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

Chapter 3 Basic Matrix Operations 399
Triangular banded matrix-vector multiply F_STBMV/F_DTBMV/F_CTBMV/F_ZTBMV
N Number of rows and columns in matrix A, and
elements of vector X. n > 0. If , the subprograms
do not reference A or X.
K The number of non zero diagonals above or below the
principal diagonal.
ALPHA The scalar ALPHA.
A REAL or COMPLEX array, dimension (LDA, N).
LDA Leading dimension of array A. If lda < k + 1, an error
condition is generated.
X REAL or COMPLEX array, minimum length
(N - 1) x |incx| + 1.
INCX Increment for the array x. A vector x having component
x
i
, i = 1,..., n, is stored in an array X() with increment
argument incx. If incx > 0 then x
i
is stored in
X (1 + (i - 1) x incx). If incx < 0 then x
i
is stored in
X (1 + (N - i) x |incx|). incx = 0 is an illegal value.
Output X The updated X vector replaces the input.
n 0≤