lib/pvi.c


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// Pvi
//
// pvi
//
// Positive Volume Index
//
// 
//
// Inputs:    5
// Outputs:   1
// Constants: 0


#include "ts.h"


ts_parameter_t const ts_pvi_p = { .n_inputs = 5, .n_outputs = 1, .n_constants = 0, .params_size = 0 };

uint_t ts_pvi_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_pvi(
	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_pvi_p );
	(void)c;
    fp_t pvi = 1000;

    if (n == 0) return -1;

    y[0][0] = pvi;

    if( n > 1 )
    {
        if( x[4][1] > x[4][0] && x[3][0] != 0 )
        {
            fp_t r = ( x[3][1] - x[3][0] ) / x[3][0];
            pvi = pvi * ( 1 + r );
        }
        y[0][1] = pvi;
    }

    for( uint_t i = 2; i < n; ++i )
    {
        if( x[4][i] > x[4][i - 1] && x[3][i - 1] != 0 )
        {
            fp_t r = ( x[3][i] - x[3][i - 1] ) / x[3][i - 1];
            pvi = pvi * ( 1 + r );
        }
        y[0][i] = pvi;
    }

	return 0;
}