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JadenGeller/TriangularMatrixIndexUtils.swift

Created April 4, 2024 01:04
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TriangularMatrixIndexUtils.swift
func triangularMatrixIndex(row: Int) -> Int {
row * (row + 1) / 2
}
func triangularMatrixCoordinate(_ index: Int) -> (row: Int, column: Int) {
let row = Int(sqrt(2 * Float32(index) + 0.25) - 0.5)
let column = index - triangularMatrixIndex(row: row)
return (row: row, column: column)
}
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https://cs.stackexchange.com/a/155953

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