dlarge.f - Man Page

subroutine dlarge (n, a, lda, iseed, work, info)
DLARGE

DLARGE

Purpose:

 DLARGE pre- and post-multiplies a real general n by n matrix A
 with a random orthogonal matrix: A = U*D*U'.

Parameters

N

          N is INTEGER
          The order of the matrix A.  N >= 0.

A

          A is DOUBLE PRECISION array, dimension (LDA,N)
          On entry, the original n by n matrix A.
          On exit, A is overwritten by U*A*U' for some random
          orthogonal matrix U.

LDA

          LDA is INTEGER
          The leading dimension of the array A.  LDA >= N.

ISEED

          ISEED is INTEGER array, dimension (4)
          On entry, the seed of the random number generator; the array
          elements must be between 0 and 4095, and ISEED(4) must be
          odd.
          On exit, the seed is updated.

WORK

          WORK is DOUBLE PRECISION array, dimension (2*N)

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 86 of file dlarge.f.