[Jprogramming] 2!:2 hasn't worked since j902?

I get a domain error evaluating (2!:2) on linux in both j903 and j904. It works as expected in j902. I'm running from the installation zips on Ubuntu 18.04.6 LTS (GNU/Linux 4.15.0-65-generic x86_64). JVERSION Engine: j904/j64/linux Beta-g: commercial/2022-10-04T00:00:39 Library: 9.04.04 Platfo

Re: [Jprogramming] amends truly in place?

Have you tried stored data as a vector and the linear index of the item into another vector? Final step would be fill in data into a sparse vector and then reshape it into rank 2. However 37% filled is not that sparse , IMO sparse meant at most a few percent filled. Use of sparse array for 37% is

[Jprogramming] NYCJUG meeting Wednesday, October 19th, 18:330 EST

Thanks to Dan Hirschi for pointing out that October 19th is a Wednesday. -- Devon McCormick, CFA Quantitative Consultant -- For information about J forums see http://www.jsoftware.com/forums.htm

[Jprogramming] amends truly in place?

This was my original code which ran  `forever'.  Were the amendments truly in place?  One array is sparse, the other pre-allocated.  Comments show observations on task manager.  I don't have much experience with Windows beyond the usual Office programs.  (PS. I now realize I could have discarde