Revision 14, 1.4 KB
(checked in by jgaeddert, 16 years ago)
|
adding utility functions, basic concept; not yet functional
|
Rev | Line | |
---|
[14] | 1 | // |
---|
| 2 | // Utility |
---|
| 3 | // |
---|
| 4 | |
---|
| 5 | #include <math.h> |
---|
| 6 | #include <stdlib.h> |
---|
| 7 | #include "utility.h" |
---|
| 8 | |
---|
| 9 | typedef float(*utility_function_prototype)(float _x, float _eta, float _sig); |
---|
| 10 | float util_func_atan(float _x, float _eta, float _sig); |
---|
| 11 | float util_func_gauss(float _x, float _eta, float _sig); |
---|
| 12 | |
---|
| 13 | struct utility_s { |
---|
| 14 | float target; |
---|
| 15 | int shape; |
---|
| 16 | int scale; |
---|
| 17 | int minmax; |
---|
| 18 | utility_function_prototype f; |
---|
| 19 | float eta; |
---|
| 20 | float sig; |
---|
| 21 | }; |
---|
| 22 | |
---|
| 23 | utility utility_create(float _target, int _shape, int _scale, int _minmax) |
---|
| 24 | { |
---|
| 25 | utility u = (utility) malloc(sizeof(struct utility_s)); |
---|
| 26 | u->target = _target; |
---|
| 27 | u->shape = _shape; |
---|
| 28 | u->scale = _scale; |
---|
| 29 | u->minmax = _minmax; |
---|
| 30 | |
---|
| 31 | switch (u->shape) { |
---|
| 32 | case UTIL_SHAPE_BELL: |
---|
| 33 | u->f = &util_func_gauss; |
---|
| 34 | u->eta = u->target; |
---|
| 35 | u->sig = 1.0f; |
---|
| 36 | break; |
---|
| 37 | case UTIL_SHAPE_RAMP: |
---|
| 38 | u->f = &util_func_atan; |
---|
| 39 | u->eta = 0.0f; |
---|
| 40 | u->sig = 1.0f; |
---|
| 41 | break; |
---|
| 42 | default:; |
---|
| 43 | } |
---|
| 44 | |
---|
| 45 | return u; |
---|
| 46 | } |
---|
| 47 | |
---|
| 48 | void utility_free(utility _u) |
---|
| 49 | { |
---|
| 50 | free(_u); |
---|
| 51 | } |
---|
| 52 | |
---|
| 53 | float utility_evaluate(utility _u, float _x) |
---|
| 54 | { |
---|
| 55 | float y = _x / _u->target; |
---|
| 56 | if (_u->scale==UTIL_REL_LOG) |
---|
| 57 | y = logf(y); |
---|
| 58 | return _u->f( y, _u->eta, _u->sig); |
---|
| 59 | |
---|
| 60 | } |
---|
| 61 | |
---|
| 62 | float util_func_atan(float _x, float _eta, float _sig) { |
---|
| 63 | return tanhf((_x-_eta)/_sig); |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | float util_func_gauss(float _x, float _eta, float _sig) { |
---|
| 67 | return expf( -powf((_x-_eta),2)/(2*_sig*_sig) ); |
---|
| 68 | } |
---|
| 69 | |
---|