changes

2022-03-07 13:26:25 -05:00
parent d48b94c1d2
commit 8524d5f57e
4 changed files with 28 additions and 46 deletions
--- a/src/parsing.rs
+++ b/src/parsing.rs
@@ -26,9 +26,15 @@ impl BackingFunction {
            return self.get(x);
        }

-        let (x1, x2) = (x - EPSILON, x + EPSILON);
-        let (y1, y2) = (self.derivative(x1, n - 1), (self.derivative(x2, n - 1)));
-        (y2 - y1) / DOUBLE_EPSILON
+        let (y1, y2) = (
+            self.derivative(x - EPSILON, n - 1),
+            (self.derivative(x + EPSILON, n - 1)),
+        );
+
+        match y1 == y2 {
+            true => 0.0,
+            false => (y2 - y1) / DOUBLE_EPSILON,
+        }
    }
 }