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    <p>First, you should always have <a href="https://stackoverflow.com/questions/8023959/why-use-strict-and-warnings">'use strict;' and 'use warnings;' pragmas in your script</a>.</p> <p>It seems like you need a simple array (<code>@param_name</code>) for reference, so loading those values would be straight forward as you have it. (again, adding the above pragmas would start showing you errors, including the <code>$line = =~ s/^\s+//;</code> line!) </p> <p>I suggest you read this, to understand how you can load your data file into a <a href="http://perldoc.perl.org/perldsc.html#HASHES-OF-HASHES" rel="nofollow noreferrer">Hash of Hashes</a>. Once you've designed the hash, you simply read and load the file data contents, and then iterate through the contents of the hash. </p> <p>For example, using time as the key for the hash</p> <pre><code>%HoH = ( 1 =&gt; { name =&gt; "Param1", ty =&gt; "UI", value =&gt; "5", }, 2 =&gt; { name =&gt; "Param3", ty =&gt; "TXT", value =&gt; "Some Text 1", }, 3 =&gt; { name =&gt; "Param1", ty =&gt; "UI", value =&gt; "10", }, ); </code></pre> <p>Make sure you close the INFILE after reading in the contents, before you start processing.</p> <p>So in the end, you iterate over the hash, and reference the array (instead of the file contents) for your output writes - I would imagine it would be <strong>much</strong> faster to do this.</p> <p>Let me know if you need more info.</p> <p>Note: if you go this route, include <a href="http://perldoc.perl.org/Data/Dumper.html/" rel="nofollow noreferrer" title="Data::Dumper">Data:Dumper</a> - a significant help to printing and understanding the data in your hash!</p>
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    1. COThat sounds promising. I was leery of building large arrays/structs etc. because of the size of the files. When I tried this in Matlab, which isn't so hot at managing memory, I would either run out of memory or start paging endlessly? So I was trying to not read too much into memory at one time. I will read up on the Hashes and give it a shot. In the end I just need arrays of time, and data (grouped by parameter) written to binary ... more or less in the format described in the Continue Block of my code sample. This is so I can plot the data vs time in Matlab
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