> How do you generate normally distributed random numbers? ... Here's what I use. normalrand =: [: +/ [: (? - ?) 0 $~ 6 , ] R =: normalrand 100 NB. 100-vec of Gaussian noise: mean 0, sd 1
Note that ?0 has variance %12. So +/(?-?)6$0 has mean zero and variance one, and is practically normally distributed. (The probability that a standard normal variable U satisfies U>12 is small). - Bo >________________________________ > Fra: Ian Clark <[email protected]> >Til: [email protected] >Sendt: 0:55 torsdag den 9. august 2012 >Emne: Re: [Jprogramming] Miscellaneous J Questions > >> How do you generate normally distributed random numbers? ... > >Here's what I use. > >require 'stats/base/random' >R=: normalrand 100 NB. 100-vec of Gaussian noise: mean 0, sd 1 > >> Also, does anyone know how to make the J dictionary work on a mac? My >> computer opens it with gedit for some reason and won't compile it. > >Don't understand this... > >When I choose Help > Dictionary in j602 on my iMac, the browser >launches and shows: >file:///Applications/j602/help/dictionary/contents.htm > >Have you got some preferred editor setup in your default browser? > >Why not use the web version for now (I do all the time): >http://www.jsoftware.com/help/dictionary/contents.htm > >On Wed, Aug 8, 2012 at 11:37 PM, Owen Marschall ><[email protected]> wrote: >> Hi everyone, >> >> Quick question: >> How do you generate normally distributed random numbers? I remember one of >> the labs showed me how, but I've tried every possible combination of >> abbreviations of "normal" and "random," yet nothing's working. I'm guessing >> the lab must have loaded some package I forgot about. What package is this? >> I've looked through the labs and can't find it. >> >> Also, does anyone know how to make the J dictionary work on a mac? My >> computer opens it with gedit for some reason and won't compile it. >> >> Thanks, >> Owen >> ---------------------------------------------------------------------- >> 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
