Comments on: isPrime in One Line of Perl http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/ They say if you have a 1000 monkeys at a 1000 keyboards, eventually they will produce the works of Shakespeare. This is what happens when you put 3Monkeys at one keyboard... Wed, 19 Nov 2008 23:29:53 +0000 http://wordpress.org/?v=2.6.2 By: Daniel Spiewak http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1721 Daniel Spiewak Wed, 18 Jul 2007 17:59:31 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1721 http://www.dzone.com/links/isprime_in_one_line_of_groovy.html http://www.dzone.com/links/isprime_in_one_line_of_groovy.html

]]> By: Mikhail Sayapin http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1719 Mikhail Sayapin Wed, 18 Jul 2007 06:18:08 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1719 Well, I see. The same "functionality" Python code is: not re.match('^1?$|^(11+?)\\1+$','1'*target_number) and is 38 chars. Prints "True" if the target_number is prime. However, it doesnt work with long integers and string integers. Definitely good way is to use SciPy library. Well, I see. The same “functionality” Python code is: not re.match(’^1?$|^(11+?)\\1+$’,'1′*target_number) and is 38 chars. Prints “True” if the target_number is prime. However, it doesnt work with long integers and string integers. Definitely good way is to use SciPy library.

]]> By: 3Monkeys http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1718 3Monkeys Tue, 17 Jul 2007 19:52:10 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1718 @Mikhail, that is why I added the "should be able to be replaced with any reasonable number" caveat in the "rules". You are correct though about perl being able to handle extremely large numbers. I was hoping for a python shot at it as it should be able to handle it. @Mikhail, that is why I added the “should be able to be replaced with any reasonable number” caveat in the “rules”. You are correct though about perl being able to handle extremely large numbers. I was hoping for a python shot at it as it should be able to handle it.

]]> By: Mikhail Sayapin http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1717 Mikhail Sayapin Tue, 17 Jul 2007 19:27:49 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1717 Unfortunately, the code doesn't work: perl -wle 'print(1)if(1x(2E+32582657-1))!~/^1?$|^(11+?)\1+$/' outs nothing. But 2E+32582657-1 IS prime. In fact it's the largest prime ever found. Well, 2E+32582657-1 is "inf" in Perl, but it's a fault of Perl, not us fellow programmers. Perl is just not suitable for this kind of tasks. Or prove us it is. Anyway, the idea and syntax are very, very cool. *bows* Unfortunately, the code doesn’t work: perl -wle ‘print(1)if(1x(2E+32582657-1))!~/^1?$|^(11+?)\1+$/’ outs nothing. But 2E+32582657-1 IS prime. In fact it’s the largest prime ever found. Well, 2E+32582657-1 is “inf” in Perl, but it’s a fault of Perl, not us fellow programmers. Perl is just not suitable for this kind of tasks. Or prove us it is. Anyway, the idea and syntax are very, very cool. *bows*

]]> By: 3Monkeys http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1715 3Monkeys Tue, 17 Jul 2007 17:20:33 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1715 @Bloid, I think that's where I first found this one. I have several of these tucked away for study. @Bloid, I think that’s where I first found this one. I have several of these tucked away for study.

]]> By: 3Monkeys http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1714 3Monkeys Tue, 17 Jul 2007 15:19:12 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1714 Finally got the ' correct :) It should work now as a copy/paste. Finally got the ' correct :) It should work now as a copy/paste.

]]> By: bloid http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1708 bloid Tue, 17 Jul 2007 08:32:37 +0000 http://3monkeyweb.com/3monkeys/2007/07/17/isprime-in-one-line-of-perl/#comment-1708 The quote at the end of your one line is the wrong type, copy-pasting it doesn't work (it's early and it took me a while to spot that) And for people who want to see how and why this works, have a look here: http://montreal.pm.org/tech/neil_kandalgaonkar.shtml The quote at the end of your one line is the wrong type, copy-pasting it doesn’t work (it’s early and it took me a while to spot that)

And for people who want to see how and why this works, have a look here:

http://montreal.pm.org/tech/neil_kandalgaonkar.shtml

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