I agree with Raul about not optimizing in advance. I imagine I could fit a lot of tic-tac-toe boards into 16 GB RAM (with 60 GB SSD paging).
On Mon, Nov 19, 2012 at 1:37 PM, Peter B. Kessler < peter.b.kess...@oracle.com> wrote: > Alex Giannakopoulos wrote: > >> On 17 November 2012 02:39, Raul Miller <rauldmil...@gmail.com> wrote: >> >> On Fri, Nov 16, 2012 at 11:53 AM, Alex Giannakopoulos >>> >>>> then cheap tricks like "padding" to read will have to be discarded, >>>> and something more serious adopted. (I mean, you're not going to >>>> pad a 3-d cube with 6 copies of itself, are you? LOL) >>>> >>> Why not? >>> >>> For contrast, in lisp, it's traditional to use lists which double the >>> storage needed to represent a list of numbers >>> [...etc] >>> >>> Also, on my phone, I've numerous applications I do not use and which I >>> cannot turn off which each occupy about 8MB. In contrast, six copies >>> of a 3D tic-tac-toe board is probably about 1k of memory... >>> >>> >> That's an interesting perspective Raul, thanks. >> However, my concern was not the saving of 1k mem, but a deeper elegance >> issue. I may be wrong here, I don't know, but I always prefer my data to >> exist as only one copy, and as many references to it as are needed. >> > > The perfect opportunity to (re)read > > Compilation and delayed evaluation in APL > Leo J. Guibas, Douglas K. Wyatt > POPL '78 > Proceedings of the 5th ACM SIGACT-SIGPLAN symposium on Principles of > Programming Languages > Pages 1-8 > 1978 > > http://dl.acm.org/citation.**cfm?id=512761<http://dl.acm.org/citation.cfm?id=512761> > > for the idea of delaying evaluation of data accessors. You could have > several views with different transformations onto the same data, without > having to have several copies of the data. As a J programmer you shouldn't > have to think like that, as long as the implementors of J think like that. > > ... peter > > > And while a 3D tic-tac-toe is not that taxing on memory, the same can't be >> said of 10k x 10k x 10k cellular automaton. >> >> Anyway, I'll see how it goes once I write it. Thanks for all your help. >> ------------------------------**------------------------------** >> ---------- >> For information about J forums see >> http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm> >> > ------------------------------**------------------------------**---------- > For information about J forums see > http://www.jsoftware.com/**forums.htm<http://www.jsoftware.com/forums.htm> > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
