However, when posting a new package it is most useful to discuss it in comparison to established packages. Specifically, what are the pros/cons of this package compared to numericjs [1] and jstat [2]?
Also, in general, I think it is a mistake to mix plotting and numerics in a single package. These are two quite different things and are probably better served by more focused packages.
[1] http://www.numericjs.com/ [2] https://github.com/jstat/jstat
There is some overlap between those libraries. However, it does one thing that none of the other JS libraries (from here: http://jster.net/category/math-libraries) really focus on: to support the full complex domain for all the functions.
About numerics vs plotting: They are in different js files, jsmat.js and jsmat_plot.js. The plotting file depends on the numerics one though, as it needs to use its Complex type. The main focus of the package is the numerics, the plotting is a demo, and especially, debugging device.