slascl(3)

NAME

SLASCL - multiplie the M by N real matrix A by the real

scalar CTO/CFROM

SYNOPSIS

SUBROUTINE SLASCL( TYPE, KL, KU, CFROM, CTO, M, N, A, LDA,
INFO )
    CHARACTER      TYPE
    INTEGER        INFO, KL, KU, LDA, M, N
    REAL           CFROM, CTO
    REAL           A( LDA, * )

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.

ARGUMENTS

TYPE (input) 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.

KL (input) INTEGER

The lower bandwidth of A. Referenced only if TYPE

= 'B',

KU (input) INTEGER

The upper bandwidth of A. Referenced only if TYPE

= 'B',

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/under

flow. 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) REAL array, dimension (LDA,M)

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.

LAPACK version 3.0 15 June 2000

SLASCL(3)