On 27 Sep 2006 10:57:15 +0200, Peter Dalgaard <[EMAIL PROTECTED]> wrote:
> Tong Wang <[EMAIL PROTECTED]> writes:
>
> > Hi,
> > I am writing a function and need to pass a function expression as an
> > argument, for instance,
> > myfun <- function( express) {
> > x<- c(1,2,3)
> > y<-express
> > }
> >
> > if I call the above function by myfun( x*2 ), I get 2 as the result,
> > instead of 2,4,6 , could someone help me to
> > fix this problem ?
> > Furthermore, is that possible to operate this expression on different
> > variables? for example, in myfun(), I
> > might want to get u*2, z*2, etc. without having to say x<-u, x<-z to
> > match the expression.
> >
> > Thanks a lot for your help.
>
> Either pass the expression explicitly using myfun(quote(x*2)) or
> myfun(expression(x*2)) or use substitute(express) inside the function.
>
Regarding the second option see the source of curve by entering:
curve
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