gemv_i(3PI) Sun Interval Performance Library gemv_i(3PI)NAMEgemv_i - General interval matrix and vector multiplication.
DESCRIPTION
Y = ALPHA * A * X + BETA * Y
or
Y = ALPHA * A_TRANSPOSED * X + BETA * Y
The routine GEMV_I multiplies the interval vector X by general inter‐
val matrix A or its transpose, scales the resulting interval vector and
adds it to the scaled interval vector operand Y. The routine returns
immediately if N or M is equal to zero.
SYNOPSIS
SUBROUTINE GEMV_I( A, X, Y [, TRANSA] [, ALPHA] [, BETA] )
INTERVAL, INTENT(IN) :: A(:,:), X(:)
INTERVAL, INTENT(INOUT) :: Y(:)
TYPE(blas_trans_type), INTENT(IN), OPTIONAL :: TRANSA
INTERVAL, INTENT(IN), OPTIONAL :: ALPHA, BETA
where
A has shape (M,N),
X has shape N and Y has shape M if TRANSA = blas_no_trans (the default)
X has shape M and Y has shape N if TRANSA /= blas_no_trans
ARGUMENTS
A (input)
Array of DIMENSION (M,N).
Unchanged on exit.
X (input)
Array of DIMENSION N if TRANSA = blas_no_trans
(the default) or
array of DIMENSION M if TRANSA /= blas_no_trans.
Unchanged on exit.
Y (input/output)
On entry,
array of DIMENSION M if TRANSA = blas_no_trans
(the default) or
array of DIMENSION N if TRANSA /= blas_no_trans.
On exit,
if TRANSA = blas_no_trans (the default):
Y = ALPHA * A * X + BETA * Y or
if TRANSA /= blas_no_trans:
Y = ALPHA * A_TRANSPOSED * X + BETA * Y
TRANSA (input)
On entry, TRANSA specifies the matrix A transpose.
Possible values:
TRANSA = blas_no_trans (the default)
TRANSA = blas_trans
Unchanged on exit.
ALPHA (input)
On entry, ALPHA specifies the scalar ALPHA.
Default value is ALPHA = [1,1].
Unchanged on exit.
BETA (input)
On entry, BETA specifies the scalar BETA.
Default value is BETA = [0,0].
Unchanged on exit.
ERRORS
blas_error_alloc
A, X or Y is unallocated array
blas_error_shape
A, X or Y has unappropriate shape
6 Mar 2009 gemv_i(3PI)