From 71a3adf0cf65b3056c6fddb01b94036e6d1962e0 Mon Sep 17 00:00:00 2001
From: alimf17 <alimf@umich.edu>
Date: Sun, 9 Jun 2024 12:31:48 -0400
Subject: [PATCH] feat: Added in the std_dev method from the Distribution trait
 explicitly

It simply wastes computation to square and then square root a value which is simply inherently part of the distribution definition.
---
 src/distribution/normal.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/distribution/normal.rs b/src/distribution/normal.rs
index 8e7b1e1a..48436955 100644
--- a/src/distribution/normal.rs
+++ b/src/distribution/normal.rs
@@ -193,6 +193,13 @@ impl Distribution<f64> for Normal {
         Some(self.std_dev * self.std_dev)
     }
 
+    /// Returns the standard deviation of the normal distribution
+    /// # Remarks
+    /// This is the same standard deviation used to construct the distribution
+    fn std_dev(&self) -> Option<f64> {
+        Some(self.std_dev)
+    }
+
     /// Returns the entropy of the normal distribution
     ///
     /// # Formula