No, I'm not trying to get the full program written completely in C by you guys. I only need some way to implement the functionalities of each function I found confusing.

In this challenge in Code Golf CD, I have to make a program that computes the determinant of a two-dimensional array. It also has a program written in JavaScript that solves the challenge which looks like this:

function laplaceDet(matrix) {
	if (matrix.length === 1) return matrix[0][0];

	let sum = 0;
	for (let rowIndex = 0; rowIndex < matrix.length; ++rowIndex) {
		let minorMatrix = matrix.filter((_, index) => index !== rowIndex)
			          .map(row => row.slice(1));
		sum += ((-1) ** rowIndex) * matrix[rowIndex][0] * laplaceDet(minorMatrix);
	}
	return sum;
}

I want to challenge myself into using C for solving the challenge. First, I'll need to reimplement the program, whereas the golfing part will be dealt with later, although I've already been golfing it. Here's what I got so far.

Why'd I stop? There's a function named filter() and I'm not so sure how to get it implemented, and since C has no maps (at least I think none exist in C), it's also difficult to complete the program without it.

So I'll have to improvise... How? How do I implement the filter() method, maybe without using a function to save bytes, and what's a C equivalent to the line of code matrix.filter((_, index) => index !== rowIndex).map(row => row.slice(1));?

posted over 3 years ago

CC BY-SA 4.0

3y ago by Moshi‭

General Sebast1an‭

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