Monks, I'm trying to extract information from a tab delimited file that may contain an unlimited number of columns. The first part of the OPENPYC routine opens the file, the second part linear interpolates data for days that are not given in the original file. The print lines inside the subroutine are for testing purposes. The hashes that get created are used later to extract the data to use in a rather complex fish growth model which I have not shown here. For some reason, when the *.pyc file has zeros in it, as in the example Muskie.pyc my script does not recognie the datum. I've adaped this scipt from an earlier script that by definition had only two possible columns (a *.tem file, shown below) which I've just discovered also has a problem handling zero in the linear interpolation portion of the script. Where have I gone wrong? I'm fairly new to perl, and this is my first post at perlmonks. I hope this post is up to par, and thank you in advance for any help. 
Contents of tab delimited files, $PYCFILE:

Muskie.pyc
day    invertebrates    fish
1    1    0
183    0    1
365    0    1

[download]
Northern Pike.pyc
day    invertebrates    fish
1    3000    4000
365    3000    4000

[download]
#!/usr/bin/perl
#Working With *.pyc files

sub PYCFILENAMEASSIGNMENT{
$PYCFILE = "$FishSpecies".".pyc";
}

sub OPENPYC{

@dayvalues = ();
open PYCFILE, "/Applications/Bioenergetics/User\ Input\ Data\ Files/$P
+YCFILE" or die "Cannot open $PYCFILE: $!";
@dailypyc=<PYCFILE>;
shift(@dailypyc);
###I believe the problem is in here.
foreach $line (@dailypyc){
    
    print "\n";
    chomp($line);
    @pyclinevalues=split("\t",$line);
    $day = $pyclinevalues[0];
    chomp($day);
    print "Day $day\t";
    push (@dayvalues,$day);
    shift(@pyclinevalues);
    $totalnumberofpycpreyitems = scalar (@pyclinevalues);
    $scalarcounter = 0;
        
        while($pyclinevalues[0]){
        $pyc = $pyclinevalues[0];
        chomp($pyc);
        print "Endens $pyc\t";
        push (@{pycvalues."$scalarcounter"},$pyc);
        $scalarcounter = $scalarcounter + 1;
        shift(@pyclinevalues);
        }
    
    }
close (PYCFILE);
###
$scalarcounter = 0;
$PYCLININTERPLOOP = 1;
until($PYCLININTERPLOOP > $totalnumberofpycpreyitems){

    @projectedpycvalues = ();
    if(${pycvalues."$scalarcounter"}[1]){
        $projecteddeltay = ${pycvalues."$scalarcounter"}[1] - ${pycval
+ues."$scalarcounter"}[0];
        chomp ($projecteddeltay);
        $projecteddeltax = $dayvalues[1] - $dayvalues[0];
        chomp ($projecteddeltax);
        $newvalue = ${pycvalues."$scalarcounter"}[0];
        chomp ($newvalue);
        $projectedslope = $projecteddeltay/$projecteddeltax;
        chomp ($projectedslope);
        push (@projectedpycvalues,$newvalue);
        $checker = $dayvalues[0];
        chomp ($checker);
        $checker = $checker + 1;

        if($checker < $dayvalues[1]){
            until($checker == $dayvalues[1]){
            $newvalue = $newvalue + $projectedslope;
            push (@projectedpycvalues,$newvalue);
            $checker = $checker + 1;
            }
        }

        if($checker == $dayvalues[1]){
            $newvalue = ${pycvalues."$scalarcounter"}[1];
            push (@projectedpycvalues, $newvalue);
            $checker = $checker + 1;
            }
        }

    $PYCLOOPCOUNTER = 2;
    $totalnumberofpycdatapoints = scalar (@pycpvalues);
        until($PYCLOOPCOUNTER > $totalnumberofpycdatapoints){
            if(${pycvalues."$scalarcounter"}[2]){
                $projecteddeltay = ${pycvalues."$scalarcounter"}[2] - 
+${pycvalues."$scalarcounter"}[1];
                chomp ($projecteddeltay);
                $projecteddeltax = $dayvalues[2] - $dayvalues[1];
                chomp ($projecteddeltax);
                $newvalue = ${pycvalues."$scalarcounter"}[1];
                chomp ($newvalue);
                $projectedslope = $projecteddeltay/$projecteddeltax;
                chomp ($projectedslope);

                if($checker < $dayvalues[2]){
                    until($checker == $dayvalues[2]){
                        $newvalue = $newvalue + $projectedslope;
                        push (@projectedpycvalues,$newvalue);
                        $checker = $checker + 1;
                        }
                    }

                if($checker == $dayvalues[2]){
                    $newvalue = ${pycvalues."$scalarcounter"}[2];
                    push (@projectedpycvalues, $newvalue);
                    $checker = $checker + 1;
                    }
            }

        shift(@dayvalues);
        shift(@pycvalues);
        $PYCLOOPCOUNTER = $PYCLOOPCOUNTER +1;
        }

    print "@projectedpycvalues\n\n";
    $totalnumberofdays = scalar (@projectedpycvalues);
    
