Hi,
On Thu, Aug 22, 2013 at 9:49 PM, Jeff Newmiller
wrote:
> Please don't post in HTML format... it messes with code examples.
>
> Use character indexing (please read the Introduction to R... again if
> necessary).
>
> myf <- function(df, colname){
> df[ ,colname ]
> }
Or df[[colname]] for da
Please don't post in HTML format... it messes with code examples.
Use character indexing (please read the Introduction to R... again if
necessary).
myf <- function(df, colname){
df[ ,colname ]
}
colname <- "a"
myf(m,colname)
Until you learn simple R syntax, I strongly recommend avoiding wri
m=as.data.frame(outer(1:5,6:9))
colnames(m)=c('a','b','c','d')
tf=function(df, col){list(mean(eval(substitute(col),df,parent.frame())),col
)}
tf(m,a) will issue error: Error in tf(m, a) : object 'a' not found
How can I replace the col as char 'a' in the function?
Thank you
[[alternat
for example I have data frame m as below:
m=as.data.frame(outer(1:5,6:9))
colnames(m)=c('a','b','c','d')
and I define the function
myf=function(df, colname){
suppose colname is a, then:
how can I get the column 'a'
and how to get the colname as a string, 'a'
}
Thank you!
[[a
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