Raul, thanks for the simplifications. I'had the idea to try power ^: for Julia but it seems to add complexity. I'll get the book. Jan.
On Fri, Aug 12, 2011 at 3:48 PM, Raul Miller <[email protected]> wrote: > P.S. here are a couple transformations of the raw code, aimed at simplifying > it: > > First, remove the dependence on the global DIM: > > > julia=:1 : 0 > : > scale=.1.5 > jx=.scale*((-:m)-x)%-:m > jy=.scale*((-:m)-y)%-:m > c=._0.8j0.156 > a=.jx j. jy > i=.0 > while. i < 256 do. > a=.(a * a) + c > if. 1000 < | a do. i return. end. > i=.i + 1 > end. > 255 > ) > > > This changes the invocation line to > viewmat (i.DIM) DIM julia"0 0/ (i.DIM) > > Second, simplify the loop setup: > julia=:1 : 0 > : > scale=.1.5 > c=._0.8j0.156 > a=. scale*1j1 - 2 * (x j. y)%m > i.255 > for_i.i.255 do. > a=.(a * a) + c > if. 1000 < | a do. i return. end. > end. > 255 > ) > > That said, I highly recommend Cliff Reiter's book. > > That said, note that the link I sent in my previous message had a url > that ended in a period. But my mail client decided that that period > was not a part of the url, which means the url did not function > properly for me. > > Anyways, the name of the book is: Fractals, Visualization & J > > And here are a few urls for the book, which I am hoping will not be mangled: > > http://www.lulu.com/content/635966 > http://www.lulu.com/content/635938 > http://www.amazon.com/Fractals-Visualization-J-Clifford-Reiter/dp/1895721180 > http://www.amazon.com/gp/product/1430319801/ref=pd_lpo_k2_dp_sr_1 > > FYI, > > -- > Raul > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Jan Jacobs Esdoornstraat 33 5995AN Kessel W: www.sommaps.com T: +31 77 462 1887 M: +31 6 23 82 55 21 E: [email protected] ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
