Thanks for the feedback, everyone! Next time I do one of these, I'll post the script before I film it.
I didn't know about (or remember?) the volutions article. I just threw the code together in a couple minutes, and thought it would make a fun video for J outsiders. On Tue, Sep 1, 2015 at 3:11 PM, 'Pascal Jasmin' via Programming < programm...@jsoftware.com> wrote: > I'm not sure if I came up with this or not, > > but a spiral that starts at 0, and initially turns right. The y argument > is the square shape of the resulting spiral, so it doesn't end at the top > right like yours. > > (,~ $ |.@/:@(+/\)@(_1&|.@(}:@(2: # >:@i.) # <:@+: $ _1: , ] , 1: , -))) 7 > > some of the neat properties of this, > squares of even numbers go diagonally up left from 0. > squares of odd numbers go diagonally down right from 1 > > That is a very cool video though. A version of q: that will not fail for > 0, > > viewmat (#@q: :: 0:)"0 (,~ $ |.@/:@(+/\)@(_1&|.@(}:@(2: # >:@i.) # <:@+: $ > _1: , ] , 1: , -))) 15 > > ----- Original Message ----- > From: Michal Wallace <michal.wall...@gmail.com> > To: programm...@jsoftware.com > Cc: > Sent: Monday, August 31, 2015 11:09 PM > Subject: [Jprogramming] video: Ulam's Spiral > > Hey all, > > I made a 15 minute video about a line of J code I wrote a while back: > > https://www.youtube.com/watch?v=dBC5vnwf6Zw > > -Michal > ---------------------------------------------------------------------- > 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
