TESTING/MATGEN/slagsy.f(3)

NAME
TESTING/MATGEN/slagsy.f

SYNOPSIS

  Functions/Subroutines
subroutine slagsy (n, k, d, a, lda, iseed, work, info)
SLAGSY

Function/Subroutine Documentation

  subroutine slagsy (integer n, integer k, real, dimension( * ) d, real, dimension( lda, * ) a, integer lda, integer, dimension( 4 ) iseed, real, dimension( * ) work, integer info)

SLAGSY

Purpose:

     SLAGSY generates a real symmetric matrix A, by pre- and post-
     multiplying a real diagonal matrix D with a random orthogonal matrix:
     A = U*D*U'. The semi-bandwidth may then be reduced to k by additional
     orthogonal transformations.

Parameters
    N

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

    K

              K is INTEGER
              The number of nonzero subdiagonals within the band of A.
              0 <= K <= N-1.

    D

              D is REAL array, dimension (N)
              The diagonal elements of the diagonal matrix D.

    A

              A is REAL array, dimension (LDA,N)
              The generated n by n symmetric matrix A (the full matrix is
              stored).

    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 REAL 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 100 of file slagsy.f.

Author

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