Merge commit '42b2e5ca519766e37ce6941ba4faecc9691cc403' into upstream

[debian/openrocket] / core / src / de / congrace / exp4j / Example.java

diff --git a/core/src/de/congrace/exp4j/Example.java b/core/src/de/congrace/exp4j/Example.java
new file mode 100644 (file)
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+++ b/core/src/de/congrace/exp4j/Example.java
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+package de.congrace.exp4j;
+
+import java.util.List;
+
+public class Example {
+
+       public static void main(String[] args) throws UnknownFunctionException, UnparsableExpressionException, InvalidCustomFunctionException {
+
+               // Test 1
+               // ======
+               
+               Calculable calc1 = new ExpressionBuilder("x * y - 2").withVariableNames("x", "y").build();
+               calc1.setVariable(new Variable("x", 1.2));
+               calc1.setVariable(new Variable("y", 2.2));
+               
+               System.out.println(calc1.calculate().toString());
+               //double result = calc1.calculate().getDoubleValue();
+               //System.out.println(result);
+                       
+               // Test 2
+               // ======
+               
+               // A function which calculates the mean of an array and scales it
+               CustomFunction meanFn = new CustomFunction("mean",2) {
+                   public Variable applyFunction(List<Variable> vars) {
+                       
+                       double[] vals;
+                       double scale;
+                       
+                       try{
+                               vals = vars.get(0).getArrayValue();
+                               scale = vars.get(1).getDoubleValue();
+                       } catch (Exception e) {
+                               return new Variable("Invalid");
+                       }
+                       
+                       double subtotal = 0;
+                       for (int i = 0; i < vals.length; i++ ){
+                               subtotal += vals[i];
+                       }
+                       
+                       subtotal = scale * subtotal / vals.length;
+                       return new Variable("double MEAN result, ", subtotal);
+                       
+                   }
+               };
+                               
+               ExpressionBuilder b = new ExpressionBuilder("mean(x,y)");
+               b.withCustomFunction(meanFn);
+               b.withVariable(new Variable("x", new double[] {1.1,2,10,3,2.4,10.2}));
+               b.withVariable(new Variable("y", 2));
+               Calculable calc2 = b.build();
+               
+               System.out.println( calc2.calculate().toString() );
+               
+               // Test 3
+               // ======
+               
+               Calculable calc3 = new ExpressionBuilder("x * y - 2").withVariableNames("x", "y").build();
+               calc3.setVariable(new Variable("x", new double[]{1.2, 10, 20, 15}));
+               calc3.setVariable(new Variable("y", new double[]{2.2, 5.2, 12, 9 }));
+               
+               //double result3 = calc3.calculate().getDoubleValue();
+               System.out.println(calc3.calculate().toString());
+               
+
+               // Test 4
+               // ======
+                               
+               Calculable calc4 = new ExpressionBuilder("log10(sqrt(x) * abs(y))").withVariableNames("x", "y").build();
+               calc4.setVariable(new Variable("x", new double[]{1.2, 10, 10, 15}));
+               calc4.setVariable(new Variable("y", new double[]{2.2, -5.2, 5.2, 9 }));
+               
+               //double result3 = calc3.calculate().getDoubleValue();
+               System.out.println(calc4.calculate().toString());               
+       }
+}