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

66 HP MLIB User’s Guide
SAXPY/DAXPY/CAXPY/CAXPYC/ZAXPY/ZAXPYC Elementary vector operation
INTEGER*8 n, incx, incy
COMPLEX*8 a, x(lenx), y(leny)
CALL CAXPY(n, a, x, incx, y, incy)
INTEGER*8 n, incx, incy
COMPLEX*8 a, x(lenx), y(leny)
CALL CAXPYC(n, a, x, incx, y, incy)
INTEGER*8 n, incx, incy
COMPLEX*16 a, x(lenx), y(leny)
CALL ZAXPY(n, a, x, incx, y, incy)
INTEGER*8 n, incx, incy
COMPLEX*16 a, x(lenx), y(leny)
CALL ZAXPYC(n, a, x, incx, y, incy)
Input n Number of elements of vectors x and y to be used in the
elementary vector operation. If n ≤ 0, the subprograms
do not reference x or y.
a The scalar a.
x Array of length lenx = (n−1)×|incx|+1 containing the
n-vector x. x is used in conjugated form by CAXPYC
and ZAXPYC and in unconjugated form by the other
subprograms.
incx Increment for the array x:
incx ≥ 0 x is stored forward in array x; that is,
x
i
is stored in x((i−1)×incx+1).
incx < 0 x is stored backward in array x; that
is, x
i
is stored in x((i−n)×incx+1).
Use incx = 1 if the vector x is stored contiguously in
array x; that is, if x
i
is stored in x(i). Refer to “BLAS
Indexing Conventions” in the introduction to this
chapter.
y Array of length leny = (n−1)×|incy|+1 containing the
n-vector y.
incy Increment for the array y, incy ≠ 0:
incy > 0 y is stored forward in array y; that is,
y
i
is stored in y((i−1)×incy+1).
incy < 0 y is stored backward in array y; that
is, y
i
is stored in y((i−n)×incy+1).