NAME
logf4
- return base-e (natural) logarithms of float elements
SYNOPSIS
Procedure
call syntax:
| #include <simdmath.h> |
| vector float logf4(vector float x); |
| Link with -lsimdmath |
Inline call syntax:
| #include <simdmath.h> |
| #include <logf4.h> |
| vector float _logf4(vector float x); |
| Parameters |
|
| x |
input vector |
DESCRIPTION
The logf4 function
returns the natural logarithms for each x.
RETURN VALUE
The function
logf4 returns
a float vector in which each element is defined as:
- the natural logarithm for the corresponding element of x if the
element is not 0, or
- -HUGE_VALF if the value of the corresponding element of x is 0.
- If an element of x is negative, the corresponding element of the
result is undefined.
CONFORMING TO
SIMD Math library
specification for the Cell Broadband Engine™ Architecture.
NOTES
Basis
ISO9899
(C99) log functions.
SEE ALSO
log(3),
logd2(3), exp(3),
expf4(3),
expd2(3), exp2(3),
exp2f4(3),
exp2d2(3), expm1(3),
expm1f4(3),
expm1d2(3), frexp(3),
frexpf4(3),
frexpd2(3), ldexp(3),
ldexpf4(3),
ldexpd2(3), pow(3),
powf4(3),
powd2(3), hypot(3),
hypotd2(3),
hypotf4(3), sqrt(3),
sqrtf4(3),
sqrtd2(3),
cbrt(3),
cbrtf4(3),
cbrtd2(3), log10(3),
log2f4(3),
log2d2(3), log1p(3),
log10f4(3),
log10d2(3), logb(3),
log1pf4(3),
log1pd2(3), ilogb(3),
logbf4(3),
scalbn(3),
ilogbf4(3),
ilogbd2(3)