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Re: Re: max value in a hash

by liz (Monsignor)
on May 31, 2004 at 09:31 UTC ( [id://357757]=note: print w/replies, xml ) Need Help??


in reply to Re: max value in a hash
in thread max value in a hash

This approach will not give the correct result if all of the values are negative: 
my %hashName = (a => -1, b => -2, c => -3);
my $max = 0;
$_ > $max and $max = $_ for values %hashName;
print $max;
__END__
0   # expected -1

[download]
Of course, if you are sure that all values are positive numeric values, there is no problem. But it is something to keep in mind in general, I think.

Liz

Replies are listed 'Best First'.
Re:^3 max value in a hash
by Hena (Friar) on Jun 01, 2004 at 09:10 UTC
    And to add in general use of situations like this (for min and max) use 'each' first. Modified version from above. 
    my %hashName = (a => -1, b => -2, c => -3);
my $max = $hash{each %hashName};
$_ > $max and $max = $_ for values %hashName;
print $max;

    [download]
    And you'll the scalar set as one in the hash in the beginning.
[reply]
[d/l]

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