IDL

IDL, short for Interactive Data Language, is a programming language used for data analysis.

It is popular in particular areas of science, such as astronomy, atmospheric physics and medical imaging.

IDL shares a common syntax with PV-Wave and originated from the same codebase, though the languages have subsequently diverged in detail.

There are also free or costless implementations, such as GNU Data Language (GDL) and Fawlty Language (FL).