public override int Start(string verb, string[] arguments)
{
if (arguments.Length != 1)
{
throw new ArgumentException("Invalid arguments, expecting only one argument.");
}
Expression expression = Expression.Parse(arguments[0]);
// We set parameters.
Expression.FunctionParams p = expression.GetParams(false);
// We apply some defined.
p["PI"] = MathHelper.PI;
p["pi"] = MathHelper.PI;
p["E"] = MathHelper.E;
p["e"] = MathHelper.E;
foreach (KeyValuePair <string, double> element in parameters)
{
p[element.Key] = element.Value;
}
// We evaluate function.
console.Out.WriteLine(expression.Evald(p, functionsSet,
typeof(EvalApp).Module).ToString(CultureInfo.InvariantCulture.NumberFormat));
return(0);
}
public void QuadraticTest()
{
Expression exp = Expression.Parse("quadratic", "(3+2)^2*x^2+(7/4)*x+(x/4)");
Expression.FunctionParams p = exp.Params;
Functionf f = exp.GetFunctionf(p, FunctionSet.Default);
Assert.AreEqual(f(1.0f), (25.0f + 7.0f / 4.0f + 0.25f));
}
internal void MultiDimToSingle()
{
Expression exp = Expression.Parse("x^x,x^(x^x+1),x*x");
Expression.FunctionParams p = exp.GetParams(false);
p.SetBinding("x", exp.Variable(0));
Functiond f = exp.GetFunctiond(p, FunctionSet.Default);
Assert.AreEqual(f(2.0f), 4.0f);
}
public void LinearTest()
{
// Prepare; x must be auto bound.
Expression exp = Expression.Parse("linear", "k*x+n");
Expression.FunctionParams p = exp.GetParams(true);
p["k"] = 2.0;
p["n"] = -2.0;
Functionf f = exp.GetFunctionf(p, FunctionSet.Default);
Assert.AreEqual(f(1.0f), 0.0f);
Assert.AreEqual(f(2.0f), 2.0f);
}
public void IdentityTest()
{
// Construct expression.
Expression exp = Expression.Parse("x");
Expression.FunctionParams p = exp.Params;
p.SetBinding("x", exp.Variable(0));
Functionf f = exp.GetFunctionf(p, null);
// Test it.
for (float x = 0.0f; x < 100.0f; x += 1.0f)
{
Assert.AreEqual(f(x), x);
}
}
