In some cases it may be interesting to generate standing waves for visualization or analysis/synthesis of reflection on media or otherwise. A simple expression is presented that allows the user to plot standing waves with various reflection coefficients, amplitudes and wave numbers. The three tools we have used to do this are,  GNUPLOT ( available free on the web), MATLAB and MS Excel. Please view this expression at http://www.signalprop.biz/standing_waves.pdf