erik_friis
New Contributor III
since ‎2015.06.09
4 weeks ago

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Hi, For the last several years I have been working on a manuscript which is now at around 500 pages and includes quite a bit of high-quality material on Kdb+/q that cannot be found anywhere else. I'm looking a motivated individual of two--someone who...
Although take with lists seems to work fine, drop seems to have an issue. Thoughts? q)show rct:(`a`b`c!1 2 3;`a`b`c!4 5 6)!`x`ya b c| -----| -1 2 3| x4 5 6| y / produce dictionary (bug?)q)(enlist 1 2 3)_rct1 2 3| x 4 5 6| y / produce right-cross-tabq...
Reading up on compositions and I see that one is created with the prefix form:'[f;g]Is there no infix form in q?f'g signals an exception.In k4 however both of these work--I would have expected them to be equivalent but they are not. f'g{x+y}'[{x*y}] ...
I don't see this as the proper behavior of an adverb composition, but I suppose I can be persuaded otherwise q)a:(')[sum] /this application creates the expected derived functionq)asum'q)b:('')[sum] / '' should be an adverb projection, since the oper...
q)a:([]c1:`xx`xx`xx`yy`yy;c2:`a`b`a`a`b;c3:10 20 30 40 50)q)ac1 c2 c3--------xx a 10xx b 20xx a 30yy a 40yy b 50q)rct:exec sum c3 by c1,c2 from aq)rctc1 c2| -----| --xx a | 40xx b | 20yy a | 40yy b | 50q)select from rct'type [0] select from rct ^q)ex...