[Jprogramming] sin is odd

[Roger Hui]

I prefer the following formulation:

   (^&j. -: cos j. sin) 0.5*i.4
1

j. is one of those masterstrokes that separate genius from mere mortals.



On Wed, Sep 11, 2013 at 10:18 AM, km <km at math.uh.edu> wrote:

>     sin =: 1&o.
>     cos =: 2&o.
>     i =: 0j1
>     (^&j. -: cos + i * sin) 0.5*i.4
>  1
>
> Kip
>
> Sent from my iPad
>
>
> On Sep 11, 2013, at 11:42 AM, Raul Miller <rauldmiller at gmail.com> wrote:
>
> >   ^&j. ..- 0.5*i.4
> > 1 0.877583 0.540302 0.0707372
> >   2 o. 0.5*i.4
> > 1 0.877583 0.540302 0.0707372
> >   1 o. 0.5*i.4
> > 0 0.479426 0.841471 0.997495
> >   ^&.j. .:- 0.5*i.4
> > 0 0.479426 0.841471 0.997495
> >
> > --
> > Raul
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>