// Matrix operations.

// **Matrix** is a utility class to help with matrix operations. A
// matrix is implemented as an n-element array. Data is stored in row-major
// order.

export const copy = (matrix) => matrix.map((row) => [...row])

export const equals = (l, r) =>

  return false unless l.length is r.length
  return true if l.length is 0
  return false unless l[0].length is r[0].length

  for lrow, y in l
    rrow = r[y]
    for lindex, x in lrow
      unless lindex is rrow[x]
        return false

  return true

export const size = (matrix) =>

  return 0 if 0 is matrix.length
  return matrix.length * matrix[0].length

export const sizeVector = (matrix) =>

  return [0, 0] if 0 is matrix.length
  return [matrix[0].length, matrix.length]