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
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