getNormal() from Mark Johnson.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2913 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/main/java/com/samskivert/util/Randoms.java

@@ -126,13 +126,22 @@ public class Randoms
     }
 
     /**
-     * Returns <code>true</code> or <code>false</code> with approximately even probability. 
+     * Returns <code>true</code> or <code>false</code> with approximately even probability.
      */
     public boolean getBoolean ()
     {
         return _r.nextBoolean();
     }
 
+    /**
+     * Returns a pseudorandom, normally distributed <code>float</code> value around the
+     * <code>mean</code> with the standard deviation <code>dev</code>.
+     */
+    public float getNormal (float mean, float dev)
+    {
+        return (float)_r.nextGaussian() * dev + mean;
+    }
+
     /**
      * Returns a key from the supplied map according to a probability computed as
      * the key's value divided by the total of all the key's values.