slarhs.f3

!>
!> SLARHS chooses a set of NRHS random solution vectors and sets
!> up the right hand sides for the linear system
!>    op(A) * X = B,
!> where op(A) = A or A**T, depending on TRANS.
!> 

PATH

!>          PATH is CHARACTER*3
!>          The type of the real matrix A.  PATH may be given in any
!>          combination of upper and lower case.  Valid types include
!>             xGE:  General m x n matrix
!>             xGB:  General banded matrix
!>             xPO:  Symmetric positive definite, 2-D storage
!>             xPP:  Symmetric positive definite packed
!>             xPB:  Symmetric positive definite banded
!>             xSY:  Symmetric indefinite, 2-D storage
!>             xSP:  Symmetric indefinite packed
!>             xSB:  Symmetric indefinite banded
!>             xTR:  Triangular
!>             xTP:  Triangular packed
!>             xTB:  Triangular banded
!>             xQR:  General m x n matrix
!>             xLQ:  General m x n matrix
!>             xQL:  General m x n matrix
!>             xRQ:  General m x n matrix
!>          where the leading character indicates the precision.
!> 

XTYPE

!>          XTYPE is CHARACTER*1
!>          Specifies how the exact solution X will be determined:
!>          = 'N':  New solution; generate a random X.
!>          = 'C':  Computed; use value of X on entry.
!> 

UPLO

!>          UPLO is CHARACTER*1
!>          Specifies whether the upper or lower triangular part of the
!>          matrix A is stored, if A is symmetric.
!>          = 'U':  Upper triangular
!>          = 'L':  Lower triangular
!> 

TRANS

!>          TRANS is CHARACTER*1
!>          Used only if A is nonsymmetric; specifies the operation
!>          applied to the matrix A.
!>          = 'N':  B := A    * X  (No transpose)
!>          = 'T':  B := A**T * X  (Transpose)
!>          = 'C':  B := A**H * X  (Conjugate transpose = Transpose)
!> 

M

!>          M is INTEGER
!>          The number or 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
!>          Used only if A is a band matrix; specifies the number of
!>          subdiagonals of A if A is a general band matrix or if A is
!>          symmetric or triangular and UPLO = 'L'; specifies the number
!>          of superdiagonals of A if A is symmetric or triangular and
!>          UPLO = 'U'.  0 <= KL <= M-1.
!> 

KU

!>          KU is INTEGER
!>          Used only if A is a general band matrix or if A is
!>          triangular.
!>
!>          If PATH = xGB, specifies the number of superdiagonals of A,
!>          and 0 <= KU <= N-1.
!>
!>          If PATH = xTR, xTP, or xTB, specifies whether or not the
!>          matrix has unit diagonal:
!>          = 1:  matrix has non-unit diagonal (default)
!>          = 2:  matrix has unit diagonal
!> 

NRHS

!>          NRHS is INTEGER
!>          The number of right hand side vectors in the system A*X = B.
!> 

A

!>          A is REAL array, dimension (LDA,N)
!>          The test matrix whose type is given by PATH.
!> 

LDA

!>          LDA is INTEGER
!>          The leading dimension of the array A.
!>          If PATH = xGB, LDA >= KL+KU+1.
!>          If PATH = xPB, xSB, xHB, or xTB, LDA >= KL+1.
!>          Otherwise, LDA >= max(1,M).
!> 

X

!>          X is or output) REAL array, dimension(LDX,NRHS)
!>          On entry, if XTYPE = 'C' (for 'Computed'), then X contains
!>          the exact solution to the system of linear equations.
!>          On exit, if XTYPE = 'N' (for 'New'), then X is initialized
!>          with random values.
!> 

LDX

!>          LDX is INTEGER
!>          The leading dimension of the array X.  If TRANS = 'N',
!>          LDX >= max(1,N); if TRANS = 'T', LDX >= max(1,M).
!> 

B

!>          B is REAL array, dimension (LDB,NRHS)
!>          The right hand side vector(s) for the system of equations,
!>          computed from B = op(A) * X, where op(A) is determined by
!>          TRANS.
!> 

LDB

!>          LDB is INTEGER
!>          The leading dimension of the array B.  If TRANS = 'N',
!>          LDB >= max(1,M); if TRANS = 'T', LDB >= max(1,N).
!> 

ISEED

!>          ISEED is INTEGER array, dimension (4)
!>          The seed vector for the random number generator (used in
!>          SLATMS).  Modified on exit.
!> 

INFO

!>          INFO is INTEGER
!>          = 0: successful exit
!>          < 0: if INFO = -i, the i-th argument had an illegal value
!> 

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