Labs

Labs are one of the most useful elements of the J ecosystem. They provide an interactive way to communicate within a J session and have their origins with Ken Iverson in the 1990's long before Jupyter Notebooks. 

Constructing Labs

Labs since J806

The lab structure was revised after J805 to use text files as the basis for labs.

Labs of J805 and before

The classic labs had a slightly more complicated structure. Most of the older J labs use this format.

Some Labs in Text Form

An Idiosyncratic Introduction to J

This lab was written by Roger Hui and shows the power available to even novice J users.

Taste of J (Part 1)

The first part of a two part introduction is a more traditional introduction to J.

aste of J (Part 2)

The second part of a two part introduction is a more traditional introduction to J.

Some Tutorials/Labs

Isoparametric Shape Functions in J

The classic lab structure is revealed in this lab by David Lambert.

Kadane's Algorithm

When does an essay become a lab? This exploration of J primitives could easily be made into a lab.

Jay Taster

This is what a lab might look like if it were made into an essay.