From d3e78ce6e9e85f374e80137993f6210a0c6dd4a2 Mon Sep 17 00:00:00 2001
From: skylarmt <apocalypselabs@gmail.com>
Date: Fri, 30 Jan 2015 12:47:28 -0700
Subject: [PATCH] Add vpa(expr) to turn input into a number.

---
 src/net/apocalypselabs/symat/Functions.java | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/net/apocalypselabs/symat/Functions.java b/src/net/apocalypselabs/symat/Functions.java
index 383620c..37a8a24 100644
--- a/src/net/apocalypselabs/symat/Functions.java
+++ b/src/net/apocalypselabs/symat/Functions.java
@@ -49,6 +49,7 @@ import static java.lang.Math.*;
 import java.util.HashMap;
 import javax.swing.JOptionPane;
 import org.matheclipse.core.eval.EvalUtilities;
+import org.matheclipse.core.interfaces.IExpr;
 import org.matheclipse.parser.client.math.MathException;
 
 /**
@@ -109,6 +110,14 @@ public class Functions {
     public String simplify(String expr) {
         return sym("Simplify("+expr+")");
     }
+    
+    public Object vpa(String expr) {
+        IExpr ans = util.evaluate("N("+expr+")");
+        if (ans.isNumber()) {
+            return Double.parseDouble(ans.toString());
+        }
+        return ans.toString();
+    }
 
     public double rad(double degrees) {
         return degrees * (PI / 180);
@@ -122,7 +131,7 @@ public class Functions {
         return util.evaluate(input).toString();
     }
 
-    // Shortcut for non-JS math evaluation.
+    // Shortcut for symja evaluation.
     public String $(String input) {
         return sym(input);
     }