How to execute a funcition which name is stored in a string?
On Nov 1, 2009, at 11:07 PM, Ning Ma wrote:
Hi, everybody Is there any way to execute a function, which name is stored in a string. such as: a <- "ls()" foo(a) ## same as ls() itself.
Need to leave the "()" off. > fstr <- "sum" > eval(parse(text=fstr))(1:5) [1] 15
Or, to execute a R command, which is stored in a string such as: a <- "m1 <- matrix(1:9,3,3)" foo(a) ## same as the assignment itself
> eval(parse(text="m1 <- matrix(1:9,3,3)"))
> m1
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
David Winsemius, MD Heritage Laboratories West Hartford, CT