VZ_POW_(3MVEC) Vector Math Library Functions VZ_POW_(3MVEC)
NAME
vz_pow_, vc_pow_ - vector complex power functions
SYNOPSIS
cc [
flag... ]
file...
-lmvec [
library... ]
void vz_pow_(
int *n,
double complex * restrict z,
int *stridez,
double complex * restrict w,
int *stridew,
double complex * restrict u,
int *strideu,
double * tmp);
void vc_pow_(
int *n,
float complex * restrict z,
int *stridez,
float complex * restrict w,
int *stridew,
float complex * restrict u,
int *strideu,
float * tmp);
DESCRIPTION
These functions evaluate the complex function
z^
w for an entire
vector of values at once. The first parameter specifies the number of
values to compute. Subsequent parameters specify the argument and
result vectors. Each vector is described by a pointer to the first
element and a stride, which is the increment between successive
elements. The last argument is a pointer to scratch storage; this
storage must be large enough to hold 3 * *
n consecutive values of the
real type corresponding to the complex type of the argument and
result.
Specifically,
vz_pow_(
n,
z,
sz,
w,
sw,
u,
su,
tmp) computes
u[
i *
*
su] = (
z[
i * *
sz])^(
w[
i * *
sw]) for each
i = 0, 1, ..., *
n - 1. The
vc_pow_() function performs the same computation for single precision
data.
These functions are not guaranteed to deliver results that are
identical to the results of the
cpow(3M) functions given the same
arguments.
USAGE
The element count *
n must be greater than zero. The strides for the
argument and result arrays can be arbitrary integers, but the arrays
themselves must not be the same or overlap. A zero stride effectively
collapses an entire vector into a single element. A negative stride
causes a vector to be accessed in descending memory order, but note
that the corresponding pointer must still point to the first element
of the vector to be used; if the stride is negative, this will be the
highest-addressed element in memory. This convention differs from the
Level 1 BLAS, in which array parameters always refer to the lowest-
addressed element in memory even when negative increments are used.
These functions assume that the default round-to-nearest rounding
direction mode is in effect. On x86, these functions also assume that
the default round-to-64-bit rounding precision mode is in effect. The
result of calling a vector function with a non-default rounding mode
in effect is undefined.
Unlike the c99
cpow(3M) functions, the vector complex exponential
functions make no attempt to handle special cases and exceptions;
they simply use textbook formulas to compute a complex exponential in
terms of real elementary functions. As a result, these functions can
raise different exceptions and/or deliver different results from
cpow().
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Committed |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
SEE ALSO
cpow(3M),
attributes(7)SunOS 5.11 December 14, 2007 VZ_POW_(3MVEC)
