Repression is in the eye of the beholder? I can point out any number of things about python that trouble me, I am not sure that that would accomplish anything useful but we can do that in private (or on the chat forum) if you feel like it.
Meanwhile, reduce works well with the design of J. Thanks, -- Raul On Sat, Feb 15, 2014 at 3:02 PM, David Lambert <[email protected]>wrote: > Python isn't quite so bad. > >>> sum((x + 2.91) / 0.4 for x in range(10)) # python > 185.25000000000003 > >>> > > I find the sum function somewhat "windows" like in that some common > operations are especially easy. The reduce function was demoted from > builtin to a library in python3. Why work under these repressive > constraints? > > +/ 0.4 %~ 2.91 + i. 10 NB. j > 185.25 > > Let's remember gawk: > > $ gawk 'BEGIN{for(x=0;x<10;++x)a+=(x + 2.91) / 0.4;print a;exit}' > 185.25 > > >Date: Sat, 15 Feb 2014 12:04:13 -0500 > >From: Lee Fallat <[email protected]> > >To: [email protected] > >Subject: Re: [Jprogramming] awk-like J sentences? > > > >Message-ID: > > <cakzhxzhxcyhdzzccvgvgaftzqxxgvmqwzstfholfu0m4g+a...@mail.gmail.com> > >Content-Type: text/plain; charset=UTF-8 > > > >Thanks for the explanation Raul. > > > >I think I understand now that string manipulation in J is > >non-trivial...I was following right up until the very last J sentence > >( 'hi',:&.(-&(a.i.'*'))&.(a.&i.)'there'), mostly because I still only > >know a few verbs. I am starting to think J is either not for me, or my > >way of thinking really needs to change for this language. There are so > >many things that would seem straight forward in traditional languages > >than J, but I will have to see! > > > >Some examples of what I'm thinking of would be difficult or different in > J: > >Passing 3 or more parameters to a verb > >Turning a vector into a list of arguments > >...loops? From what I've seen loops are built into some verbs (+/ -/ > >etc), but what if you wanted to do say: add every number in the > >vector, but for every number add 2.91, then divide that by 0.4? > >In python: > >range() generates a list of numbers from 0 to 9. > >for x in range(0,10) > > y += (x + 2.91) / 0.4 > >One other thing is interacting with the operating system...How do I > >check to see if files, or even directories exist? Can you create > >directories, or change permissions of files with J? The scope of J > >seems to be very constrained to mathematics. It would be nice to use J > >as a system programming language! Are there any examples of people > >doing these things? > > > >Anyways, I apologize for being off-topic, but just some things I've > >been thinking about. Like I said I still have to get through some more > >learning material. > > > >Regards, > > > >Lee > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
