public void ExecuteTest1()
{
var functions = new FunctionCollection();
functions.Add(new UserFunction("f", new IExpression[] { new Variable("x") }, 1), new Ln(new Variable("x")));
var func = new UserFunction("f", new IExpression[] { new Number(1) }, 1);
Assert.Equal(Math.Log(1), func.Execute(functions));
}
public void ExecuteTest2()
{
var functions = new FunctionCollection();
var func = new UserFunction("f", new IExpression[] { new Number(1) }, 1);
Assert.Throws<KeyNotFoundException>(() => func.Execute(functions));
}
public void ExecuteTest3()
{
var uf1 = new UserFunction("func", new[] { new Variable("x") }, 1);
var func = new DelegateExpression(p => (double)p.Variables["x"] == 10 ? 0 : 1);
var funcs = new FunctionCollection();
funcs.Add(uf1, func);
var uf2 = new UserFunction("func", new[] { new Number(12) }, 1);
var result = uf2.Execute(new ExpressionParameters(funcs));
Assert.Equal(1, result);
}
public void ExecuteRecursiveTest()
{
var expParams = new ExpressionParameters();
var exp = new If(new Equal(new Variable("x"), new Number(0)),
new Number(1),
new Mul(new Variable("x"), new UserFunction("f", new[] { new Sub(new Variable("x"), new Number(1)) }, 1)));
expParams.Functions.Add(new UserFunction("f", new[] { new Variable("x") }, 1), exp);
var func = new UserFunction("f", new[] { new Number(4) }, 1);
Assert.Equal(24.0, func.Execute(expParams));
}
