slascl.f3
Usage
Functions/Subroutines
subroutine slascl (type, kl, ku, cfrom, cto, m, n, a, lda, info)
SLASCL multiplies a general rectangular matrix by a real scalar defined as cto/cfrom.
Function/Subroutine Documentation
subroutine slascl (character type, integer kl, integer ku, real cfrom, real cto, integer m, integer n, real, dimension( lda, * ) a, integer lda, integer info)
SLASCL multiplies a general rectangular matrix by a real scalar defined as cto/cfrom.
Purpose:
!> !> SLASCL multiplies the M by N real 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. !>
Parameters
TYPE
!> TYPE is CHARACTER*1 !> TYPE indices the storage type of the input matrix. !> = 'G': A is a full matrix. !> = 'L': A is a lower triangular matrix. !> = 'U': A is an upper triangular matrix. !> = 'H': A is an upper Hessenberg matrix. !> = 'B': A is a symmetric band matrix with lower bandwidth KL !> and upper bandwidth KU and with the only the lower !> half stored. !> = 'Q': A is a symmetric band matrix with lower bandwidth KL !> and upper bandwidth KU and with the only the upper !> half stored. !> = 'Z': A is a band matrix with lower bandwidth KL and upper !> bandwidth KU. See SGBTRF for storage details. !>
KL
!> KL is INTEGER !> The lower bandwidth of A. Referenced only if TYPE = 'B', !> 'Q' or 'Z'. !>
KU
!> KU is INTEGER !> The upper bandwidth of A. Referenced only if TYPE = 'B', !> 'Q' or 'Z'. !>
CFROM
!> CFROM is REAL !>
CTO
!> CTO is 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
!> M is INTEGER !> The number of rows of the matrix A. M >= 0. !>
N
!> N is INTEGER !> The number of columns of the matrix A. N >= 0. !>
A
!> A is REAL array, dimension (LDA,N) !> The matrix to be multiplied by CTO/CFROM. See TYPE for the !> storage type. !>
LDA
!> LDA is INTEGER !> The leading dimension of the array A. !> If TYPE = 'G', 'L', 'U', 'H', LDA >= max(1,M); !> TYPE = 'B', LDA >= KL+1; !> TYPE = 'Q', LDA >= KU+1; !> TYPE = 'Z', LDA >= 2*KL+KU+1. !>
INFO
!> INFO is INTEGER !> 0 - successful exit !> <0 - if INFO = -i, the i-th argument had an illegal value. !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 142 of file slascl.f.
Releases
4 releases since Debian 7 (Wheezy); the text changed 3 times.