Loops/Increment loop index within loop body: Difference between revisions

Loops/Increment loop index within loop body (view source)

Revision as of 10:04, 23 January 2023

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J: bugfix (the initial implementation didn't quite match the requirement for display). Note that some of this content is still unreviewed

Rdm

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Revision as of 13:46, 16 October 2022 (view source) Blanvill (talk \| contribs) (→‎{{header\|Vlang}}: Rename "Vlang" in "V (Vlang)") ← Older edit		Revision as of 10:04, 23 January 2023 (view source) Rdm (talk \| contribs) (J: bugfix (the initial implementation didn't quite match the requirement for display). Note that some of this content is still unreviewed) Newer edit →
Line 2,457: =={{header\|J}}== An idiomatic approach: ~~Fun with j. The verb tacit_loop implements the computation.~~ <syntaxhighlight lang=~~"j"~~J> (,.~#\)}:(}:, (,1&p: # _1 2&p.)@:>:@{:)^:(42 >: #)^:_ x: 42 1 43 ~~tacit_loop =: _1&(>:@:{`[`]})@:(, (1&p: # _1 2&p.)@:{:)@:]^:(0 ~: (>: #))^:_ x:~~ 2 89 3 179 4 359 5 719 6 1439 7 2879 8 5779 9 11579 10 23159 11 46327 12 92657 13 185323 14 370661 15 741337 16 1482707 17 2965421 18 5930887 19 11861791 20 23723597 21 47447201 22 94894427 23 189788857 24 379577741 25 759155483 26 1518310967 27 3036621941 28 6073243889 29 12146487779 30 24292975649 31 48585951311 32 97171902629 33 194343805267 34 388687610539 35 777375221081 36 1554750442183 37 3109500884389 38 6219001768781 39 12438003537571 40 24876007075181 41 49752014150467 42 99504028301131 </syntaxhighlight> ~~Now~~A ~~derive~~variant itderived from ~~the python solution. The monadic verb loop fairly straightforwardly matches~~ the python solution (except ~~that~~this loop returns the ~~vector~~list of computed values rather than displays them.): <syntaxhighlight lang="j"> isPrime =: 1&p: