TAU=:2p1 NB. tauday.com
NB. round y to nearest multiple of x round=: 1&$: :([*[:<.1r2+%~) round 4.5 5 3 round 4.5 6 round&.:+. 22j10 * ^j.TAU*15% 360 19j15 NB. x the angle, y the point NB. round "under" expression as Re Im vector rotate=: [: round&.:+. (* [: ^ [: j. [: %/ ,&(360 , TAU))~ 15 rotate 22j10 19j15
Date: Thu, 7 Dec 2023 11:48:26 -0500 From: "'PMA' via Programming"<programm...@jsoftware.com> To:programm...@jsoftware.com Subject: Re: [Jprogramming] A Dot-Graph Rotator Message-ID:<370d931d-42eb-6de0-6a75-3454b0d0c...@eskimo.com> Content-Type: text/plain; charset=UTF-8; format=flowed A slightly different approach. Rather than search out all alignments and then deduce their degrees of rotation, I mean now to specify as input the degrees for which rotations are to be generated. Example: given a graph of one dot -- 22j10 -- I'd input that value with a rotation choice -- 15 degrees counterclockwise -- and expect a single integer-rounded output value of approximately 19j15. (Those two "15"s are coincidental.) My question is, what J syntax will generate that output? Thanks again for your consideration! Peter A
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