The program does not crash or hang on my system. Latest J64 on Ubuntu.
2009/6/16 Cliff Reiter <[email protected]>: > Hi, > In trying to create a circularly symmetric sinc 2-d function > I have run into a surprising, difficult to isolate crash. > It seems that the array can be created but crashes occur > if the "v" below is used after the creation line in the examples > below. It has never crashed for me with size "15", sometimes does > for "16", and seems to consistently crash for "200". > Is this a known bug or problem with my system (windows xp64 running > 32 bit J6.02; J64 seems to hang rather than crash)? BTW, "plot" > has nothing to do with the problem as far as I know, but it > illustrates how simple and non threatening the data is. > Best, Cliff > > load 'plot' > sinc=:(sin%])`1:@.(=&0)"0 > x=:0.1*i:200 > g=:+&.:*:"0 > y=:g/~ 0.1*i:200 > 'density' plot y > 2 2{.v=:sinc y=:g/~ 0.1*i:15 > >./,y > >./,v NB. OK > 'density' plot v > 2 2{.v=:sinc y=:g/~ i:16 > >./,y > >./,v NB. usually crashes > 2 2{.v=:sinc y=:g/~ 0.1*i:200 > >./2 2{.v NB. crashes when v is used > > > -- > Clifford A. Reiter > Mathematics Department, Lafayette College > Easton, PA 18042 USA, 610-330-5277 > http://www.lafayette.edu/~reiterc > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
