Dhruv Madeka, a quantitative researcher at Bloomberg, describes the open source library D3 (or D3.js), which is used to make interactive data visualizations, as “awesome.” But for many would-be fans, ...

In our last installment, we introduced gnuplot, which is a standalone, language-agnostic plotting and analysis system. If you're using Python for data analysis, science, or statistics—or if you are ...