Dear Raul and Henry thank you for your comprehensive list of ideas and explanation. It helped.

Ruda March 20, 2020 11:22 PM, "Raul Miller" <rauldmil...@gmail.com> wrote: > There are several ways to accomplish what I think you're asking for: > > Algebraic simplification: > g=:3 :0 > -y > ) > > Pass the intermediate result as a parameter: > > g=:3 :0 > b=. 2*y > f=. 4 :'y-x' > b f y > ) > > Or > > g=:3 :0 > b=. 2*y > f=. b 1 :'y-m' > f y > ) > > Serialize the desired value and incorporate it in the definition of f > > g=:3 :0 > b=. 2*y > f=. 3 :('y-',5!:5<'b') > f y > ) > > Define f tacitly: > > g=:3 :0 > b=. 2*y > f=. ] - b"_ > f y > ) > > If you want 'b' to be incorporated dynamically (so that updates > propagate into f, then you should pass it as a parameter or pull a > stunt like this: > > g=:3 :0 > b=. 2*y > f=. ] - ".@'b' > f y > ) > > You could also use locales, which might be handy if things get > complex, but are way more complicated than this example seems to call > for. > > g=:3 :0 > loc=. cocreate'' > b__loc=. 2*y > f=. loc 1 :'y - b__m' > r=. f y > coerase loc > r > ) > > There's other ways, also -- mostly variations on parameter passing. > > I hope this helps, > > -- > Raul > > On Fri, Mar 20, 2020 at 5:59 PM Rudolf Sykora <rsyk...@disroot.org> wrote: > >> Dear list, >> >> although I seem to be able to define a function within another function, >> it seems that the inner function does not see private variables from the >> outer one. What is then the correct way to write something like >> >> g =: 3 : 0 >> b =. 2*y >> f =. 3 : 'y-b' >> f y >> ) >> >> g 2 >> >> and get -2 as a result? >> >> Here one can change b =. to b =: , but this makes b completely public, >> and that's not particularly nice... >> >> Thanks >> Ruda. >> ---------------------------------------------------------------------- >> 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