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113 lines
3.0 KiB
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113 lines
3.0 KiB
HTML
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<TITLE>tril -- Return the lower triangle</TITLE>
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<H3><A NAME="SECTION000421400000000000000">
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tril -- Return the lower triangle</A>
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<PRE>
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call a%tril(b,info[,&
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& diag,imin,imax,jmin,jmax,rscale,cscale])
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</PRE>
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<P>
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Returns the lower triangular part of submatrix
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<code>A(imin:imax,jmin:jmax)</code>, optionally rescaling row/col indices to
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the range <code>1:imax-imin+1,1:jmax-jmin+1</code>.
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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>a</STRONG></DT>
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<DD>the sparse matrix.
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<BR>
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A variable of type <code>psb_Tspmat_type</code>.
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<BR>
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Scope: <B>local</B>.
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<BR></DD>
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<DT><STRONG>diag</STRONG></DT>
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<DD>How many additional diagonals above the main one, default 0.
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</DD>
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<DT><STRONG>imin,imax,jmin,jmax</STRONG></DT>
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<DD>Minimum and maximum row and column indices.
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<BR>
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Type: optional.
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</DD>
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<DT><STRONG>rscale,cscale</STRONG></DT>
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<DD>Whether to rescale row/column indices.
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Type: optional.
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</DD>
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</DL>
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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>b</STRONG></DT>
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<DD>A copy of a subtriangle of <code>a</code>.
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<BR>
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A variable of type <code>psb_Tspmat_type</code>.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Return code.
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</DD>
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</DL>
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