clantr (l)  Linux Man Pages
clantr: 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
NAME
CLANTR  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 ASYNOPSIS
 REAL FUNCTION
 CLANTR( NORM, UPLO, DIAG, M, N, A, LDA, WORK )
 CHARACTER DIAG, NORM, UPLO
 INTEGER LDA, M, N
 REAL WORK( * )
 COMPLEX A( LDA, * )
PURPOSE
CLANTR 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
CLANTR returns the valueCLANTR
ARGUMENTS
 NORM (input) CHARACTER*1
 Specifies the value to be returned in CLANTR as described above.
 UPLO (input) CHARACTER*1

Specifies whether the matrix A is upper or lower trapezoidal.
= aqUaq: Upper trapezoidal
= aqLaq: 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.
= aqNaq: Nonunit diagonal
= aqUaq: Unit diagonal  M (input) INTEGER
 The number of rows of the matrix A. M >= 0, and if UPLO = aqUaq, M <= N. When M = 0, CLANTR is set to zero.
 N (input) INTEGER
 The number of columns of the matrix A. N >= 0, and if UPLO = aqLaq, N <= M. When N = 0, CLANTR is set to zero.
 A (input) COMPLEX array, dimension (LDA,N)
 The trapezoidal matrix A (A is triangular if M = N). If UPLO = aqUaq, 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 = aqLaq, 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 = aqUaq, 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) REAL array, dimension (MAX(1,LWORK)),

where LWORK >= M when NORM = aqIaq; otherwise, WORK is not
referenced.