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// Poisson Pdf
//
// poisson_pdf
//
// Poisson probability density
//
//
//
// Inputs: 1
// Outputs: 1
// Constants: 1
#include <math.h>
#include "ts.h"
typedef struct {
fp_t lambda;
} ts_poisson_pdf_params_t;
ts_parameter_t const ts_poisson_pdf_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_poisson_pdf_params_t) };
uint_t ts_poisson_pdf_offset( ts_constant_t const *c )
{
( void )c;
return ( 0 );
}
int ts_poisson_pdf(
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_poisson_pdf_p );
if ( !c ) return -1;
fp_t lambda = ((ts_poisson_pdf_params_t *)c)->lambda;
if (lambda < 0.0 || isnan(lambda) || isinf(lambda)) return -1;
for( uint_t i = 0; i < n; ++i )
{
fp_t k_val = x[0][i];
if( k_val < 0 ) { y[0][i] = 0; continue; }
uint_t k = (uint_t)k_val;
y[0][i] = pow( lambda, k ) * exp( -lambda ) / tgamma( k + 1.0 );
}
return 0;
}
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