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258 lines
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<TITLE>psb_sp_getrow -- Extract row(s) from a sparse matrix</TITLE>
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<H2><A NAME="SECTION000725000000000000000">
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psb_sp_getrow -- Extract row(s) from a sparse matrix</A>
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</H2>
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<P>
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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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<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 <IMG
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WIDTH="29" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img107.png"
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ALT="$>0$">.
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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_spmat_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 <IMG
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WIDTH="29" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img107.png"
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ALT="$>0$">. 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 <IMG
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WIDTH="29" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img107.png"
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ALT="$>0$">, default: <IMG
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WIDTH="31" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img108.png"
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ALT="$row$">.
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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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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>The output <IMG
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WIDTH="22" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img99.png"
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ALT="$nz$"> 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 <IMG
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WIDTH="74" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img109.png"
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ALT="$nzin+nz$">, 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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<P>
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