\. is faster than \ so use scan =. 1 : '}.@(u~/\.&.|.)'
Henry Rich > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Brand > Sent: Friday, September 26, 2008 2:33 PM > To: Programming forum > Subject: Re: [Jprogramming] scan operator > > Thanks for the pointers, here it is: > scan =. 1 : '}.@: (((u~/)&.|.)\)' > - scan >: i.5 > _1 _4 _8 _13 > (1-2),((1-2)-3),(((1-2)-3)-4),((((1-2)-3)-4)-5) > _1 _4 _8 _13 > > Does this seem like something there ought to be a primitive > for, I think > that q might have one? Anyway, it looks like it works so far. > I want to use > it to do exponentially weighted moving average EWMA, which > was a topic on > the forum earlier in the year. > > Cheers, > Matthew. > > On Fri, Sep 26, 2008 at 5:07 PM, Devon McCormick > <[EMAIL PROTECTED]> wrote: > > > Hi Matthew - maybe this is what you want: > > > > (1-2)-3 > > _4 > > -~/|.1 2 3 > > _4 > > ((1-2)-3)-4 > > _8 > > -~/|.1 2 3 4 > > _8 > > > > so, you could do "f~/|." > > > > On Fri, Sep 26, 2008 at 11:44 AM, Matthew Brand > <[EMAIL PROTECTED] > > >wrote: > > > > > Hi All, > > > > > > If I have a dyadic function f, how can I do the following: > > > > > > (((y0 f y1) f y2) f y3... ) f yn > > > > > > I want to feed the result of x f y into the next > evaluation as the left > > > parameter. > > > > > > > > > Thanks, > > > Matthew. > > > > ---------------------------------------------------------------------- > > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > > > > > > > > > -- > > Devon McCormick, CFA > > ^me^ at acm. > > org is my > > preferred e-mail > > > ---------------------------------------------------------------------- > > 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
