lib/fibonacci.c


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// Fibonacci Number
//
// fibonacci - F(n)
//
// F(0)=0, F(1)=1, F(n)=F(n-1)+F(n-2)
//
// Inputs:    1 (n)
// Outputs:   1 (F(n))
// Constants: 0

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


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

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

int ts_fibonacci(
	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_fibonacci_p );
	(void)c;
    for (uint_t i = 0; i < n; ++i)
    {
        if (x[0][i] < 0) { y[0][i] = 0; continue; }
        uint_t k = (uint_t)floor(x[0][i]);
        if (k == 0) { y[0][i] = 0; continue; }
        if (k == 1) { y[0][i] = 1; continue; }
        fp_t a = 0, b = 1, cv = 0;
        for (uint_t j = 2; j <= k; ++j)
        {
            cv = a + b;
            a = b;
            b = cv;
        }
        y[0][i] = cv;
    }
	return 0;
}