It looks like antirice's reply pinpoints your initial problem: you define 4 frame widgets --  @row[0..3] -- and your arrangement of values for $i is such that you appear to want 5 elements on each of the first three rows. But then you increment $r (row counter) after every third element (not every fifth one), which means $r will increment beyond 3.

As for your update about having a problem because you're assigning values like "*" and "." and "+" etc to $i -- that's a red herring. Those assignments are perfectly fine. Consider: 

#!/usr/bin/perl

@w = qw/a b + * \ x y = . - z/; 
print join(" : ", @w),$/;
for $i ( @w ) { $h{$i} = " okay\n" }
print join "", %h;

__OUTPUT__
a : b : + : * : \ : x : y : = : . : - : z
+ okay
a okay
- okay
z okay
* okay
x okay
= okay
\ okay
b okay
y okay
. okay

[download]
The "qw" operator even disarms the special meaning of backslash, and passes it through as a literal string.

In reply to Re: Undefined Button method?? by graff
in thread Undefined Button method?? by eoin

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.