Just a couple of physics notes: I wrote r as a scalar. This is the magnitude of the vector r.; The 1 over 4πε 0 is just a constant.; Electric potential is a scalar quantity, not a vector.

Examples of neat Python and Matlab plotting and other tasks & hacks ... masked_array_demo.py. ... hack to work around Matlab R2014b/R2015a removal of contour(), contourf() and contour3() handle ...

In this exercise, you will visualize a 2-D array repeatedly using both plt.contour() and plt.contourf(). You will use plt.subplot() to display several contour plots in a common figure, using the ...