TESTING/LIN/sqrt15.f(3)

NAME
TESTING/LIN/sqrt15.f

SYNOPSIS

  Functions/Subroutines
subroutine sqrt15 (scale, rksel, m, n, nrhs, a, lda, b, ldb, s, rank, norma, normb, iseed, work, lwork)
SQRT15

Function/Subroutine Documentation

  subroutine sqrt15 (integer scale, integer rksel, integer m, integer n, integer nrhs, real, dimension( lda, * ) a, integer lda, real, dimension( ldb, * ) b, integer ldb, real, dimension( * ) s, integer rank, real norma, real normb, integer, dimension( 4 ) iseed, real, dimension( lwork ) work, integer lwork)

SQRT15

Purpose:

    !>
    !> SQRT15 generates a matrix with full or deficient rank and of various
    !> norms.
    !>

Parameters
    SCALE

    !>          SCALE is INTEGER
    !>          SCALE = 1: normally scaled matrix
    !>          SCALE = 2: matrix scaled up
    !>          SCALE = 3: matrix scaled down
    !>

    RKSEL

    !>          RKSEL is INTEGER
    !>          RKSEL = 1: full rank matrix
    !>          RKSEL = 2: rank-deficient matrix
    !>

    M

    !>          M is INTEGER
    !>          The number of rows of the matrix A.
    !>

    N

    !>          N is INTEGER
    !>          The number of columns of A.
    !>

    NRHS

    !>          NRHS is INTEGER
    !>          The number of columns of B.
    !>

    A

    !>          A is REAL array, dimension (LDA,N)
    !>          The M-by-N matrix A.
    !>

    LDA

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

    B

    !>          B is REAL array, dimension (LDB, NRHS)
    !>          A matrix that is in the range space of matrix A.
    !>

    LDB

    !>          LDB is INTEGER
    !>          The leading dimension of the array B.
    !>

    S

    !>          S is REAL array, dimension MIN(M,N)
    !>          Singular values of A.
    !>

    RANK

    !>          RANK is INTEGER
    !>          number of nonzero singular values of A.
    !>

    NORMA

    !>          NORMA is REAL
    !>          one-norm of A.
    !>

    NORMB

    !>          NORMB is REAL
    !>          one-norm of B.
    !>

    ISEED

    !>          ISEED is integer array, dimension (4)
    !>          seed for random number generator.
    !>

    WORK

    !>          WORK is REAL array, dimension (LWORK)
    !>

    LWORK

    !>          LWORK is INTEGER
    !>          length of work space required.
    !>          LWORK >= MAX(M+MIN(M,N),NRHS*MIN(M,N),2*N+M)
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 146 of file sqrt15.f.

Author

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