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<HTML>
<HEAD><TITLE>MA02MD - SLICOT Library Routine Documentation</TITLE>
</HEAD>
<BODY>
<H2><A Name="MA02MD">MA02MD</A></H2>
<H3>
Compute norms of a real skew-symmetric matrix
</H3>
<A HREF ="#Specification"><B>[Specification]</B></A>
<A HREF ="#Arguments"><B>[Arguments]</B></A>
<A HREF ="#Method"><B>[Method]</B></A>
<A HREF ="#References"><B>[References]</B></A>
<A HREF ="#Comments"><B>[Comments]</B></A>
<A HREF ="#Example"><B>[Example]</B></A>
<P>
<B><FONT SIZE="+1">Purpose</FONT></B>
<PRE>
To compute the value of the one norm, or the Frobenius norm, or
the infinity norm, or the element of largest absolute value
of a real skew-symmetric matrix.
Note that for this kind of matrices the infinity norm is equal
to the one norm.
</PRE>
<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
<PRE>
DOUBLE PRECISION FUNCTION MA02MD( NORM, UPLO, N, A, LDA, DWORK )
C .. Scalar Arguments ..
CHARACTER NORM, UPLO
INTEGER LDA, N
C .. Array Arguments ..
DOUBLE PRECISION A( LDA, * ), DWORK( * )
</PRE>
<B><FONT SIZE="+1">Function Value</FONT></B>
<PRE>
MA02MD DOUBLE PRECISION
The computed norm.
</PRE>
<A name="Arguments"><B><FONT SIZE="+1">Arguments</FONT></B></A>
<P>
<B>Mode Parameters</B>
<PRE>
NORM CHARACTER*1
Specifies the value to be returned in MA02MD:
= '1' or 'O': one norm of A;
= 'F' or 'E': Frobenius norm of A;
= 'I': infinity norm of A;
= 'M': max(abs(A(i,j)).
UPLO CHARACTER*1
Specifies whether the upper or lower triangular part of
the skew-symmetric matrix A is to be referenced.
= 'U': Upper triangular part of A is referenced;
= 'L': Lower triangular part of A is referenced.
</PRE>
<B>Input/Output Parameters</B>
<PRE>
N (input) INTEGER
The order of the matrix A. N >= 0. When N = 0, MA02MD is
set to zero.
A (input) DOUBLE PRECISION array, dimension (LDA,N)
The skew-symmetric matrix A. If UPLO = 'U', the leading
N-by-N strictly upper triangular part of A contains the
strictly upper triangular part of the matrix A, and the
lower triangular part of A is not referenced.
If UPLO = 'L', the leading N-by-N strictly lower
triangular part of A contains the strictly lower
triangular part of the matrix A, and the upper triangular
part of A is not referenced.
The diagonal of A need not be set to zero.
LDA INTEGER
The leading dimension of the array A. LDA >= max(1,N).
</PRE>
<B>Workspace</B>
<PRE>
DWORK DOUBLE PRECISION array, dimension (MAX(1,LDWORK)),
where LDWORK >= N when NORM = 'I' or '1' or 'O';
otherwise, DWORK is not referenced.
</PRE>
<A name="Comments"><B><FONT SIZE="+1">Further Comments</FONT></B></A>
<PRE>
None
</PRE>
<A name="Example"><B><FONT SIZE="+1">Example</FONT></B></A>
<P>
<B>Program Text</B>
<PRE>
None
</PRE>
<B>Program Data</B>
<PRE>
None
</PRE>
<B>Program Results</B>
<PRE>
None
</PRE>
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