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A comment on A look at the J language: the fine line between genius and insanity.

Re:A look at the J language: the fine line between genius an... by lrm242 on Wednesday September 19, 2012 @08:16AM (#4543174)
A relevant question on the Quantitative Finance StackExchange as to whether J/JDB can be used as an effective replacement for Q/KDB+ can be read here: http://quant.stackexchange.com/questions/1870/can-the-j-lang...
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Re:A look at the J language: the fine line between genius an... by sedachv on Wednesday September 19, 2012 @03:50PM (#4545227)
From what I understand, J has a lot of problems with efficient implementation because array ranks (multi-dimensional arrays) influence how operations are carried out (http://jsoftware.com/help/learning/07.htm), and the ranks are not known in advance. [ranks also have horribly complicated semantics: http://www.jsoftware.com/papers/rank1.htm]

K doesn't have this problem because it only has vectors.

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