---
name: "dlascl"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/dlascl/3lapack"
---

# dlascl(3lapack)

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

## NAME

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

## SYNOPSIS

- SUBROUTINE DLASCL(

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

- CHARACTER

  TYPE

- INTEGER

  INFO, KL, KU, LDA, M, N

- DOUBLE

  PRECISION CFROM, CTO

- DOUBLE

  PRECISION A( LDA, \* )

## PURPOSE

DLASCL 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', 'Q' or 'Z'.

- KU (input) INTEGER

  The upper bandwidth of A.  Referenced only if TYPE = 'B', 'Q' or 'Z'.

- CFROM (input) DOUBLE PRECISION

  CTO     (input) DOUBLE PRECISION 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) DOUBLE PRECISION 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.