how to find the maximum and minimum value of a function

[pomaton12]

Hello, is there a way to calculate the maximum value and the minimum value of a function declared in string function = "x^2 +2" within a range 0 - 10

[gumbarros]

Merry Christmas🎅🎄

Is this snippet what you need?

using NCalc;

string function = "x^2 + 2";

Expression expression = new(function);


double maxValue = double.MinValue;
double maxArg = 0;
double minValue = double.MaxValue;
double minArg = 0;

for (double x = 0; x <= 10; x++)
{
    expression.Parameters["x"] = x;
    var result = Convert.ToDouble(expression.Evaluate());

    if (result > maxValue)
    {
        maxValue = result;
        maxArg = x;
    }

    if (result < minValue)
    {
        minValue = result;
        minArg = x;
    }
}

Console.WriteLine($"Maximum value: {maxValue} at x = {maxArg}");
Console.WriteLine($"Minimum value: {minValue} at x = {minArg}");

[Bykiev]

You can also use array parameters like this:

ncalc/test/NCalc.Tests/Fixtures.cs

Lines 535 to 544 in 08994e2

	var e = new Expression("x * x", EvaluateOptions.IterateParameters);
	e.Parameters["x"] = new [] { 0, 1, 2, 3, 4 };
	var result = (IList)e.Evaluate();
	Assert.AreEqual(0, result[0]);
	Assert.AreEqual(1, result[1]);
	Assert.AreEqual(4, result[2]);
	Assert.AreEqual(9, result[3]);
	Assert.AreEqual(16, result[4]);

[gumbarros]

@pomaton12 feel free to close the issue if your problem is solved.