This interactive module shows the Bode magnitude plot of a single-input-single output linear time invariant dynamic system. The poles and zeros can be changed by dragging them around in the complex plane. Also, the transfer function can be changed by entering coefficients for the numerator and denominator polynomials separated by commas in the boxes below. For example, to obtain the transfer function $$G(s) = \frac{s+3}{s^2 + s + 2} $$ enter 1,3 in the box for the numerator and 1,1,2 in the box for the denominator and click plot.