# Fifty Shades of J

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This is the control page for the project to put Norman Thomson's series of Vector essays *Fifty Shades of J*
on the J wiki.

- It also serves for now as the
**Table of Contents**. - Its official name is
**the Updates Page**.

For more information on the project, see **the About Page**.

Before making changes please read **the Editing Guidelines**.

### Preamble

Chapter Owner Done? Preamble Norman Thomson

### Primitives and what they can do

Chapter Owner Done? 1. every, each, and a little bit of rank Ian Clark 2. A Composition on Composition Jan-Pieter Jacobs 3. My J-oinery Workshop Bob Therriault 4. Parallel Joins Pascal Jasmin (talk) 5. Conjugacy and Rank Chris Burke 6. Punctuation and Rank Daniel Lyons 7. One Foot in the Grade Don Guinn 8. Transpositions, Perms and Combs Don Guinn 9. Power Steering extra Don Guinn 10. Bonding is Power – how Interesting Don Guinn 11. Time for amendment of data Don Guinn 12. Obverse to Adverse :.:: a trip along the Brailleway Brian Schott 13. If you think J is complex try j Dan Abell 14. j is complex? You bet! John Baker 15. Cancel, cancel little fraction Devon McCormick 16. Thinking by numbers Brian Schott

### Language Philosophy

Chapter Owner Done? 17. Jaesthetics Bob Therriault 18. The problem with J is … Vijay Lulla 19. Symphony in J minor, op.31 Vijay Lulla 20. How to Do Things with Words Chris Burke 21. Are you thinking what I’m thinking? John Baker 22. Index Lists, Grade Lists, and some simple joins Chris Burke

### Problem Solving

Chapter Owner Done? 23. Some Numerical Problems Analysed in J Dan Abell/David Lambert -> needs test 24. Here we go round ... and round and round ... Ric Sherlock 25. Two for the Price of One Ric Sherlock 26. Working in Groups Ian Clark 27. All but one Brian Schott

### Statistics and Combinatorics

Chapter Owner Done? 28. Have you a weight on your mind? Ric Sherlock 29. Just say it in J - ANOVA Ric Sherlock 30. Just what do they sell at C. and A.? Ian Clark 31. A rippling good yarn Jim Russell 32. So Easy a Child of 10 … Jan-Pieter Jacobs 33. Perming and Combing Devon McCormick 34. Combination Lists Devon McCormick

### Simulation and Operational Research

Chapter Owner Done? 35. How many Obtuse angled triangles are there? David Lambert 36. ... the stylish part of Vector Jan-Pieter Jacobs 37. Greed : patterns for the collapse of Western capitalism David Mitchell 38. Shortest Paths Jan-Pieter Jacobs

### Codes and Ciphers

Chapter Owner Done? 39. The I-spy book of J Brian Schott 40. The I-spy book of J part 2 Brian Schott 41. Suffer the little children …… to bring along their equations Brian Schott

### More Problem Corners

Chapter Owner Done? 42. Fifty ways to tell a fib David Mitchell 43. Seeds, Cones and Sunflowers Chris Burke 44. Catalan Numbers Chris Burke 45. A partial solution to a partial problem Jan-Pieter Jacobs 46. Tables and Geometry {username} 47. Musical J-ers Chris Burke 48. Heavens above! {username} 49. Financial Maths and J – part 1, IRR and APR Devon McCormick 50. Financial Maths and J – part 2; Growth Rates {username}

### Appendix

Chapter Owner Done? Topics Index Norman Thomson Vocabulary Index Norman Thomson