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100 lines
2.6 KiB
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100 lines
2.6 KiB
HTML
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<H3><A NAME="SECTION00042900000000000000">
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is_lower, is_upper, is_triangle, is_unit --
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Format check</A>
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</H3>
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<P>
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<PRE>
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if (a%is_triangle()) then
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if (a%is_upper()) then
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if (a%is_lower()) then
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if (a%is_unit()) then
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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>a</STRONG></DT>
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<DD>the sparse matrix
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<BR>
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Scope: <B>local</B>
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<BR></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>Function value</STRONG></DT>
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<DD>A <code>logical</code> value indicating whether the
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matrix is triangular; if <code>is_triangle()</code> returns <code>.true.</code>
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check also if it is lower, upper and with a unit (i.e. assumed)
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diagonal.
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</DD>
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