cexp(), cexpf(), cexpl()
QNX SDP8.0C Library ReferenceAPIDeveloper
Compute the complex base-e exponential of a complex number
Synopsis:
#include <complex.h>
double complex cexp(double complex z );
float complex cexpf(float complex z );
long double complex cexpl(long double complex z );
Arguments:
- z
- The complex value that you want to compute the complex base-e exponential of.
Library:
- libm
- The general-purpose math library.
- libm-sve
- A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.
Your system requirements will determine how you should work with these libraries:
- If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
- If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.
Note:
Compile your program with the -fno-builtin option to prevent the compiler from using a
built-in version of the function.
Description:
These functions compute the complex base-e exponential of z. If z = x+iy, the complex exponential is:
ez = ex cis(y)
= ex (cos(y) + i sin(y))
The exponential function is an entire function in the complex plane and has no branch cuts.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
- Call
feclearexcept(FE_ALL_EXCEPT)before calling cexp(), cexpf(), or cexpl(). - On return, if
fetestexcept(FE_ALL_EXCEPT)is nonzero, then an error has occurred.
Returns:
If no errors occur, the complex base-e exponential of z.
| If z is: | These functions return: | Errors: |
|---|---|---|
| ±0 + 0i | 1 + 0i | — |
| x + Infi, for any finite x | NaN + NaNi | FE_INVALID |
| x + NaNi, for any finite x | NaN + NaNi | — |
| Inf + 0i | Inf + 0i | — |
| -Inf + yi, for any finite y | 0 * cis(y) | — |
| Inf + yi, for any finite nonzero y | Inf * cis(y) | — |
| -Inf + Infi | ±0 ± 0i, where the signs are unspecified | — |
| Inf + Infi | ±Inf + NaNi, where the sign of the real part is unspecified | FE_INVALID |
| -Inf + NaNi | ±0 ± 0i, where the signs are unspecified | — |
| Inf + NaNi | ±Inf - NaNi, where the sign of the real part is unspecified | — |
| NaN + 0i | NaN + 0i | — |
| NaN + yi, for any nonzero y | NaN + NaNi | — |
| NaN + NaNi | NaN + NaNi | — |
where cis(y) is cos(y) + i sin(y).
These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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