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

Chapter 2 Basic Vector Operations 89
Sparse dot product SDOTI/DDOTI/CDOTCI/CDOTUI/ZDOTCI/ZDOTUI
INTEGER*4 m, indx(m)
COMPLEX*16 s, ZDOTUI, x(m), y(n)
s = ZDOTUI(m, x, indx, y)
VECLIB8:
INTEGER*8 m, indx(m)
REAL*4 s, SDOTI, x(m), y(n)
s = SDOTI(m, x, indx, y)
INTEGER*8 m, indx(m)
REAL*8 s, DDOTI, x(m), y(n)
s = DDOTI(m, x, indx, y)
INTEGER*8 m, indx(m)
COMPLEX*8 s, CDOTCI, x(m), y(n)
s = CDOTCI(m, x, indx, y)
INTEGER*8 m, indx(m)
COMPLEX*8 s, CDOTUI, x(m), y(n)
s = CDOTUI(m, x, indx, y)
INTEGER*8 m, indx(m)
COMPLEX*16 s, ZDOTCI, x(m), y(n)
s = ZDOTCI(m, x, indx, y)
INTEGER*8 m, indx(m)
COMPLEX*16 s, ZDOTUI, x(m), y(n)
s = ZDOTUI(m, x, indx, y)
Input m Number of interesting elements of x, m ≤ n. If m ≤ 0,
the subprograms do not reference x, indx, or y.
x Array of length m containing the interesting elements
of x. x is used in conjugated form by CDOTCI and
ZDOTCI and in unconjugated form by the other
subprograms.
indx Array containing the indices {k
i
} of the interesting
elements of x. The indices must satisfy
where n is the length of y.
y Array containing the elements of y,.
1 indx i() n≤≤i 12… m,,, ,=,
y i() y
i
=