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dx.cc
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dx.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>, 2016-2017, 2019
*/
#include <new>
#include "../indicators.h"
#include "dx.h"
int ti_dx_start(TI_REAL const *options) {
return (int)options[0]-1;
}
int ti_dx(int size, TI_REAL const *const *inputs, TI_REAL const *options, TI_REAL *const *outputs) {
const TI_REAL *high = inputs[0];
const TI_REAL *low = inputs[1];
const int period = (int)options[0];
TI_REAL *output = outputs[0];
if (period < 1) return TI_INVALID_OPTION;
if (size <= ti_dx_start(options)) return TI_OKAY;
const TI_REAL per = ((TI_REAL)period-1) / ((TI_REAL)period);
TI_REAL dmup = 0;
TI_REAL dmdown = 0;
int i;
for (i = 1; i < period; ++i) {
TI_REAL dp, dm;
CALC_DIRECTION(dp, dm);
dmup += dp;
dmdown += dm;
}
{
TI_REAL di_up = dmup;
TI_REAL di_down = dmdown;
TI_REAL dm_diff = fabs(di_up - di_down);
TI_REAL dm_sum = di_up + di_down;
TI_REAL dx = dm_diff / dm_sum * 100;
if (dm_sum == 0) { dx = 0; }
*output++ = dx;
}
for (i = period; i < size; ++i) {
TI_REAL dp, dm;
CALC_DIRECTION(dp, dm);
dmup = dmup * per + dp;
dmdown = dmdown * per + dm;
TI_REAL di_up = dmup;
TI_REAL di_down = dmdown;
TI_REAL dm_diff = fabs(di_up - di_down);
TI_REAL dm_sum = di_up + di_down;
TI_REAL dx = dm_diff / dm_sum * 100;
if (dm_sum == 0) { dx = 0; }
*output++ = dx;
}
assert(output - outputs[0] == size - ti_dx_start(options));
return TI_OKAY;
}