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

262 HP MLIB User’s Guide
SSPR2/DSPR2/CHPR2/ZHPR2 Rank-2 update
’L’ or ’l’ The lower triangle of A is stored in the
packed array.
’U’ or ’u’ The upper triangle of A is stored in
the packed array.
n Number of rows and columns in matrix A and elements
of vectors x and y, n ≥ 0. If n = 0, the subprograms do
not reference ap, x, or y.
alpha The scalar α. If alpha = 0, the subprograms do not
reference ap, x, or y.
x Array of length lenx = (n−1)×|incx|+1 containing the
n-vector x.