lib/exponential.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

// Exponential
//
// exponential - exp
//
// f( x ) = b^x
//
// X_n - 1
// Y_n - 1
// C_n - 1
//
// c[0] = b


#include <math.h>
#include "ts.h"


typedef struct {
    fp_t b;
} ts_exponential_params_t;

ts_parameter_t const ts_exponential_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_exponential_params_t) };


uint_t ts_exponential_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_exponential(
	fp_t * const *y, uint_t y_n,
	fp_t const * const *x, uint_t x_n,
	uint_t n, ts_constant_t const *c
)
{
	TS_PROLOGUE( ts_exponential_p );
	if ( !c ) return -1;
	fp_t b = ((ts_exponential_params_t *)c)->b;
	if (b <= 0) return -1;

	for( uint_t i = 0; i < n; ++i )
	{
		y[0][i] = pow( b, x[0][i] );
	}
	return 0;
}