Re: variable number of lists

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Re^2: variable number of lists by AnomalousMonk (Archbishop) on Aug 17, 2009 at 15:33 UTC
See also the ARRAYS OF HASHES discussion in perldsc, which seems to have an example that is fairly close to your needs. Good luck with your homework! Update: The Arrays and hashes only with references tutorial may also be helpful.	[reply]
Re^2: variable number of lists by jbfamilly (Initiate) on Aug 17, 2009 at 15:22 UTC
Missed an important point. I need to know which list the data is coming from. More accurate result would be: `Day 1: fruit=apple veg=celery Day 2: fruit....` [download]	[reply] [d/l]
Re^3: variable number of lists by ssandv (Hermit) on Aug 17, 2009 at 15:31 UTC
Basically, you either know all the lists are the same length, or you extract the length of the longest one programmatically (you say you know how to make the data structure so I assume you know how to access it). Once you have that information, do a `foreach $element_num (1..$foo) {` where `$foo` is your number of elements in the longest list. For each number, you extract one element from each list with an internal foreach loop that uses `keys` to get you the individual list names. Alternately, you could make an array of arrays and just make element 0 of each row the name of that list--then it should be fairly obvious how to march across all the rows in lock-step. It depends on whether you want easy access to the data by list name.	[reply] [d/l] [select]
Re^3: variable number of lists by moritz (Cardinal) on Aug 17, 2009 at 15:24 UTC
For example by iterating over the indexes of one array, and accessing the the items "simultaneously" (whatever that means if you don't use threads...) by index.	[reply]