There is site that does this. But I believe Rosetta Code is in a different spirit. Optimizing code for performance is tricky. if you dig deep enough its _always_ about knowing the way the cpu works, regardless of what language you start with you will always have to keep digging into the language the interpreter is written in or how the compiler works or how the virtual machine works. A good J programmer could implement an algorithm more efficiently than a bad assembly programmer. But a good assembly programmer will _always_ be able to implement the same algorithm more effeciently than a J programmer.
But J programmers don't care. It will take us a fraction of the time to program it and be able to describe the code in high level human or symbolic language better. And that's where there is room for evangelism in Rosetta Code. We can say look how easy this is to express if you are expressing it in the right language. I recall seeing, somewhere on this mailing list, Roger express efficiency of an algorithm as a function of the time it takes run _and_ the time it takes to code. http://shootout.alioth.debian.org/ I admire the fact that they admit the benchmarks are flawed. For some algorithms the leaders can change quite often, and it depends heavily on the cpu. Basically because of what I mentioned above. Optimizing code is a never ending story. Optimizing while also making it easier to understand is the real trick. Sent via BlackBerry by AT&T -----Original Message----- From: Matthew Brand <[email protected]> Date: Mon, 12 Oct 2009 22:36:58 To: Chat forum<[email protected]> Subject: Re: [Jchat] [Jprogramming] Limit limitation WRT evangelism. Would it be worthwhile to show a comparison of the time to execute the given C++ (or Python) algorithm on a selected example and the time to execute the given algorithm in J? For example, nth_root takes 300 times as long as %: on my computer. I wonder how long they take compared to the Python program? It would be good on the Rosetta code site if there was a table of execution time comparisons for each language on the same machine. I would like to see J vs Python vs C++ in particular. I could not work out how to time a program in Python though, and do not know how accurate the Ts function from load 'system\packages\misc\jforc.ijs' is. I.e., I do not know enough about Python or Ts to fairly publish a time comparison, but think it would be useful. The question is, is J faster than Python when the best J programmers write J vs the best Python programmers writing Python? What about C++? 2009/10/12 Dan Bron <[email protected]> > I wrote: > > To that end, I've created a page on RC to start that dicussion: > > http://rosettacode.org/wiki//HouseStyle . > > The link should've been http://rosettacode.org/wiki/J/HouseStyle . > > -Dan > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
