use List::Util qw(min);
$hash{$set}{min} = min @{$hash{$set}{data}};

[download]
I love that module. Thank goodness it's in the core since 5.8. Of course that doesn't address your beef, but in this case I think you're looking for aliasing, not a condensed form of the ternary. Some of that is available with Perl5 already, had you phrased your loop differently: 
for (@{$hash{$set}{data}}) {
    $hash{$set}{min} = $hash{$set}{min} < $_
        ? $hash{$set}{min}
        : $_;
}

[download]
And in Perl6 (I'm probably getting the syntax wrong) it'd be something like: 
my $min := $hash{$set}{min};
for(@{%hash{$set}{data}}) { $min = $min < $_ ? $min : $_ }

[download]

Makeshifts last the longest.

In reply to Re^3: A set of new operators. In keeping with the design of Perl? (aliasing) by Aristotle
in thread A set of new operators. In keeping with the design of Perl? by BrowserUk

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.