method

basis

v2_4_6 - Show latest stable - Class: Vector

basis(size:, index:)

public

Returns a standard basis n-vector, where k is the index.

Vector.basis(size:, index:) # => Vector[0, 1, 0]

# File lib/matrix.rb, line 1762
  def Vector.basis(size,, index))
    raise ArgumentError, "invalid size (#{size} for 1..)" if size < 1
    raise ArgumentError, "invalid index (#{index} for 0...#{size})" unless 0 <= index && index < size
    array = Array.new(size, 0)
    array[index] = 1
    new convert_to_array(array, false)
  end

basis

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