HP MLIB User's Guide Vol. 1 7th Ed.

Chapter 3 Basic Matrix Operations 413
Multiple triangular matrix-vector multiply F_STRMVT/F_DTRMVT/F_CTRMVT/F_ZTRMVT
Output X REAL or COMPLEX array, minimum length
(N - 1) x |incx| + 1. Stores the result of the transpose
matrix-vector multiply.
W REAL or COMPLEX array, minimum length
(N - 1) x |incw| + 1. Stores the result of the
matrix-vector multiply.