[R] a little questions

[Ronaldo Reis Jr.]

Hi all,
I have some little questions.

1)
I make a function, with list's help, for make a map, its work OK, 
but it show an extra output of this:

    lapply(split(dataset,dataset$trajectory),lfun)

Is possible to eliminate any text output from an function?

2) 
I try to put an equation on a object to use in curve for example,
but it don't work, it possible to make a object of an equation?

ex.

fx <- a + b*x
for(a in 0){for(b in 1){curve(fx,...)}}

3)
Exist in R any functions to estimate severals curves (non interactive) for a 
dataset?
Something like table-curve 2d.

Thanks
Ronaldo
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