David -
I think what you're looking for is something like this:
mydat = data.frame(a=c(1,2,3),b=c(5,1,4))
consolidate.fun = function(data,var1,var2,saved.max){
+ data$saved.max = apply(data[,c(var1,var2)],1,max)
+ data[,var1] = NULL
+ data[,var2] = NULL
+ data
+ }
mydat = consolidate.fun(mydat,'a','b','var.max')
mydat
saved.max
1 5
2 6
3 3
(I changed the name of the data frame, because c is a function
name, and using it as a data frame name causes confusiion.)
The "<<-" operator only operates on complete objects, not
columns within a data frame.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Thu, 18 Mar 2010, David Young wrote:
Dear List,
I'm getting the error: object of type 'closure' is not subsettable
And am not sure how to get around the problem. I've included two
short code sets below. One that shows what I want to do and works,
but without using the function much, and another that tries to use the
function but causes the error.
# THIS WORKS AND SHOWS WHAT I'D LIKE TO DO
a <- c(1,2,3)
b <- c(5,6,0)
c <- data.frame(a,b)
# TAKES THE MAX OF TWO VARS AND SAVES IT TO A NEW VARIABLE AND DELETES OLD
VARIABLES
consolidate.fun <- function( data, var1, var2, saved.max ) {
max <- apply( data[,c(var1, var2)], 1, max)
# THIS WORKS BUT I HAVE TO CALL THE DATA FRAME BY NAME RATHER THEN USING THE
FUNCTION DATA NAME
c[,"var.max"] <<- max
c$a <<- NULL
c$b <<- NULL
}
consolidate.fun( data=c , var1="a", var2="b", saved.max="var.max" )
c
# THIS SHOWS THE MORE COMPLETE USE OF THE FUNCTION'S INTENT, BUT
# CAUSES THE ERROR IN R.
a <- c(1,2,3)
b <- c(5,6,0)
c <- data.frame(a,b)
# TAKES THE MAX OF TWO VARS AND SAVES IT TO A NEW VARIABLE AND DELETES OLD
VARIABLES
consolidate.fun <- function( data, var1, var2, saved.max ) {
max <- apply( data[,c(var1, var2)], 1, max)
# SOURCE OF ERROR. I'VE TRIED CALLING THE DATA FRAME IN DIFFERENT
# WAYS, BUT NONE SEEM TO WORK FOR ME.
data[, saved.max ] <<- max
data[, var1 ] <<- NULL
data[, var2 ] <<- NULL
}
consolidate.fun( data=c , var1="a", var2="b", saved.max="var.max" )
c
Any helpful comments would be appreciated.
mailto:dyo...@telefonica.net
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
