DTRMVT - perform the matrix-vector operations x := T' *y, and w := T *z,

- SUBROUTINE DTRMVT(
- UPLO, N, T, LDT, X, INCX, Y, INCY, W, INCW, Z, INCZ )

CHARACTER UPLO INTEGER INCW, INCX, INCY, INCZ, LDT, N DOUBLE PRECISION T( LDT, *
), W( * ), X( * ), Y( * ), Z( * )

DTRMVT performs the matrix-vector operations x := T' *y, and w := T *z, where x
is an n element vector and T is an n by n

upper or lower triangular matrix.

- UPLO - CHARACTER*1.
- On entry, UPLO specifies whether the matrix is an upper or lower
triangular matrix as follows:
UPLO = 'U' or 'u' A is an upper triangular matrix.
UPLO = 'L' or 'l' A is a lower triangular matrix.
Unchanged on exit.

- N - INTEGER.
- On entry, N specifies the order of the matrix A. N must be at least zero.
Unchanged on exit.

- T - DOUBLE PRECISION array of DIMENSION ( LDT, n ).
- Before entry with UPLO = 'U' or 'u', the leading n by n upper triangular
part of the array T must contain the upper triangular matrix and the
strictly lower triangular part of T is not referenced. Before entry with
UPLO = 'L' or 'l', the leading n by n lower triangular part of the array T
must contain the lower triangular matrix and the strictly upper triangular
part of T is not referenced.

- LDT - INTEGER.
- On entry, LDA specifies the first dimension of A as declared in the
calling (sub) program. LDA must be at least max( 1, n ). Unchanged on
exit.

- X - DOUBLE PRECISION array of dimension at least
- ( 1 + ( n - 1 )*abs( INCX ) ). On exit, X = T' * y

- INCX - INTEGER.
- On entry, INCX specifies the increment for the elements of X. INCX must
not be zero. Unchanged on exit.

- Y - DOUBLE PRECISION array of dimension at least
- ( 1 + ( n - 1 )*abs( INCY ) ). Before entry, the incremented array Y must
contain the n element vector y. Unchanged on exit.

- INCY - INTEGER.
- On entry, INCY specifies the increment for the elements of Y. INCY must
not be zero. Unchanged on exit.

- W - DOUBLE PRECISION array of dimension at least
- ( 1 + ( n - 1 )*abs( INCW ) ). On exit, W = T * z

- INCW - INTEGER.
- On entry, INCW specifies the increment for the elements of W. INCW must
not be zero. Unchanged on exit.

- Z - DOUBLE PRECISION array of dimension at least
- ( 1 + ( n - 1 )*abs( INCZ ) ). Before entry, the incremented array Z must
contain the n element vector z. Unchanged on exit.

- INCY - INTEGER.
- On entrz, INCY specifies the increment for the elements of Y. INCY must
not be zero. Unchanged on exit.
Level 2 Blas routine.
Test the input parameters.
Quick return if possible.
End of DTRMVT.