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| #include <windows.h>
#include <xlcall.h>
#include <framewrk.h>
#include <stdio.h>
#include <math.h>
#include<iostream>
//programme ayant pour but d'interpoler en un point x , et avec deux tableaux
__declspec(dllexport) xloper* interp(double x, FP *yy,FP *xx, int dont_extrapolate)
{
if(yy->columns !=xx->columns ||yy->rows !=xx->rows)
return p_xlErrValue;
int low=0,high, i;
static xloper ret_val={0.0,xltypeNum};
if (yy->rows==1)
high=yy->columns-1;
else if (yy->columns==1)
high=yy->rows-1;
else return p_xlErrValue;
if (high==0)
{
ret_val.val.num=yy->array[0];
return &ret_val;
}
if(x<xx->array[0] || x>xx->array[high])
{
if(dont_extrapolate)
return p_xlErrNum;
ret_val.val.num=yy->array[x<xx->array[0] ? 0: high];
return &ret_val;
}
while(high-low>1)
{
i=(high+low)>>1;
if(xx->array[i]>x)
high=i;
else
low=i;
}
ret_val.val.num=yy->array[low]+(x-xx->array[low])*(yy->array[high]-yy->array[low])
/(xx->array[high]-xx->array[low]);
return &ret_val;
} |
