On Thursday 03 April 2003 08:53, Joseph Paish wrote:
> i have a hash that looks like this :
>
> abc => 123 456 789 246 346 8765
> deh => 123 456 258 246 346 8765
> nyx => 123 456 149 246 346 8765
> pob => 123 456 354 246 346 8765
> syt => 123 456 924 246 346 8765
>
> already sorted by the key (the first field above).
>
> i want to do some simple math based on the values of the third field.
>
> for example, replace the value of 789 in the first record above with 1578
> (twice it's value) or print out any hashes that have a value in the third
> field that is less than 500.
>
> this is easy enough to do with arrays, but i have so far been unsuccessful
> finding how to manipulate individual "elements" in hashes.
>
> suggestions?
>
> thanks
>
> joe
well, i figured out part of it shortly after posting the question. to access
individual "elements", i did the following :
foreach my $key (sort keys %last) {
# %last is the name of the hash ... now it is sorted by key
my @temp_array = split / /, $last{$key} ;
print $temp_array[2] ; # prints out the 3rd field
}
now, how to do math on it? in other words, i guess i am asking how to
convert a string '789' to a floating point number so i can do things like
multiply it.
thanks
joe
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