method

diagonal?

v1_9_3_392 - Show latest stable - Class: Matrix

diagonal?()

public

Returns true is this is a diagonal matrix. Raises an error if matrix is not square.

# File lib/matrix.rb, line 597
  def diagonal?
    Matrix.Raise ErrDimensionMismatch unless square?
    each(:off_diagonal).all?(&:zero?)
  end