![j901](https://is2-ssl.mzstatic.com/image/thumb/Purple116/v4/80/c2/a7/80c2a7e3-9cc4-450d-b499-9bb53447257a/AppIcon-1x_U007emarketing-3-85-220.jpeg/512x512bb.jpg)
J is a general purpose programming language inspired by APL, both languages springing from the fertile mind of the late Ken Iverson
![J is a general purpose programming language inspired by APL, both languages springing from the fertile mind of the late Ken Iverson](https://is2-ssl.mzstatic.com/image/thumb/Purple116/v4/80/c2/a7/80c2a7e3-9cc4-450d-b499-9bb53447257a/AppIcon-1x_U007emarketing-3-85-220.jpeg/60x60bb.jpg)
j901
![j901](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/45/fb/6e/45fb6ebb-6d51-bac9-f324-1157d3f19672/3eb9c095-0d63-42a1-bc3f-9a66af3a4d0f_home-at-startup.png/750x750bb.jpeg)
![j901](https://is3-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/08/4f/e0/084fe035-91dd-c2fa-d36f-447e7806c8cb/9e76b2c6-77a3-4f42-953f-fd73efaae116_home-tour-surface-plot.png/750x750bb.jpeg)
![j901](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/a3/c0/ff/a3c0ffb1-9a5d-71cb-9863-729b5de9a6fa/a6696fc8-c85d-4ab6-bd3c-f2e1055eeafa_plot-surface-plot.png/750x750bb.jpeg)
What is it about?
J is a general purpose programming language inspired by APL, both languages springing from the fertile mind of the late Ken Iverson. J is particularly strong in the mathematical, statistical, and logical analysis of textual and numerical data.
![j901](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/45/fb/6e/45fb6ebb-6d51-bac9-f324-1157d3f19672/3eb9c095-0d63-42a1-bc3f-9a66af3a4d0f_home-at-startup.png/750x750bb.jpeg)
App Screenshots
![j901 screenshot-0](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/45/fb/6e/45fb6ebb-6d51-bac9-f324-1157d3f19672/3eb9c095-0d63-42a1-bc3f-9a66af3a4d0f_home-at-startup.png/750x750bb.jpeg)
![j901 screenshot-1](https://is3-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/08/4f/e0/084fe035-91dd-c2fa-d36f-447e7806c8cb/9e76b2c6-77a3-4f42-953f-fd73efaae116_home-tour-surface-plot.png/750x750bb.jpeg)
![j901 screenshot-2](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/a3/c0/ff/a3c0ffb1-9a5d-71cb-9863-729b5de9a6fa/a6696fc8-c85d-4ab6-bd3c-f2e1055eeafa_plot-surface-plot.png/750x750bb.jpeg)
![j901 screenshot-3](https://is5-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/65/2c/79/652c790c-a048-5535-6de2-0e903ca30043/8926b0d3-7ea3-4b73-8f20-f95e03962477_home-tour-random-bw-mask.png/750x750bb.jpeg)
![j901 screenshot-4](https://is4-ssl.mzstatic.com/image/thumb/PurpleSource116/v4/ce/62/45/ce624548-24a0-c1ab-2ad8-5cf0a12e9122/94021ad8-968a-47af-8237-e12872fde432_slate-random-bw-mask.png/750x750bb.jpeg)
![j901 screenshot-5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/b3/9a/3a/b39a3ad9-8bbf-49dc-0f51-07726e3e7d27/05a15084-9de4-49c1-93ec-1f76650a23a7_edit-try1.png/750x750bb.jpeg)
![j901 screenshot-6](https://is3-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/e7/26/dd/e726dd12-3e84-dd8c-879d-3129b122abf9/c4a20654-4a03-4d5f-8aa5-f1d9e261b6ad_info-vocabulary-slash.png/750x750bb.jpeg)
![j901 screenshot-7](https://is2-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/55/a0/38/55a038f7-2c1b-1e9e-6b20-df6e27217404/7a0713ad-f1d3-4768-be3b-498b9f40e88d_mill-sample-1.png/750x750bb.jpeg)
App Store Description
J is a general purpose programming language inspired by APL, both languages springing from the fertile mind of the late Ken Iverson. J is particularly strong in the mathematical, statistical, and logical analysis of textual and numerical data.
j901 is the follow-on product of j701. This version of the J Integrated Development Environment (J IDE) employs version 9.3 of the J Engine.
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 first and foremost a vehicle for fun and discovery.
DO NOT USE FOR MISSION-CRITICAL WORK – iOS end-user security trumps app recovery.
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