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Fix rounding in FFT (fixes #2961) (#2962)

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leren1
2022-03-05 18:16:34 +01:00
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parent 8bf74929e3
commit fe61eb2bdf
1 changed files with 4 additions and 2 deletions
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6
src/main/java/com/thealgorithms/maths/FFT.java
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@ -142,8 +142,10 @@ public class FFT {
*/ */
public Complex divide(Complex z) { public Complex divide(Complex z) {
Complex temp = new Complex(); Complex temp = new Complex();
temp.real = (this.real * z.real + this.img * z.img) / (z.abs() * z.abs()); double d = z.abs() * z.abs();
temp.img = (this.img * z.real - this.real * z.img) / (z.abs() * z.abs()); d = (double)Math.round(d * 1000000000d) / 1000000000d;
temp.real = (this.real * z.real + this.img * z.img) / (d);
temp.img = (this.img * z.real - this.real * z.img) / (d);
return temp; return temp;
} }