Merge pull request #483 from alzatin/equation-x

Equation using same variable more than once fix

src/js/molecules/equation.js

@@ -102,13 +102,15 @@ export default class Equation extends Atom {
             }
 
             if(this.inputs.every(x => x.ready)){
-
-                //Substitute numbers into the string
+            //Substitute numbers into the string
                 var substitutedEquation = this.currentEquation
-                for (var key in this.inputs){
-                    substitutedEquation = substitutedEquation.replace(this.inputs[key].name, this.findIOValue(this.inputs[key].name))
+                for (variable in variables){
+                    for (var i= 0; i<this.inputs.length; i++){
+                        if (this.inputs[i].name == variables[variable]) {
+                            substitutedEquation = substitutedEquation.replace(this.inputs[i].name, this.findIOValue(this.inputs[i].name))
+                        } 
+                    }      
                 }
-
                 //Evaluate the equation
                 this.value = GlobalVariables.limitedEvaluate(substitutedEquation)