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I'm trying to pass an array of complex numbers (I've created a class called Complex that just stores a real and imaginay part) into my dft function below and get it to spit out some results. I've tried numerous variations of x -including x[], x[3], **x* to try to pass the array of data into the dft function, but I keep getting "undefined reference to 'Complex::dft(Complex*, int, int)".

I apologise in advance if I've just done something really stupid and obvious, but I've been staring at this for hours and keep drawing a blank. Any help would be greatly appreciated.

Thanks


This is my dft function:

 #include <iostream>
 #include "Complex.h"
 #include "ofstream_add.h"
 #include <cmath>
 const double PI=4*atan(1.0);
 
 Complex dft(Complex x[], int N, int n)
 {
 Complex holder;
 Complex sum = Complex(0,0);
 Complex temp;
 
 for (int k=0; k<N; k++)
 {
 temp = Complex(cos(2.0*PI*k*n/N),-sin(2.0*PI*k*n/N));
 sum = sum + x[k] * temp;
 }
 double conv = N; //convert integer to double as complex takes in doubles
 Complex complexN((1/conv),(1/conv));
 holder = complexN * sum;
 
 return holder;
 }

This is my main programme:

 #include <iostream>
 #include <iomanip>
 #include "Complex.h"
 #include "ofstream_add.h"

 int main()
 {
 int N = 3;
 Complex holder;
 Complex y[N];
 double re,im,ansRe,ansIm;
 
 Complex a(2,1.7);
 Complex b(3.5,1.2);
 Complex c(4.2,2.3);
 Complex x[3] = {a, b, c};

 for (int n=0;n<N;n++)
 {
 //does some processing on the array of complex numbers an spits out a 
 //real and imaginary part
 double ansRe = holder.dft(x,N,n).getReal();
 double ansIm = holder.dft(x,N,n).getImag();
 
 //stores the result in a new complex number
 y[n].setReal(ansRe);
 y[n].setImag(ansIm);
 }
 }

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