method

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v1_8_7_72 - 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 524
  def -(m)
    case m
    when Numeric
      Matrix.Raise ErrOperationNotDefined, "-"
    when Vector
      m = Matrix.column_vector(m)
    when Matrix
    else
      x, y = m.coerce(self)
      return x - y
    end
    
    Matrix.Raise ErrDimensionMismatch unless row_size == m.row_size and column_size == m.column_size
    
    rows = (0 .. row_size - 1).collect {
      |i|
      (0 .. column_size - 1).collect {
        |j|
        self[i, j] - m[i, j]
      }
    }
    Matrix.rows(rows, false)
  end

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