Code:
//This is a sample program to calculate a DFT Coefficients using the formula
import java.util.Scanner;
public class DFT_Coefficient
{
double real, img;
public DFT_Coefficient()
{
this.real = 0.0;
this.img = 0.0;
}
public static void main(String args[])
{
int N = 10;
Scanner sc = new Scanner(System.in);
System.out.println("Calculation DFT Coefficients");
System.out.println("Enter the coefficient of simple linear funtion:");
System.out.println("ax + by = c");
double a = sc.nextDouble();
double b = sc.nextDouble();
double c = sc.nextDouble();
double []function = new double[N];
for(int i=0; i
{
function[i] = (((a*(double)i) + (b*(double)i)) - c);
//System.out.print( " "+function[i] + " ");
}
System.out.println("Enter the max K value: ");
int k = sc.nextInt();
double []cos = new double[N];
double []sin = new double[N];
for(int i=0; i
{
cos[i] = Math.cos((2 * i * k * Math.PI) / N);
sin[i] = Math.sin((2 * i * k * Math.PI) / N);
}
DFT_Coefficient dft_val = new DFT_Coefficient();
System.out.println("The coefficients are: ");
for(int i=0; i
{
dft_val.real += function[i] * cos[i];
dft_val.img += function[i] * sin[i];
}
System.out.println("("+dft_val.real + ") - " + "("+dft_val.img + " i)");
sc.close();
}
}
Output:
Calculation DFT Coefficients
Enter the coefficient of simple linear funtion:
ax + by = c
1 2 3
Enter the max K value:
2
The coefficients are:
(-15.00000000000001) - (-20.6457288070676 i)
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