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<meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
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<title>SuperLU: SRC/dlangs.c File Reference</title>
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Main Page
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Data Structures
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Files
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SRC/dlangs.c File ReferenceReturns the value of the one norm. More...
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#include <math.h>
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#include "slu_ddefs.h"
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Functions
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double dlangs (char *norm, SuperMatrix *A)
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Detailed Description
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-- SuperLU routine (version 2.0) --
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Univ. of California Berkeley, Xerox Palo Alto Research Center,
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and Lawrence Berkeley National Lab.
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November 15, 1997
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Modified from lapack routine DLANGE
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Function Documentation
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double dlangs
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(
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char *
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norm,
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SuperMatrix *
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A
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)
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Purpose
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=======
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DLANGS returns the value of the one norm, or the Frobenius norm, or
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the infinity norm, or the element of largest absolute value of a
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real matrix A.
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Description
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===========
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DLANGE returns the value
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DLANGE = ( max(abs(A(i,j))), NORM = 'M' or 'm'
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(
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( norm1(A), NORM = '1', 'O' or 'o'
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(
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( normI(A), NORM = 'I' or 'i'
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(
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( normF(A), NORM = 'F', 'f', 'E' or 'e'
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where norm1 denotes the one norm of a matrix (maximum column sum),
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normI denotes the infinity norm of a matrix (maximum row sum) and
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normF denotes the Frobenius norm of a matrix (square root of sum of
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squares). Note that max(abs(A(i,j))) is not a matrix norm.
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Arguments
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=========
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NORM (input) CHARACTER*1
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Specifies the value to be returned in DLANGE as described above.
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A (input) SuperMatrix*
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The M by N sparse matrix A.
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=====================================================================
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<address style="text-align: right;"><small>Generated on Mon Nov 22 10:23:47 2010 for SuperLU by </small></address>
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 1.5.5
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