Re^2: How to get this not the usual round robin looping

chapeau for your solutions, but while i was reading them to appreciate how bad i was to not studied math (quite at all), i realized that your two push lines work only for 0 to 3. has your math solution the possibility to abstract this and using the index of a variable @K?

thanks
L*

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Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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Re^3: How to get this not the usual round robin looping by hdb (Monsignor) on Oct 14, 2015 at 08:47 UTC
Well spotted! Right now I cannot think of something as terse as this for the general solution. The `$i&4` basically tells the ups and downs and would need to be replaced by something like `int($i/@K)&1` (not tested). The line based on `sin` will not work for large arrays `@K` as `sin` is not linear enough for that... Update: This should work: `push @{ $hash{ $K[ int(++$i/@K)&1 ? @K-1-$i%@K : $i%@K ] } }, $_ for @ +V;` [download]	[reply] [d/l] [select]

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Re^3: How to get this not the usual round robin looping
by hdb (Monsignor) on Oct 14, 2015 at 08:47 UTC

Well spotted! Right now I cannot think of something as terse as this for the general solution. The $i&4 basically tells the ups and downs and would need to be replaced by something like int($i/@K)&1 (not tested). The line based on sin will not work for large arrays @K as sin is not linear enough for that...

Update: This should work:

push @{ $hash{ $K[ int(++$i/@K)&1 ? @K-1-$i%@K : $i%@K ] } }, $_ for @
+V;
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