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Re^2: Data Structures

by TimButterfield (Monk)
on May 02, 2008 at 15:06 UTC ( #684187=note: print w/replies, xml ) Need Help??


in reply to Re: Data Structures
in thread Data Structures

Agreed. But, consider also how this may be extended with new data elements in the future. Compare
$Easting{$Line}{$Station}
vs
$Data{$Line}{$Station}{Easting}
For example, if you were to add lat/long or one of the misc items to Station, the second structure would more easily accommodate that new data.

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Re^3: Data Structures
by YYCseismic (Beadle) on May 02, 2008 at 16:00 UTC

    Interesting. I had thought of using a triply-nested hash, but thought it might be too complex. I guess if the code is written properly, though, it shouldn't be a problem, right?

      True. Don't be apprehensive about depth/complexity. A comment line or two may be sufficient to document the structure if you need to go back and tweak it. Here's a one line comment from something I wrote several months ago.

      polls->{lane:stage}->[row]->[col]

      This is sufficient to remind me how the data is organized. Polls are polling cycles over time for chip insertion machines which may have one or two lanes/stages. The row/col are defined by a header row of words for the column labels. Values corresponding to those header row words are in subsequent rows.

      This also illustrates one thing I frequently do. I often use and store my hashes and arrays as refs. This makes it easy to pass everything as a scaler. For example, I have one package to handle the processing of one part of the data. If I need to store that, I just get and store the ref to combine the individual pieces to a higher level. This type of organization allows the use of OO concepts others have mentioned, but does not break/remove the built-in features for using arrays or hashes. If all of your data is in one file, this may not be needed. But, it is a handy pattern that can be used in other situations.

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