Rank. The rank of *: is 0.
Thus ... @ *: has rank 0. The rank of fork is _ . *: @: fork (equivalent to [: *: fork) has rank _ , as does (*: @ fork) Henry Rich On 2/12/2023 4:46 PM, More Rice wrote:
Masters, I understand that there is an excellent reference implementation of varp in addons/stats/base/univariate.ijs to learn from, but I'm trying to do exercises to solidify my understanding of using verb trains/hooks, and the difference when using Atop. I've 2 versions of varp. #1 below is typical of what some of you do (credit: Bob's "Maximum Consecutive 1's in J." Excellent video! Thank you. I wish there were more of these.) - using cap when we want to string monadic verbs sequentially. No problem there. NB. works - using hook/fork/cap myvarp1 =: # %~ [: +/ [: *: (-+/%#) NB. works - using hook/fork/Atop and no cap myvarp2 =: # %~ +/ @ (*: @ (-+/%#)) #2 above, for some reason, I need an extra pair of parentheses to the right of the 1st @ for it to work. I don't get why. For example, the following is broken. NB. It gives me a list instead :( myvarp_broken =: # %~ +/ @ *: @ (-+/%#) Why are they (the missing parentheses w.r.t. #2) needed? thank you Maurice ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
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