Introduction to the Modeling and Analysis of Complex Systems

238 CHAPTER 13. CONTINUOUS FIELD MODELS I: MODELINGAnd here is how to draw a contour plot of the same scalar field:Code 13.2: plot-contour.pyfrom pylab import *xvalues, yvalues = meshgrid(arange(-5, 5.5, 0.05), arange(-5, 5.5, 0.05))zvalues = sin(sqrt(xvalues**2 + yvalues**2))cp = contour(xvalues, yvalues, zvalues)clabel(cp)show()The clabel command is used here to add labels to the contours. The result is shown inFig. 13.7.40.2500.000-0.250-0.5000.000-0.5000.5000.2502-0.7500.250-0.250-0.25000.5000.7502-0.5004-0.2500.000-0.7500.0000.5000.750-0.500-0.7504 2 0 2 4-0.2500.000-0.5000.250Figure 13.7: Scalar field visualized as a contour plot using Code 13.2.If you want more color, you can use imshow, which we already used for CA:Code 13.3: plot-imshow.py