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What is the purpose of the underscore in this line of u.q
In the u.q file of the following set up, what is the purpose of the underscore here, (It doesnt appear to me to be cut or drop)
del:{w[x]_:w[x;;0]?y};.z.pc:{del[;x]each t};
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1 Reply
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Hi,
it is drop in place to modify the dictionary w of table subscriptions. It is checking the list of subs for table x, for handle y, if there is an item its dropped from the list and w[x] is updated.
section at the bottom here on drop in place:
Drop in place
Assign through Drop to delete in place.
q)show d:`a`b`c`x!(1;2 3;4;5) a| 1 b| 2 3 c| 4 x| 5
q)d _:`x
q)d a| 1 b| 2 3 c| 4Hope that helps, if not let me know.
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