dlantr man page on IRIX

Man page or keyword search:  
man Server   31559 pages
apropos Keyword Search (all sections)
Output format
IRIX logo
[printable version]



DLANTR(3F)							    DLANTR(3F)

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 trapezoidal
     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
     trapezoidal 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

									Page 1

DLANTR(3F)							    DLANTR(3F)

     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
	     referenced.

									Page 2

[top]

List of man pages available for IRIX

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