TESTING/LIN/slattp.f(3) | Library Functions Manual | TESTING/LIN/slattp.f(3) |
NAME
TESTING/LIN/slattp.f
SYNOPSIS
Functions/Subroutines
subroutine slattp (imat, uplo, trans, diag, iseed, n, a, b,
work, info)
SLATTP
Function/Subroutine Documentation
subroutine slattp (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, real, dimension( * ) a, real, dimension( * ) b, real, dimension( * ) work, integer info)
SLATTP
Purpose:
SLATTP generates a triangular test matrix in packed storage. IMAT and UPLO uniquely specify the properties of the test matrix, which is returned in the array AP.
Parameters
IMAT
IMAT is INTEGER An integer key describing which matrix to generate for this path.
UPLO
UPLO is CHARACTER*1 Specifies whether the matrix A will be upper or lower triangular. = 'U': Upper triangular = 'L': Lower triangular
TRANS
TRANS is CHARACTER*1 Specifies whether the matrix or its transpose will be used. = 'N': No transpose = 'T': Transpose = 'C': Conjugate transpose (= Transpose)
DIAG
DIAG is CHARACTER*1 Specifies whether or not the matrix A is unit triangular. = 'N': Non-unit triangular = 'U': Unit triangular
ISEED
ISEED is INTEGER array, dimension (4) The seed vector for the random number generator (used in SLATMS). Modified on exit.
N
N is INTEGER The order of the matrix to be generated.
A
A is REAL array, dimension (N*(N+1)/2) The upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array AP as follows: if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=n.
B
B is REAL array, dimension (N) The right hand side vector, if IMAT > 10.
WORK
WORK is REAL array, dimension (3*N)
INFO
INFO is INTEGER = 0: successful exit < 0: if INFO = -k, the k-th argument had an illegal value
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 123 of file slattp.f.
Author
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