lib/sign.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

// Sign
//
// sign - sgn
//
//          ⎧ -1 if x < 0
// f( x ) = ⎨  0 if x = 0
//          ⎩  1 if x > 0
//
// X_n - 1
// Y_n - 1
// C_n - 0


#include "ts.h"


ts_parameter_t const ts_sign_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };


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

int ts_sign(
	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_sign_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		y[0][i] = ( x[0][i] > 0 ) - ( x[0][i] < 0 );
	}
	return 0;
}