Re^2: question for perl book & magazine authors

in reply to Re: question for perl book & magazine authors
in thread question for perl book & magazine authors

The hash trick is a nice way if the array is small enough. for huge arrays the algorhitmical/runtime trade may be worth the price to save memory.

holli, /regexed monk/

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Re^3: question for perl book & magazine authors by sauoq (Abbot) on Oct 19, 2005 at 21:18 UTC
Sure... if memory is so tight that you have to choose an O(n * m) time complexity over O(n + m) then I guess you gotta do what you gotta do. Of course, in that case (and especially if this is a routine task) you are almost certainly going to win by throwing more RAM at the problem because the larger your dataset the more (time) you are saving with the linear algorithm. Update: Also note that the additional memory you need will be relative to the smaller of your two arrays. (As a possible optimization depending, of course, on your data.) -sauoq "My two cents aren't worth a dime.";	[reply]

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Re^3: question for perl book & magazine authors
by sauoq (Abbot) on Oct 19, 2005 at 21:18 UTC

Sure... if memory is so tight that you have to choose an O(n * m) time complexity over O(n + m) then I guess you gotta do what you gotta do.

Of course, in that case (and especially if this is a routine task) you are almost certainly going to win by throwing more RAM at the problem because the larger your dataset the more (time) you are saving with the linear algorithm.

Update: Also note that the additional memory you need will be relative to the smaller of your two arrays. (As a possible optimization depending, of course, on your data.)

-sauoq
"My two cents aren't worth a dime.";

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