Why do you think that? Or were you referring to Xiao-Yong Jin's narrative?
Thanks, -- Raul On Mon, Jul 10, 2017 at 5:17 PM, Devon McCormick <devon...@gmail.com> wrote: > So, you start with $10,000 (=100*$100) but end up with $2,025 (=45*$45), > how? > > On Mon, Jul 10, 2017 at 3:59 PM, Raul Miller <rauldmil...@gmail.com> wrote: > >> I don't really understand what you mean by "mean expectations" - could >> you describe the intent there? >> >> That said, here's how far I've gotten in implementing this concept: >> >> tick=: (0 >. <:) + i.@# +/@:(=/)~ +/@:* ?@# # >> (mean,stddev)"1 tick^:(i.10)]100#100 >> 100 0 >> 100 0.932034 >> 100 1.41421 >> 100 1.91749 >> 100 2.07437 >> 100 2.34844 >> 100 2.48633 >> 100 2.71546 >> 100 2.97803 >> 100 3.26289 >> >> (Also, for animation in J, there's actually a lot of options... >> basically though you set up a paint event which calls into your >> rendering code and then trigger updates from systimer.) >> >> Thanks, >> >> -- >> Raul >> >> On Mon, Jul 10, 2017 at 3:43 PM, Xiao-Yong Jin <jinxiaoy...@gmail.com> >> wrote: >> > I thought this is a good lunch break exercise. >> > >> > http://www.decisionsciencenews.com/2017/06/19/counterintuitive- >> problem-everyone-room-keeps-giving-dollars-random-others- >> youll-never-guess-happens-next/ >> > >> > Quote: “Imagine a room full of 100 people with 100 dollars each. With >> every tick of the clock, every person with money gives a dollar to one >> randomly chosen other person. After some time progresses, how will the >> money be distributed?” >> > >> > And I came up with this simulation. (45 people with 45 dollars each, >> same as on the webpage.) >> > >> > /:~@(-&1`]@.(=&0)"0 (#/.~@] + ~.@]{[)`(~.@])`[} >&0 # (?@#~@#@]`]`[} >> ]I.@:=i.@#)^:_@?@#~@#)^:5000 #~45 >> > >> > And I really like to see the mean expectations and the standard >> deviation of the mean, I ended up doing this. (Make sure the J sentence is >> one long line if you want to try it out.) >> > >> > ((],.[:(+/%#*<:@#)&.:*: -"1)+/%#)}.(/:~@(-&1`]@.(=&0)"0 (#/.~@] + >> ~.@]{[)`(~.@])`[} >&0 # (?@#~@#@]`]`[} ]I.@:=i.@#)^:_@?@#~@#)^:10000)^:(<65) >> #~45 >> > 0.984375 0.124984 >> > 2.01562 0.170335 >> > 3.0625 0.180765 >> > 4.15625 0.230616 >> > 5.21875 0.248476 >> > 6.1875 0.306894 >> > 7.35938 0.332862 >> > 8.64062 0.362809 >> > 9.84375 0.380723 >> > 10.9688 0.383805 >> > 12.125 0.407944 >> > 13.6406 0.423964 >> > 15.0625 0.457453 >> > 16.5312 0.462893 >> > 18.1875 0.480717 >> > 19.7031 0.464877 >> > 21.1562 0.475709 >> > 22.7031 0.483702 >> > 24.4062 0.516935 >> > 26.4062 0.5768 >> > 28.1094 0.604266 >> > 29.8281 0.617838 >> > 31.875 0.61942 >> > 33.9375 0.603345 >> > 35.7812 0.642211 >> > 37.9844 0.647987 >> > 40.6562 0.731321 >> > 43 0.739342 >> > 45.3906 0.723616 >> > 48.0469 0.7613 >> > 51.6094 0.823639 >> > 54.7656 0.873934 >> > 57.1406 0.815544 >> > 60 0.866598 >> > 63.8594 0.898319 >> > 68.75 0.918018 >> > 73.5781 1.00736 >> > 78.3281 1.08128 >> > 84.9688 1.25534 >> > 93.4688 1.29731 >> > 104.578 1.73274 >> > 114.922 2.07574 >> > 131.938 2.7357 >> > 159.359 4.40899 >> > 204.766 7.24239 >> > >> > So, how do I make a fancy animation (like the one in the webpage I >> linked in the beginning of this message) with J? >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > > -- > > Devon McCormick, CFA > > Quantitative Consultant > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
