Use f64 instead.

src/gaussian.rs

@@ -2,8 +2,8 @@ use std::ops;
 
 #[derive(Clone, Copy)]
 pub struct Gaussian {
-    pub pi: f32,
-    pub tau: f32,
+    pub pi: f64,
+    pub tau: f64,
 }
 
 impl Gaussian {
@@ -11,17 +11,17 @@ impl Gaussian {
         Gaussian::with_pi_tau(0.0, 0.0)
     }
 
-    pub fn with_pi_tau(pi: f32, tau: f32) -> Gaussian {
+    pub fn with_pi_tau(pi: f64, tau: f64) -> Gaussian {
         Gaussian { pi, tau }
     }
 
-    pub fn with_mu_sigma(mu: f32, sigma: f32) -> Gaussian {
+    pub fn with_mu_sigma(mu: f64, sigma: f64) -> Gaussian {
         let pi = 1.0 / sigma.powi(2);
 
         Gaussian::with_pi_tau(pi, pi * mu)
     }
 
-    pub fn mu(&self) -> f32 {
+    pub fn mu(&self) -> f64 {
         if self.pi == 0.0 {
             0.0
         } else {
@@ -29,7 +29,7 @@ impl Gaussian {
         }
     }
 
-    pub fn sigma(&self) -> f32 {
+    pub fn sigma(&self) -> f64 {
         (1.0 / self.pi).sqrt()
     }
 }