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// Alligator Indicator
//
// William Elder's Alligator uses three SMAs shifted forward in time:
// Jaw: SMA(13) shifted 8 bars
// Teeth: SMA(8) shifted 5 bars
// Lips: SMA(5) shifted 3 bars
//
// X_n - 1
// Y_n - 3
// C_n - 0
#include "ts.h"
ts_parameter_t const ts_alligator_p = { .n_inputs = 1, .n_outputs = 3, .n_constants = 0, .params_size = 0 };
uint_t ts_alligator_offset( ts_constant_t const *c )
{
( void )c;
return ( 12 );
}
int ts_alligator(
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_alligator_p );
(void)c;
if( n == 0 ) return -1;
/* Jaw: SMA(13) shifted 8 positions */
/* Teeth: SMA(8) shifted 5 positions */
/* Lips: SMA(5) shifted 3 positions */
/* Jaw: SMA13 of x[i-8..i+4], displayed at i */
for (uint_t i = 8; i - 8 + 13 <= n; ++i)
{
fp_t sum = 0;
for (uint_t j = 0; j < 13; ++j)
{
sum += x[0][i - 8 + j];
}
y[0][i] = sum / 13;
}
/* Teeth: SMA8 of x[i-5..i+2], displayed at i */
for (uint_t i = 5; i - 5 + 8 <= n; ++i)
{
fp_t sum = 0;
for (uint_t j = 0; j < 8; ++j)
{
sum += x[0][i - 5 + j];
}
y[1][i] = sum / 8;
}
/* Lips: SMA5 of x[i-3..i+1], displayed at i */
for (uint_t i = 3; i - 3 + 5 <= n; ++i)
{
fp_t sum = 0;
for (uint_t j = 0; j < 5; ++j)
{
sum += x[0][i - 3 + j];
}
y[2][i] = sum / 5;
}
return 0;
}
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