method

**

v1_9_2_180 - Show latest stable - 0 notes - Class: Matrix

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What's this?

**(other) public

Matrix exponentiation. Currently implemented for integer powers only. Equivalent to multiplying the matrix by itself N times.

Matrix[[7,6], [3,9]] ** 2
  => 67 96
     48 99

Show source

# File lib/matrix.rb, line 697
  def ** (other)
    case other
    when Integer
      x = self
      if other <= 0
        x = self.inverse
        return Matrix.identity(self.column_size) if other == 0
        other = -other
      end
      z = nil
      loop do
        z = z ? z * x : x if other[0] == 1
        return z if (other >>= 1).zero?
        x *= x
      end
    when Float, Rational
      Matrix.Raise ErrOperationNotImplemented, "**", self.class, other.class
    else
      Matrix.Raise ErrOperationNotDefined, "**", self.class, other.class
    end
  end

**

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