clascl (l) - Linux Manuals

clascl: multiplies the M by N complex matrix A by the real scalar CTO/CFROM

NAME

CLASCL - multiplies the M by N complex matrix A by the real scalar CTO/CFROM

SYNOPSIS

SUBROUTINE CLASCL(
TYPE, KL, KU, CFROM, CTO, M, N, A, LDA, INFO )

    
CHARACTER TYPE

    
INTEGER INFO, KL, KU, LDA, M, N

    
REAL CFROM, CTO

    
COMPLEX A( LDA, * )

PURPOSE

CLASCL multiplies the M by N complex matrix A by the real scalar CTO/CFROM. This is done without over/underflow as long as the final result CTO*A(I,J)/CFROM does not over/underflow. TYPE specifies that A may be full, upper triangular, lower triangular, upper Hessenberg, or banded.

ARGUMENTS

TYPE (input) CHARACTER*1
TYPE indices the storage type of the input matrix. = aqGaq: A is a full matrix.
= aqLaq: A is a lower triangular matrix.
= aqUaq: A is an upper triangular matrix.
= aqHaq: A is an upper Hessenberg matrix.
= aqBaq: A is a symmetric band matrix with lower bandwidth KL and upper bandwidth KU and with the only the lower half stored. = aqQaq: A is a symmetric band matrix with lower bandwidth KL and upper bandwidth KU and with the only the upper half stored. = aqZaq: A is a band matrix with lower bandwidth KL and upper bandwidth KU.
KL (input) INTEGER
The lower bandwidth of A. Referenced only if TYPE = aqBaq, aqQaq or aqZaq.
KU (input) INTEGER
The upper bandwidth of A. Referenced only if TYPE = aqBaq, aqQaq or aqZaq.
CFROM (input) REAL
CTO (input) REAL The matrix A is multiplied by CTO/CFROM. A(I,J) is computed without over/underflow if the final result CTO*A(I,J)/CFROM can be represented without over/underflow. CFROM must be nonzero.
M (input) INTEGER
The number of rows of the matrix A. M >= 0.
N (input) INTEGER
The number of columns of the matrix A. N >= 0.
A (input/output) COMPLEX array, dimension (LDA,N)
The matrix to be multiplied by CTO/CFROM. See TYPE for the storage type.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,M).
INFO (output) INTEGER
0 - successful exit <0 - if INFO = -i, the i-th argument had an illegal value.

Pages related to clascl

  • clascl (3)
  • clascl2 (l) - performs a diagonal scaling on a vector
  • claset (l) - initializes a 2-D array A to BETA on the diagonal and ALPHA on the offdiagonals
  • clasr (l) - applies a sequence of real plane rotations to a complex matrix A, from either the left or the right
  • classq (l) - returns the values scl and ssq such that ( scl**2 )*ssq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,
  • claswp (l) - performs a series of row interchanges on the matrix A
  • clasyf (l) - computes a partial factorization of a complex symmetric matrix A using the Bunch-Kaufman diagonal pivoting method
  • cla_gbamv (l) - performs one of the matrix-vector operations y := alpha*abs(A)*abs(x) + beta*abs(y),