SECTION000516000000000000000">
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psb_geinv -- Entrywise Inversion</A>
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</H2>
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<P>
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This function computes the entrywise inverse of a vector <SPAN CLASS="MATH"><IMG
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img20.png"
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ALT="$x$"></SPAN> and puts it into
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<SPAN CLASS="MATH"><IMG
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WIDTH="12" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img21.png"
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ALT="$y$"></SPAN>
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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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/ \leftarrow 1/x(i).
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\end{displaymath}
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-->
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<IMG
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WIDTH="77" HEIGHT="29" BORDER="0"
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SRC="img63.png"
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ALT="\begin{displaymath}/ \leftarrow 1/x(i).\end{displaymath}">
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</DIV>
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<BR CLEAR="ALL">
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<P></P>
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<P>
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<PRE>
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psb_geinv(x, y, desc_a, info, [flag)
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</PRE>
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<BR><P></P>
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<DIV ALIGN="CENTER"><A NAME="2145"></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> <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="12" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img61.png"
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ALT="$/$"></SPAN>, <SPAN CLASS="MATH"><IMG
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img20.png"
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ALT="$x$"></SPAN>, <SPAN CLASS="MATH"><IMG
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WIDTH="12" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img21.png"
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ALT="$y$"></SPAN></TD>
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<TD ALIGN="LEFT"><B>Function</B></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_geinv</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_geinv</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_geinv</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_geinv</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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<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>x</STRONG></DT>
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<DD>the local portion of global dense vector
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<SPAN CLASS="MATH"><IMG
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img20.png"
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ALT="$x$"></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>in</B>.
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<BR>
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Specified as: an object of type vdata<TT>psb_T_vect_type</TT>
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containing numbers of type specified in
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Table <A HREF="#tab:f90dot">2</A>.
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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: an object of type descdata<TT>psb_desc_type</TT>.
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</DD>
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<DT><STRONG>flag</STRONG></DT>
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<DD>check if any of the <SPAN CLASS="MATH"><IMG
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WIDTH="60" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img64.png"
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ALT="$x(i) = 0$"></SPAN>, and in case returns error halting the computation.
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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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Intent: <B>in</B>.
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<BR>
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Specified as: the logical value <code>flag=.true.</code>
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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>y</STRONG></DT>
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<DD>the local portion of result submatrix <SPAN CLASS="MATH"><IMG
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img20.png"
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ALT="$x$"></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: 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:f90inv">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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<B> Up:</B> <A NAME="tex2html1095"
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HREF="node52.html">Computational routines</A>
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HREF="node67.html">psb_gediv Entrywise</A>
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