| /** |
| * This file has no copyright assigned and is placed in the Public Domain. |
| * This file is part of the w64 mingw-runtime package. |
| * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| */ |
| /* cpowf.c */ |
| /* |
| Contributed by Danny Smith |
| 2004-12-24 |
| */ |
| |
| /* cpow(X, Y) = cexp(X * clog(Y)) */ |
| |
| #include <math.h> |
| #include <complex.h> |
| |
| float complex cpowf (float complex X, float complex Y) |
| { |
| float complex Res; |
| float i; |
| float r = _hypot (__real__ X, __imag__ X); |
| if (r == 0.0f) |
| { |
| __real__ Res = __imag__ Res = 0.0; |
| } |
| else |
| { |
| float rho; |
| float theta; |
| i = cargf (X); |
| theta = i * __real__ Y; |
| |
| if (__imag__ Y == 0.0f) |
| /* This gives slightly more accurate results in these cases. */ |
| rho = powf (r, __real__ Y); |
| else |
| { |
| r = logf (r); |
| /* rearrangement of cexp(X * clog(Y)) */ |
| theta += r * __imag__ Y; |
| rho = expf (r * __real__ Y - i * __imag__ Y); |
| } |
| |
| __real__ Res = rho * cosf (theta); |
| __imag__ Res = rho * sinf (theta); |
| } |
| return Res; |
| } |