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// Exponential Decay
//
// decay_exponential - edecay
//
// DESCRIPTION
//
// Inputs: 1
// Outputs: 1
// Constants: 0
#include <math.h>
#include "ts.h"
typedef struct {
uint_t k;
} ts_decay_exponential_params_t;
ts_parameter_t const ts_decay_exponential_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 1, .params_size = sizeof(ts_decay_exponential_params_t) };
uint_t ts_decay_exponential_offset( ts_constant_t const *c )
{
( void )c;
return ( c ? ((ts_decay_exponential_params_t const *)c)->k : 0 );
}
int ts_decay_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_decay_exponential_p );
if ( !c ) return -1;
uint_t k = ((ts_decay_exponential_params_t const *)c)->k;
if (k == 0) return -1;
if (n <= k) return -1;
fp_t a = ( fp_t ) 1.0 - _ts_reciprocal( k );
for( uint_t i = 0; i < k; ++i )
y[0][i] = 0;
fp_t prev = x[0][0];
for( uint_t i = 1; i <= k; ++i )
prev = fmax( x[0][i], prev * a );
y[0][k] = prev;
for( uint_t i = k + 1; i < n; ++i )
{
y[0][i] = fmax( x[0][i], y[0][i - 1] * a );
}
return 0;
}
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