Re^4: Fastest way to lookup a point in a set

There is also the issue of locales and the radix char when non-integer values are used with multidimensional hash keys.

If one has coordinates

[5,   5.5]
[5.5, 5  ]
[download]

then using the multidimensional hash approach in a locale where both $; and the radix char are a comma would result in ambiguous keys:

{5,5,5}
{5,5,5}
[download]

I know the original post specifies signed ints, so I'm just being more generic here. I also haven't checked if there is locale specific behaviour of $;

Comment on Re^4: Fastest way to lookup a point in a set Select or Download Code

Replies are listed 'Best First'.
Re^5: Fastest way to lookup a point in a set by LanX (Saint) on Aug 07, 2017 at 10:17 UTC
From the docs: The default subscript separator is "\034", the same as SUBSEP in awk It's not `","` , that's just the placeholder in Perl's syntax. I don't know and can't think of any number format or localization which uses `chr(28)` . Printable characters start from `chr(32)` onwards. update to avoid confusion hex, oct, dez `perl -e "print 0x1c,034,28" 282828` [download] Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l] [select]
Re^6: Fastest way to lookup a point in a set by swl (Prior) on Aug 07, 2017 at 23:53 UTC
Thanks for clarifying. Here are some more examples for those reading later and who haven't previously had to work with non-printing characters in this way (e.g. me a few hours ago): `# default $; does not print perl -e 'print join $;, 1..5' 12345 # but $; is still in the string perl -e '@x = split ($;, join ($;, 1..5)); print join ":", @x' 1:2:3:4:5` [download] That still does leave the issue of debugging using print statements, as `[5,55]` and `[55,5]` will both print as `555` on a terminal. The point is effectively moot, though, as the other posts have shown multidimensional indexing is slower and should probably not be used in this case.	[reply] [d/l] [select]

update