Once I needed to reimplement recursion in mathlab because the stack was too small, it was an interesting experience, I had a matrix-repurposed-as-stack and did

Once I needed to reimplement recursion in mathlab because the stack was too small, it was an interesting experience, I had a matrix-repurposed-as-stack and did all the push/pop manually while the recursion ran as a loop - goes to show that recursion isn't that essential if one knows how to split state, data and code properly.