Re: [R] help with as.function

From: Gabor Grothendieck <ggrothendieck_at_myway.com>
Date: Wed 14 Jul 2004 - 15:25:45 EST

 <solares <at> unsl.edu.ar> writes:

>
> HI, sorry but i don't understand how to make a function with as.function()
>
> formula<-"2+3*x"
> formu<-as.symbol(formula)
> > formu
> 2+3*x
> formul<-as.function(alist(x=,formu))
> curve(formul,1,5,col="blue")
> Error in xy.coords(x, y, xlabel, ylabel, log) :
> x and y lengths differ
> > typeof(formul)
> [1] "closure"
>
> and not plot the curve function, Why? Thanks Ruben

Here are two ways to create a function out of strings although neither uses as.function:

f <- function(x){}
body(f) <- parse(text="2+3*x")

f <- eval(parse(text=paste("function(x)","2+3*x")))



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