vz_log_(3MVEC) Vector Math Library Functions vz_log_(3MVEC)NAME
vz_log_, vc_log_ - vector complex logarithm functions
SYNOPSIS
cc [ flag... ] file... -lmvec [ library... ]
void vz_log_(int *n, double complex * restrict z,
int *stridez, double _complex * restrict w, int *stridew);
void vc_log_(int *n, float complex * restrict z,
int *stridez, float complex * restrict w, int *stridew);
DESCRIPTION
These functions evaluate the complex function log(z) for an entire vec‐
tor of values at once. The first parameter specifies the number of val‐
ues 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.
Specifically, vz_log_(n, z, sz, w, sw) computes w[i * *sw] = log(z[i *
*sz]) for each i = 0, 1, ..., *n - 1. The vc_log_() function performs
the same computation for single precision data.
These functions are not guaranteed to deliver results that are identi‐
cal to the results of the clog(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 clog(3M) functions, the vector complex exponential func‐
tions make no attempt to handle special cases and exceptions; they sim‐
ply use textbook formulas to compute a complex exponential in terms of
real elementary functions. As a result, these functions can raise dif‐
ferent exceptions and/or deliver different results from clog().
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOclog(3M), attributes(5)SunOS 5.10 14 Dec 2007 vz_log_(3MVEC)
