function - access column
Thanks! It helps. I completely forgot about the colnames function I added a "which(colnames(m)==n)" to my own function and now I can access with no problem the column by the number instead of the name. On Fri, Oct 7, 2011 at 5:09 PM, R. Michael Weylandt
<michael.weylandt at gmail.com> <michael.weylandt at gmail.com> wrote:
Perhaps something like this:
Test <- function(m){
? ? m <- if(is.character(m)) get(m) else m
? ? stopifnot(length(colnames(m))>0)
? ? n = colnames(m)
? ? # Process n however
? ? 2* m[, n]
}
That make sense?
Hope it helps,
Michael
On Oct 7, 2011, at 11:03 AM, Ana <rrasterr at gmail.com> wrote:
How can I call matrix$col, inside a function?
The matrix name is one of the variables of the function, while the
column name I get by assuming that it should have a certain
characters.
something like this
function(matrix){
colname=as.name(grep("[A-T a-t]ting",colnames(matrix),value=TRUE))
output=2*(matrix$colname)
return(output)
}
The name of the column is Testing.
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