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Added entrywise inversion and documentation for vec-vec operation
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<TITLE>Parallel environment routines</TITLE>
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<TITLE>psb_sp_getrow -- Extract row(s) from a sparse matrix</TITLE>
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HREF="node100.html">psb_init Initializes</A>
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HREF="node100.html">psb_sizeof Memory</A>
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HREF="node74.html">Data management routines</A>
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HREF="node98.html">psb_get_overlap Extract</A>
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<B> <A NAME="tex2html1498"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR></DIV>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION00080000000000000000"></A>
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<A NAME="sec:parenv"></A>
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<BR>
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Parallel environment routines
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</H1>
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<H2><A NAME="SECTION000725000000000000000">
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psb_sp_getrow -- Extract row(s) from a sparse
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matrix</A>
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</H2>
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<P>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<PRE>
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call psb_sp_getrow(row, a, nz, ia, ja, val, info, &
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& append, nzin, lrw)
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</PRE>
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<UL CLASS="ChildLinks">
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<LI><A NAME="tex2html1490"
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HREF="node100.html">psb_init -- Initializes PSBLAS parallel
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environment</A>
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<LI><A NAME="tex2html1491"
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HREF="node101.html">psb_info -- Return information about PSBLAS parallel
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environment</A>
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<LI><A NAME="tex2html1492"
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HREF="node102.html">psb_exit -- Exit from PSBLAS parallel
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environment</A>
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<LI><A NAME="tex2html1493"
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HREF="node103.html">psb_get_mpicomm -- Get the MPI communicator</A>
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<LI><A NAME="tex2html1494"
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HREF="node104.html">psb_get_rank -- Get the MPI rank</A>
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<LI><A NAME="tex2html1495"
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HREF="node105.html">psb_wtime -- Wall clock timing</A>
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<LI><A NAME="tex2html1496"
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HREF="node106.html">psb_barrier -- Sinchronization point parallel
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environment</A>
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<LI><A NAME="tex2html1497"
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HREF="node107.html">psb_abort -- Abort a computation</A>
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<LI><A NAME="tex2html1498"
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HREF="node108.html">psb_bcast -- Broadcast data</A>
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<LI><A NAME="tex2html1499"
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HREF="node109.html">psb_sum -- Global sum</A>
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<LI><A NAME="tex2html1500"
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HREF="node110.html">psb_max -- Global maximum</A>
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<LI><A NAME="tex2html1501"
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HREF="node111.html">psb_min -- Global minimum</A>
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<LI><A NAME="tex2html1502"
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HREF="node112.html">psb_amx -- Global maximum absolute value</A>
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<LI><A NAME="tex2html1503"
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HREF="node113.html">psb_amn -- Global minimum absolute value</A>
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HREF="node114.html">psb_nrm2 -- Global 2-norm reduction</A>
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<LI><A NAME="tex2html1505"
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HREF="node115.html">psb_snd -- Send data</A>
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<LI><A NAME="tex2html1506"
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HREF="node116.html">psb_rcv -- Receive data</A>
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</UL>
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<BR><HR>
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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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>row</STRONG></DT>
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<DD>The (first) row to be extracted.
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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 integer <SPAN CLASS="MATH"><IMG
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WIDTH="29" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img126.png"
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ALT="$>0$"></SPAN>.
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</DD>
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<DT><STRONG>a</STRONG></DT>
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<DD>the matrix from which to get rows.
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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 spdata<TT>psb_Tspmat_type</TT>.
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</DD>
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<DT><STRONG>append</STRONG></DT>
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<DD>Whether to append or overwrite existing output.
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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: a logical value default: false (overwrite).
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</DD>
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<DT><STRONG>nzin</STRONG></DT>
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<DD>Input size to be appended to.
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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 integer <SPAN CLASS="MATH"><IMG
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WIDTH="29" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img126.png"
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ALT="$>0$"></SPAN>. When append is true, specifies how many
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entries in the output vectors are already filled.
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</DD>
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<DT><STRONG>lrw</STRONG></DT>
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<DD>The last row to be extracted.
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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 integer <SPAN CLASS="MATH"><IMG
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WIDTH="29" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img126.png"
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ALT="$>0$"></SPAN>, default: <SPAN CLASS="MATH"><IMG
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WIDTH="31" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img127.png"
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ALT="$row$"></SPAN>.
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<P>
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</DD>
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</DL>
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<P>
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<DL>
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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>nz</STRONG></DT>
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<DD>the number of elements returned by this call.
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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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Returned as: an integer scalar.
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</DD>
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<DT><STRONG>ia</STRONG></DT>
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<DD>the row indices.
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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>inout</B>.
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<BR>
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Specified as: an integer array with the <code>ALLOCATABLE</code> attribute.
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</DD>
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<DT><STRONG>ja</STRONG></DT>
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<DD>the column indices of the elements to be inserted.
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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>inout</B>.
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<BR>
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Specified as: an integer array with the <code>ALLOCATABLE</code> attribute.
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</DD>
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<DT><STRONG>val</STRONG></DT>
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<DD>the elements to be inserted.
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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>inout</B>.
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<BR>
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Specified as: a real array with the <code>ALLOCATABLE</code> attribute.
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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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<P>
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<BIG CLASS="LARGE"><B>Notes</B></BIG>
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<OL>
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<LI>The output <SPAN CLASS="MATH"><IMG
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WIDTH="21" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img111.png"
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ALT="$nz$"></SPAN> is always the size of the output generated by
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the current call; thus, if <code>append=.true.</code>, the total output
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size will be <SPAN CLASS="MATH"><IMG
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WIDTH="74" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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SRC="img128.png"
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ALT="$nzin+nz$"></SPAN>, with the newly extracted coefficients stored in
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entries <code>nzin+1:nzin+nz</code> of the array arguments;
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</LI>
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<LI>When <code>append=.true.</code> the output arrays are reallocated as
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necessary;
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</LI>
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<LI>The row and column indices are returned in the local numbering
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scheme; if the global numbering is desired, the user may employ the
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<code>psb_loc_to_glob</code> routine on the output.
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</LI>
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</OL>
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