TESTING/MATGEN/dlagge.f(3) | Library Functions Manual | TESTING/MATGEN/dlagge.f(3) |
NAME
TESTING/MATGEN/dlagge.f
SYNOPSIS
Functions/Subroutines
subroutine dlagge (m, n, kl, ku, d, a, lda, iseed, work,
info)
DLAGGE
Function/Subroutine Documentation
subroutine dlagge (integer m, integer n, integer kl, integer ku, double precision, dimension( * ) d, double precision, dimension( lda, * ) a, integer lda, integer, dimension( 4 ) iseed, double precision, dimension( * ) work, integer info)
DLAGGE
Purpose:
DLAGGE generates a real general m by n matrix A, by pre- and post- multiplying a real diagonal matrix D with random orthogonal matrices: A = U*D*V. The lower and upper bandwidths may then be reduced to kl and ku by additional orthogonal transformations.
Parameters
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.
KL
KL is INTEGER The number of nonzero subdiagonals within the band of A. 0 <= KL <= M-1.
KU
KU is INTEGER The number of nonzero superdiagonals within the band of A. 0 <= KU <= N-1.
D
D is DOUBLE PRECISION array, dimension (min(M,N)) The diagonal elements of the diagonal matrix D.
A
A is DOUBLE PRECISION array, dimension (LDA,N) The generated m by n matrix A.
LDA
LDA is INTEGER The leading dimension of the array A. LDA >= M.
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 (M+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 112 of file dlagge.f.
Author
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