    $day = 1;
    foreach $value (@projectedpycvalues){
        chomp($value);
        $dailypyctable{$day} = $value; 
        $day = $day + 1;
        }
    $scalarcounter = $scalarcounter + 1;
    %{dailypyctable."$scalarcounter"} = %dailypyctable;
    $PYCLININTERPLOOP = $PYCLININTERPLOOP + 1;
    }
}

print"Species?\n";
chomp($FishSpecies = <STDIN>);
&PYCFILENAMEASSIGNMENT;
&OPENPYC;

[download]
Contents of Tab Delimited Files, $TEMFILE

Some Fish.tem

day    temperature
1    19
30    25
61    25
92    25
122    19.3
153    10
180    5
214    4
304    5
334    10.5
365    18.3

[download]
as opposed to this *.tem file which contains a zero, and 

day    temperature
1    15
30    20
61    20
92    20
122    15
153    7
180    2
214    0
304    2
334    8
365    15

[download]
#!/usr/bin/perl
sub TEMFILENAMEASSIGNMENT{
$TEMFILE = "$FishSpecies".".tem";
}

sub OPENTEM{

@dayvalues = ();
open TEMP, "/Applications/Bioenergetics/User\ Input\ Data\ Files/$TEMF
+ILE" or die "Cannot open $TEMFILE: $!";
@dailytemp=<TEMP>;
shift(@dailytemp);
foreach $line (@dailytemp){
    chomp($line);
    ($day,$temp)=split("\t",$line);
    chomp($day);
    chomp($temp);
    print "$day, $temp\n";
    push (@dayvalues,$day);
    push (@tempvalues,$temp);
    }
close (TEMP);

if($tempvalues[1]){
    $projecteddeltay = $tempvalues[1] - $tempvalues[0];
    chomp ($projecteddeltay);
    $projecteddeltax = $dayvalues[1] - $dayvalues[0];
    chomp ($projecteddeltax);
    $newvalue = $tempvalues[0];
    chomp ($newvalue);

    $projectedslope = $projecteddeltay/$projecteddeltax;
    chomp ($projectedslope);
    push (@projectedtempvalues,$newvalue);
    $checker = $dayvalues[0];
    chomp ($checker);
    $checker = $checker + 1;


        if($checker < $dayvalues[1]){
            until($checker == $dayvalues[1]){
                $newvalue = $newvalue + $projectedslope;
                push (@projectedtempvalues,$newvalue);
                $checker = $checker + 1;
                }
            }

        if($checker == $dayvalues[1]){
            $newvalue = $tempvalues[1];
            push (@projectedtempvalues, $newvalue);
            $checker = $checker + 1;
            }
    }

$TEMLOOPCOUNTER = 2;

$totalnumberoftemdatapoints = scalar (@tempvalues);
until($TEMLOOPCOUNTER > $totalnumberoftemdatapoints){
    if($tempvalues[2]){
        $projecteddeltay = $tempvalues[2] - $tempvalues[1];
        chomp ($projecteddeltay);
        $projecteddeltax = $dayvalues[2] - $dayvalues[1];
        chomp ($projecteddeltax);
        $newvalue = $tempvalues[1];
        chomp ($newvalue);
        
        $projectedslope = $projecteddeltay/$projecteddeltax;
        chomp ($projectedslope);

        if($checker < $dayvalues[2]){
            until($checker == $dayvalues[2]){
            $newvalue = $newvalue + $projectedslope;
            push (@projectedtempvalues,$newvalue);
            $checker = $checker + 1;
            }
        }

        if($checker == $dayvalues[2]){
            $newvalue = $tempvalues[2];
            push (@projectedtempvalues, $newvalue);
            $checker = $checker + 1;
            }
        }

    shift(@dayvalues);
    shift(@tempvalues);
    $TEMLOOPCOUNTER = $TEMLOOPCOUNTER +1;
    }

print "@projectedtempvalues";
$totalnumberofdays = scalar (@projectedtempvalues);

$day = 1;
foreach $value (@projectedtempvalues){
    chomp($value);
    $dailytemptable{$day} = $value; 
    $day = $day + 1;
    }

}

print"Species?\n";
chomp($FishSpecies = <STDIN>);
&TEMFILENAMEASSIGNMENT;
&OPENTEM;

[download]

In reply to Problems With Tab Delimited Files by tom10animal

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