Category talk:Wren-math: Difference between revisions

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@@ Line 14: / Line 14: @@
     // Hyperbolic trig functions.
-    static sinh(x) { (exp(x) - exp(-x))/2 } // sine
+    static sinh(x) { (x.exp - (-x).exp)/2 } // sine
-    static cosh(x) { (exp(x) + exp(-x))/2 } // cosine
+    static cosh(x) { (x.exp + (-x).exp)/2 } // cosine
     static tanh(x) { sinh(x)/cosh(x)      } // tangent
@@ Line 82: / Line 82: @@
         var sum = p[0]
         for (i in 0..7) sum = sum + p[i+1]/(x + i)
-        return 2.sqrt * Num.pi.sqrt * t.pow(x-0.5) * Math.exp(-t) * sum
+        return 2.sqrt * Num.pi.sqrt * t.pow(x-0.5) * (-t).exp * sum
     }
+    // Static alternatives to instance methods in Num class.
+    // Clearer when both arguments are complex expressions.
+    static min(x, y)  { (x < y) ? x : y }
+    static max(x, y)  { (x > y) ? x : y }
+    static atan(x, y) { x.atan(y) }
 }