Convergence error for simple cases.

[mcanyucel]

Thank you for your work on this free library..
I was doing some tests before implementing it to my project, and I kept getting convergence error for simple quadratic functions.
For example, the code below finds the root 10 as expected:

		let x = 20;
		const fn = (x: number): number => Math.pow(x, 2);
		const fnParams = [x];

		try {
			const result = goalSeek({
				fn,
				fnParams,
				percentTolerance: 0.01,
				maxIterations: 1000,
				maxStep: 10,
				goal: 100,
				independentVariableIdx: 0
			});
			console.log("====root: " + result);
			console.log("====fn value: " + fn(result));
			
			
		} catch (e) {
			console.log("----" + e.message);
			
		}

But if I change the goal to 130, I get failed to converge error:

...
	goal: 130,
...

Any ideas or tips for quadratic or higher order polynomials?

[adam-hanna]

Interesting. It gets stuck in an infinite loop between -40 and 250.

EDIT - Decreasing the maxStep and increasing the maxIterations seems to solve it. Maybe the algo could be improved to account for that?

[mcanyucel]

Indeed, setting maxStep to 0.1 solves with the default maxIterations for goal 130 or similar numbers for x^2. Maybe quadratic functions are more susceptible to bouncing back and forth for large steps due to their higher order terms? I am really not that fluent in numerical analysis stuff to offer a lot of help or insight, though :). Possibly decreasing the step size automatically if the result gets stuck bouncing (yeah, that was not a very technical sentence) might help.

[rohit-rai-0101rm]

I am working with react and have a result table.
i want to set element of last cell 0 .
please guide on the same