Hello!

I have to plot several diagramms and want to do it with chart::gnuplot.

It needs the x and y as arrayref with 
xdata => \@xarray,
ydata => \@yarray,

[download]
I want to plot the diagramms with a loop.
Where the data is coming from is different for the loop elements, so that I have to put it before into a structure, over it then I can loop.
Not every index is filled. First I try to differ between and choose therefore i and ii, but then I dicide to use only the index i and skip the unfilled indexe during plotting.
This is the part of my code: 
# die Plotfelder/-hashe belegen und hash istart
$ii = -1;
for ($i = 0; $i <= $#yfeld; $i++) {
#   next if ($yfeld[$i] == 0);
   $ii = $ii + 1;
   print "$i $ii ";
   push(@ploty,$yfeld[$i]);
   push @{$istart{$ii}}, $istart[$i];
   push @{$ianz{$ii}}, $ianz[$i];
   if ($xfeld[$i] eq 'x') {
      push @{$plotx{$ii}}, @xfix;
      print "x\n";
   } elsif ($xfeld[$i] eq 'y') {
      push @{$plotx{$ii}}, @yfix;
      print "y\n";
   } else {
      push @{$plotx{$ii}}, $fnfeld[$xfeld[$i]]->{'fn'};
      print "$xfeld[$i]\n";
   }
}
print "\n";
print "2 $plotx{2}[3]\n";
print "3 $plotx{3}[3]\n";
print "5 $plotx{5}[3]\n"; # ?
print "6 $plotx{6}[3]\n";
print "7 $plotx{7}[3]\n"; # ?
print "8 $plotx{8}[3]\n"; # ?
print "9 $plotx{9}[3]\n";

[download]
The prints in the loop are for checking. It seems all correct. 
0 0 0
1 1 0
2 2 y
3 3 y
4 4 0
5 5 5
6 6 x
7 7 5
8 8 5
9 9 y

[download]
I ommit the index 0, 1, 4, because it is empty (0 in the first print-block).
But the print-check at the end of my code snippet gives this: 
2 3.640000E-04
3 3.640000E-04
Use of uninitialized value in concatenation (.) or string at test.pl l
+ine 590.
5 
6 3.640250E-04
Use of uninitialized value in concatenation (.) or string at test.pl l
+ine 592.
7 
Use of uninitialized value in concatenation (.) or string at test.pl l
+ine 593.
8 
9 3.640000E-04

[download]
So it means, that something goes wrong, where I want to assign the fnfeld to my plotx.
I read this "References quick reference" and my brain has meanwhile several knots to thinking about this. But I have no idea, what is wrong with the syntax.
I think, it is the reference, because I use it successfull for plotting: 
ydata => $fnfeld[$ploty[$ii]]->{'fn'},

[download]
But how can I assing the values from the array of hashes, which contains an array?

Regards, buchi

In reply to question to a complex structure of hash/array by buchi2

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