dlantr man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

DLANTR(l)			       )			     DLANTR(l)

NAME
       DLANTR  -  return  the value of the one norm, or the Frobenius norm, or
       the infinity norm, or the element of largest absolute value of a trape‐
       zoidal or triangular matrix A

SYNOPSIS
       DOUBLE PRECISION FUNCTION  DLANTR( NORM, UPLO, DIAG, M, N, A, LDA, WORK
			)

	   CHARACTER	DIAG, NORM, UPLO

	   INTEGER	LDA, M, N

	   DOUBLE	PRECISION A( LDA, * ), WORK( * )

PURPOSE
       DLANTR returns the value of the one norm, or the Frobenius norm, or the
       infinity	 norm,	or  the	 element of largest absolute value of a trape‐
       zoidal or triangular matrix A.

DESCRIPTION
       DLANTR returns the value

	  DLANTR = ( max(abs(A(i,j))), NORM = 'M' or 'm'
		   (
		   ( norm1(A),	       NORM = '1', 'O' or 'o'
		   (
		   ( normI(A),	       NORM = 'I' or 'i'
		   (
		   ( normF(A),	       NORM = 'F', 'f', 'E' or 'e'

       where  norm1  denotes the  one norm of a matrix (maximum	 column	 sum),
       normI   denotes	the  infinity norm  of a matrix	 (maximum row sum) and
       normF  denotes the  Frobenius norm of a matrix (square root of  sum  of
       squares).  Note that  max(abs(A(i,j)))  is not a	 matrix norm.

ARGUMENTS
       NORM    (input) CHARACTER*1
	       Specifies  the  value  to  be  returned	in DLANTR as described
	       above.

       UPLO    (input) CHARACTER*1
	       Specifies whether the matrix A is upper or  lower  trapezoidal.
	       = 'U':  Upper trapezoidal
	       =  'L':	Lower trapezoidal Note that A is triangular instead of
	       trapezoidal if M = N.

       DIAG    (input) CHARACTER*1
	       Specifies whether or not the matrix A  has  unit	 diagonal.   =
	       'N':  Non-unit diagonal
	       = 'U':  Unit diagonal

       M       (input) INTEGER
	       The number of rows of the matrix A.  M >= 0, and if UPLO = 'U',
	       M <= N.	When M = 0, DLANTR is set to zero.

       N       (input) INTEGER
	       The number of columns of the matrix A.  N >= 0, and if  UPLO  =
	       'L', N <= M.  When N = 0, DLANTR is set to zero.

       A       (input) DOUBLE PRECISION array, dimension (LDA,N)
	       The trapezoidal matrix A (A is triangular if M = N).  If UPLO =
	       'U', the leading m by n upper trapezoidal part of the  array  A
	       contains	 the  upper trapezoidal matrix, and the strictly lower
	       triangular part of A is not referenced.	If  UPLO  =  'L',  the
	       leading	m  by n lower trapezoidal part of the array A contains
	       the lower trapezoidal matrix, and the strictly upper triangular
	       part  of	 A  is not referenced.	Note that when DIAG = 'U', the
	       diagonal elements of A are not referenced and are assumed to be
	       one.

       LDA     (input) INTEGER
	       The leading dimension of the array A.  LDA >= max(M,1).

       WORK    (workspace) DOUBLE PRECISION array, dimension (LWORK),
	       where LWORK >= M when NORM = 'I'; otherwise, WORK is not refer‐
	       enced.

LAPACK version 3.0		 15 June 2000			     DLANTR(l)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net