feat: calc scale factor once

rust-dd · Aug 29, 2024 · 4baea29 · 4baea29
1 parent c085995
commit 4baea29
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/noises/fgn.rs b/src/noises/fgn.rs
@@ -109,9 +109,10 @@ impl Generator for FgnFft {
     let fft_handler = self.fft_handler.clone();
     let mut fgn_fft = self.fft_fgn.clone();
     ndfft_par(&fgn, &mut fgn_fft, &fft_handler, 0);
+    let scale_factor = self.t.powf(self.hurst) * (self.n as f64).powf(-self.hurst);
     let fgn = fgn_fft
       .slice(s![1..self.n - self.offset + 1])
-      .mapv(|x: Complex<f64>| (x.re * (self.n as f64).powf(-self.hurst)) * self.t.powf(self.hurst));
+      .mapv(|x: Complex<f64>| x.re * scale_factor);
     fgn
   }