method

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v2_1_10 - Show latest stable - 0 notes - Class: Matrix

1_8_6_287 (0)
1_8_7_72 (0)
1_8_7_330 (0)
1_9_1_378 (-5)
1_9_2_180 (0)
1_9_3_125 (0)
1_9_3_392 (0)
2_1_10 (0)
2_2_9 (0)
2_4_6 (0)
2_5_5 (0)
2_6_3
What's this?

-(m) public

Matrix subtraction.

Matrix[[1,5], [4,2]] - Matrix[[9,3], [-4,1]]
  => -8  2
      8  1

Show source

# File lib/matrix.rb, line 865
  def -(m)
    case m
    when Numeric
      Matrix.Raise ErrOperationNotDefined, "-", self.class, m.class
    when Vector
      m = self.class.column_vector(m)
    when Matrix
    else
      return apply_through_coercion(m, __method__)
    end

    Matrix.Raise ErrDimensionMismatch unless row_count == m.row_count and column_count == m.column_count

    rows = Array.new(row_count) {|i|
      Array.new(column_count) {|j|
        self[i, j] - m[i, j]
      }
    }
    new_matrix rows, column_count
  end

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