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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD
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Salvatore Filippone
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original version by: Nikos Drakos, CBLU, University of Leeds
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* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
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* with significant contributions from:
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>psb_sizeof -- Memory occupation</TITLE>
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<TITLE>psb_sp_getrow -- Extract row(s) from a sparse matrix</TITLE>
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HREF="node97.html">psb_sizeof Memory</A>
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HREF="node95.html">psb_get_overlap Extract</A>
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HREF="node1.html">Contents</A></B>
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<H2><A NAME="SECTION000726000000000000000">
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psb_sizeof -- Memory occupation</A>
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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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This function computes the memory occupation of a PSBLAS object.
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<P>
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<PRE>
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isz = psb_sizeof(a)
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isz = psb_sizeof(desc_a)
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isz = psb_sizeof(prec)
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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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<P>
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@@ -73,56 +67,190 @@ isz = psb_sizeof(prec)
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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="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img111.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>A sparse matrix
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<IMG
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WIDTH="16" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img1.png"
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ALT="$A$">.
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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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Scope:<B>local</B>
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<BR>
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Type: <B>required</B>
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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>desc_a</STRONG></DT>
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<DD>Communication descriptor.
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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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Scope:<B>local</B>
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<BR>
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Type: <B>required</B>
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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 structured data of type descdata<TT>psb_desc_type</TT>.
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Specified as: a logical value default: false (overwrite).
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</DD>
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<DT><STRONG>prec</STRONG></DT>
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<DD>Scope: <B>local</B>
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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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Type: <B>required</B>
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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 preconditioner data structure precdata<TT>psb_prec_type</TT>.
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Specified as: an integer <SPAN CLASS="MATH"><IMG
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WIDTH="29" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img111.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><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>Function value</STRONG></DT>
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<DD>The memory occupation of the object specified in
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the calling sequence, in bytes.
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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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Scope:<B>local</B>
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<BR>
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Returned as: an <code>integer(psb_long_int_k_)</code> number.
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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="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img111.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="img112.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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<BR><HR>
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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="22" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img101.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="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img113.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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