SRC/dlascl.f(3)

NAME
SRC/dlascl.f

SYNOPSIS

  Functions/Subroutines
subroutine dlascl (type, kl, ku, cfrom, cto, m, n, a, lda, info)
DLASCL multiplies a general rectangular matrix by a real scalar defined as cto/cfrom.

Function/Subroutine Documentation

  subroutine dlascl (character type, integer kl, integer ku, double precision cfrom, double precision cto, integer m, integer n, double precision, dimension( lda, * ) a, integer lda, integer info)

DLASCL multiplies a general rectangular matrix by a real scalar defined as cto/cfrom.

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.

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 DGBTRF 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 DOUBLE PRECISION

    CTO

              CTO is 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

              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 DOUBLE PRECISION 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 dlascl.f.

Author

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