This new version of the J Integrated Development Environment (J IDE) employs version 9.3 of the J Engine (JE). How J901 differs from J701: * Abandons special keyboard for custom keys on system keyboard * Session log display, whole or part, e.g. inputs-only; or transactions containing a given J primitive or substring * Code editor, with tabs and find facility * Shell-type preprocessor for common housekeeping actions upon jscripts and other files * Separate scenes for displaying the output from "plot" and "viewmat" * Context-sensitive Help; NuVoc lookup * New "Mill" feature for studying noun transformations, e.g. numeric arrays and animated character-graphics such as Conway's Game Of Life Like all J IDEs, this iOS app is offered free of charge as a learning resource for teachers and students of mathematics, statistics, science and engineering. It is also offered without guarantee as a convenience to J experts who normally use a desktop computer for their professional work. Fine-tuned to the iPad, but usable on iPhone, it is less of a professional IDE than a vehicle for fun and discovery.
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