Method: Mgmg::TPolynomial#partial_derivative

Defined in:

lib/mgmg/poly.rb

#partial_derivative(variable) ⇒ Object

# File 'lib/mgmg/poly.rb', line 165

def partial_derivative(variable)
	case variable.to_s
	when /\Ac/i
		if @mat.col_size <= 1
			self.class.new(Mat.new(1, 1, 0), 28, 0, 12, 12)
		else
			mat = Mat.new(@mat.row_size, @mat.col_size-1) do |i, j|
				@mat.body[i][j+1] * (j+1)
			end
			self.class.new(mat, 28, 0, 12, 12)
		end
	when /\As/i
		if @mat.row_size <= 1
			self.class.new(Mat.new(1, 1, 0), 28, 0, 12, 12)
		else
			mat = Mat.new(@mat.row_size-1, @mat.col_size) do |i, j|
				@mat.body[i+1][j] * (i+1)
			end
			self.class.new(mat, 28, 0, 12, 12)
		end
	else
		raise ArgumentError, "the argument must be `s' or `c', not `#{variable}'"
	end
end