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Understanding this line from vanilla tick set up
I’m wondering what this part of the line, it is a conditional does: not min(`time`sym~2#key flip value@)each t
In particular why there is an @ Appy here?
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2 Replies
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It’s creating a unary projection / composition for the part in brackets, could achieve the same with a lamda function:
q)(`time`sym~2#key flip value@) ~[`time`sym]#[2]!+@[.:]
q)(`time`sym~2#key flip value@) each t 110b q){`time`sym~2#key flip value x} each t 110b
* there is an overhead with using lambdas so in tick it’s preferred to be as efficient as possible
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Where
u,v,w, etc. are unaries thenu v w@is a unary composition equivalent to{u v w x}.In this case two of the five unaries are projections. A little spacing clarifies:
(`time`sym~ 2# key flip value@) each t
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