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<H3><A NAME="SECTION000421500000000000000">
tril -- Return the lower triangle</A>
</H3>
<PRE>
call a%tril(l,info[,&amp;
&amp; diag,imin,imax,jmin,jmax,rscale,cscale,u])
</PRE>
<P>
Returns the lower triangular part of submatrix
<code>A(imin:imax,jmin:jmax)</code>, optionally rescaling row/col indices to
the range <code>1:imax-imin+1,1:jmax-jmin+1</code> and returing the
complementary upper triangle.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>a</STRONG></DT>
<DD>the sparse matrix.
<BR>
A variable of type <code>psb_Tspmat_type</code>.
<BR>
Scope: <B>local</B>.
<BR></DD>
<DT><STRONG>diag</STRONG></DT>
<DD>Include diagonals up to this one; <code>diag=1</code> means the
first superdiagonal, <code>diag=-1</code> means the first subdiagonal.
Default 0.
</DD>
<DT><STRONG>imin,imax,jmin,jmax</STRONG></DT>
<DD>Minimum and maximum row and column indices.
<BR>
Type: optional.
</DD>
<DT><STRONG>rscale,cscale</STRONG></DT>
<DD>Whether to rescale row/column indices.
Type: optional.
</DD>
</DL>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>l</STRONG></DT>
<DD>A copy of the lower triangle of <code>a</code>.
<BR>
A variable of type <code>psb_Tspmat_type</code>.
</DD>
<DT><STRONG>u</STRONG></DT>
<DD>(optional) A copy of the upper triangle of <code>a</code>.
<BR>
A variable of type <code>psb_Tspmat_type</code>.
</DD>
<DT><STRONG>info</STRONG></DT>
<DD>Return code.
</DD>
</DL>
<P>
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