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sum.cc
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sum.cc
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/*
* This file is part of tindicators, licensed under GNU LGPL v3.
* Author: Ilya Pikulin <ilya.pikulin@gmail.com>, 2019, 2021
* Author: Lewis Van Winkle <lv@codeplea.com>, 2016-2018
*/
#include "../indicators.h"
int ti_sum_start(TI_REAL const *options) {
return (int)options[0]-1;
}
int ti_sum(int size, TI_REAL const *const *inputs, TI_REAL const *options, TI_REAL *const *outputs) {
const TI_REAL *input = inputs[0];
const int period = (int)options[0];
TI_REAL *output = outputs[0];
if (period < 1) return TI_INVALID_OPTION;
if (size <= ti_sum_start(options)) return TI_OKAY;
TI_REAL sum = 0;
int i;
for (i = 0; i < period; ++i) {
sum += input[i];
}
*output++ = sum;
for (i = period; i < size; ++i) {
sum += input[i];
sum -= input[i-period];
*output++ = sum;
}
assert(output - outputs[0] == size - ti_sum_start(options));
return TI_OKAY;
}