XP is just a number | |
PerlMonks |
How Perl6 treating decimals as rationals helped me solve a problemby grondilu (Friar) |
on Nov 16, 2012 at 00:04 UTC ( [id://1004081]=perlmeditation: print w/replies, xml ) | Need Help?? |
Hi monks, I was about to solve this rosalind.info problem using perl5, but while I was writing I realized there were at least two features in Perl6 that could be usefull if I want to spare a few lines of code. So I wrote my solution in Perl6, and it passed on first try. Execution took a bit of time (about a minute or so) but it was well in the five minutes delay so that was fine. It was pretty easy. About ten lines of code. On rosalind, once you solved a problem you can join a discussion thread where you can post your solution and see other people's ones, with comments. So I did that as I do usually. And then I was intrigued because most people were complaining about how this problem was a pain in the xxx because of the floating point approximations. At first I did not understand. But then, thinking about it, I realised that this problem indeed requires computing a lot of differences between decimal numbers and then comparing those differences. It sure is the kind of things that creates issues when using floating point numbers. Yet I had totally failed to notice that this problem could occur. So how was it possible that my code worked? Well, I then remember that Perl6 treats decimals as rationals, not floating points, and I guessed this was the answer. I also remember that I once wondered if that was not a bit of a luxury to do that in Perl6. But now I'm totally convinced it is a good idea. A decimal should really be treated as a rational, unless explicitly casted otherwise. I won't say that's the first time Perl6 impresses me. But hey, kind of.
Back to
Meditations
|
|