# The beauty of Mayavi

Four charges with different magnitude plotted in 3D using Mayavi

In one of my earlier posts about Mayavi, I wrote about how you could visualize 2D field line plots using the flow function. At the end of that post I added that Mayavi is actually best at 3D plotting, and to follow up on that I’ll show you some of these plots with a few example Python scripts you might try out on your own.

### Now, Enter 3D!

The way you do your plots in Mayavi depends on what you want to express. Most likely, you would prefer to show some simple plots giving just the necessary amount of information to tell you how the electric field behaves around your charges. A simple example of this is shown below:

# Using Mayavi in Fys1120 oblig 1

3D plot for exercise 2d

There are only two days left before the first mandatory exercise in Fys1120 is due. Last time I posted about Mayavi I wrote in a comment that I would give you some hints on how to use it with the oblig. Actually, there are not so many useful applications for Mayavi in this particular oblig, since most plots are 2D and are better created using scitools.

In fact, the 3D plots in this oblig might also be plotted using scitools, but I decided to use Mayavi to test it out for this particular purpose.

# Using Mayavi to visualize electric fields

Mayavi renders great field line plots.

While searching for a good Python module to visualize electric fields, I found Mayavi. Developed by Enthought, Mayavi is a very good module for visualizing a huge range of different scientific data sets. Everything from surfaces, flows and streamlines to bar charts, 3D plots and contour surfs are beautifully drawn on screen and exported to several file formats, such as PDF, PNG, EPS and more.

What I needed it for, however, was to visualize electric field lines in the course FYS1120 at the University of Oslo. We were told to use Matlab with the streamline and quiver functions, but even so, I wanted to use Python and decided to do a search and see if something similar was possible with Python. It took me some time to figure out how to use the scitools package to do streamline plots, but eventually I made it. However, these were a bit tedious to get working correctly and looked only about as good as the Matlab plots.

# The FYS1120 Weekly Assignment Post #1

There is no solution manual to the FYS1120 (electromagnetism) weekly assignments, so we tought it was a good idea to start posting suggestions to answers here with the aim that other students at fys1120 can crosscheck their answers somewhere  and eventually if they don’t agree or just want to know how the answers was obtained start a discussion about them in the comments.

We’ll try to start a system so that if others want to submit suggestions before we’ve manged to post them, they can.