Ah, thanks, I see.
And also the point of f. .

 
> During the execution of twice, the value func is set to is 'func'; hence the
> stack error.  You could use
> 
> func =. u f.
> 
> Henry Rich
> 
> On 4/13/2011 5:18 AM, Ben Gorte - LR wrote:
> > Dear J programmers,
> >
> > A small adverb:
> >
> >     twice =: 1 : 0
> > func =. u
> > func func y
> > )
> >
> > The local assignment to func does not make much sense, but the question
> is: is it allowed? Well, it seems so:
> >
> >     *: twice i.5
> > 0 1 16 81 256
> >
> > but I should not give it a function with the same name as my local one:
> >
> >     func =: *:
> >     func twice 3
> > |stack error: func
> > |   func     func y
> >
> > I expected this to be okay. Why isn't it?
> >
> > Ben
> > ----------------------------------------------------------------------
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> http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
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