[Jgeneral] "Learning J" new edition available

[Roger Stokes]

"Learning J" is available in a new edition, dated March 2013. It is here:
www.rogerstokes.free-online.co.uk/learningj.htm

There are two new chapters, on Sparse Arrays and Performance, and some small 
improvements throughout.

Comments and criticisms are invited.

Regards. 


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