-

# File lib/matrix.rb, line 898
    def -(other)
      case other
      when Numeric
        Scalar.new(@value - other)
      when Vector, Matrix
        Scalar.Raise WrongArgType, other.class, "Numeric or Scalar"
      when Scalar
        Scalar.new(@value - other.value)
      else
        x, y = other.coerce(self)
        x - y
      end
    end