Re: Looking for a good way to split a file into equal sized arrays

I agree that you need a flag to determine whether or not you are in a block, but beyond that, you need a datatype to hold all your data. I think you want an array of blocks that contains an array of lines that consists of an array of elements. This ought to do the trick:

use Data::Dumper;

sub readFile{
    open my $fh, "resource/datafile.txt" || die "Cannot open: $!";
    @lines = <$fh>;
    $inblock = 0;
    my @block = [];shift @block;
    while($#lines >= 0){
        my $single = shift @lines;
        print $single;
        if($single =~ /END DATA/){
            $inblock = 0;
            push @allblocks,[@block];
            @block = [];shift @block;
        }
        push @block,[split ' ',$single] if $inblock;
        $inblock = 1 if($single =~ /START DATA/);
    }
}

readFile;
print Dumper(\@allblocks);
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When a block starts the flag begins, and when a block ends the block is added to @allblocks. I don't consider myself a monk yet, but I tried the code and it works.

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Re^2: Looking for a good way to split a file into equal sized arrays by Luken8r (Novice) on Nov 26, 2007 at 21:21 UTC
Thanks for all the suggestions, folks. While that flip flop did work out as anticipated, it turns out thats not exactly what I thought I needed What I ended up doing was sending all the data in the file to an array then incrementing the elements of that array in a for loop. Inside that for loop, I set a few triggers via a switch. Since the beginning value of each line tells me what sort of data it contains, I then split each line depending on what it was: {{{vars}}} my $infile = <STDIN>; print"Your input file is $infile\n\n"; open (INFILE, "<$infile")\|\|die "no such file"; while (<INFILE>) { @data = <INFILE>; for ($x = 0; $x<=$#data; $x++){ chomp ($data[$x]); switch ($data[$x]){ # If start of section, increment array by 3 to skip header # case /^Begin Targets/ { $x += 3; } case /^0 / { # do not want last; } case /^1 / { @line = split(/ /,$data[$x]); # Get data out last; } case /^2 / { @line = split(/ /,$data[$x]); # Get data out last; } case /^3 / { @line = split(/ /,$data[$x]); # Get data out last; } # end case3 } # end switch } # end for } #end [download] In each case I can take the line and set it to some variable depending on which place in the field I want, `$DistX[$x] = $line[2]; $DistY[$x] = $line[3];` [download] ...etc Well Im half way there, Now I just need to output this data to a csv spreadsheet to plot it...but thats for tomorrow :)	[reply] [d/l] [select]

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Re^2: Looking for a good way to split a file into equal sized arrays
by Luken8r (Novice) on Nov 26, 2007 at 21:21 UTC

{{{vars}}}
my $infile = <STDIN>;
print"Your input file is $infile\n\n";

open (INFILE, "<$infile")||die "no such file";

while (<INFILE>) {

@data = <INFILE>;
    for ($x = 0; $x<=$#data; $x++){
    chomp ($data[$x]);
    switch ($data[$x]){
# If start of section, increment array by 3 to skip header
#
        case /^Begin Targets/ {
               $x += 3;
            }
            case /^0 / {
            # do not want
                last;
            
            } case /^1 / {
              @line = split(/ /,$data[$x]);
            # Get data out
              last;
            } case /^2 / {
              @line = split(/ /,$data[$x]);
            # Get data out
              last;
            } case /^3 / {
              @line = split(/ /,$data[$x]);
            # Get data out
              last;
          } # end case3
      } # end switch
  } # end for
} #end
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    $DistX[$x] = $line[2];
    $DistY[$x] = $line[3];
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