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Re: File Manipulation - Need Advise!

by Codon (Friar)
on Jan 03, 2008 at 18:57 UTC ( #660296=note: print w/replies, xml ) Need Help??

in reply to File Manipulation - Need Advise!

You didn't mention this, but if order matters in some way, you would might want two data structures, one to unique the output (a hash) and one to maintain ordering (an array). I don't know if you have seen this with the previous examples, but the header line could get mixed into the file somewhere (randomly, thanks to the hashing algorithm) unless handled separately. Alternatively, I provide this quick example:
#!/usr/bin/perl use strict; use warnings; my @order; my %data; while (<DATA>) { my ($key,$value) = split /\t/, $_, 2; push @order, $key; $data{$key} = $value; } for my $key (@order) { printf("%s\t%s", $key, delete $data{$key}) if ($data{$key}); } __DATA__ COMPUTER DISTRIBUTION_ID STATUS 30F-WKS `1781183799.xxxx1' IC--- 30F-WKS `1781183799.xxx11' IC--- ADM34A3F9 `1781183799.41455' IC---
Ivan Heffner
Sr. Software Engineer, Inc.

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[GrandFather]: However, by the end of the day I had discovered its deceptions and now have it working correctly, so yes, all's well that ends well. :-D
[Corion]: GrandFather: Ah, (hardware) APIs - I have a similar situation with Chrome and its API... It is fairly underdocumented and I guess I have to hunt...
[Corion]: ... down supposedly working code to find out what I'm supposed to do
[GrandFather]: I haven't any "working code" to inspect! I have to find ways to generate reference signals then check the numbers I get at the far end match.
[GrandFather]: That's ok when the signal is a voltage, but there are three axis accelerometers, gyroscopes and magnetometers in these things! A little invention is needed at times!
[Corion]: GrandFather: Yeah, in that aspect, hardware is far more a black box than software
[GrandFather]: Oh, and the manufacturer tells lies too! I'm sure they don't mean to, but I know for sure some of the stuff they say is just wrong. It's possible they don't understand what we are asking, but that's not a good look either
[Corion]: GrandFather: Ah, unit testing hardware is fun, especially when the hardware is uncalibrated ...
[GrandFather]: Us: "What scaling do we need to apply to the numbers from the SDK for the wibble?". Them: "Oh, the numbers from the SDK for the wibble are already correct, they don't need scaling"

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