Rui,
I appreciate your suggestion, but eliminating the deparse statement does not
solve my problem. Do you have any other suggestions? See code below.
Thank you,
John
mydf <-
data.frame(id=c(1,2,3,4,5),sex=c("M","M","M","F","F"),age=c(20,34,43,32,21))
mydf
class(mydf)
myfun <- function(frame,var){
call <- match.call()
print(call)
indx <- match(c("frame","var"),names(call),nomatch=0)
print(indx)
if(indx[1]==0) stop("Function called without sufficient arguments!")
cat("I can get the name of the dataframe as a text string!\n")
#xx <- deparse(substitute(frame))
print(xx)
cat("I can get the name of the column as a text string!\n")
#yy <- deparse(substitute(var))
print(yy)
# This does not work.
print(frame[,var])
# This does not work.
print(frame[,"var"])
# This does not work.
col <- xx[,"yy"]
# Nor does this work.
col <- xx[,yy]
print(col)
}
myfun(mydf,age)
myfun()
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
Rui Barradas <ruipbarra...@sapo.pt> 12/05/16 10:17 AM >>>
Hello,
You don't need xx <- deparse(substitute(...)), since you are passing the
data.frame to your function. Just use
myfun <- function(frame,var){
[...]
# Nor does this work.
col <- frame[,yy]
print(col)
}
myfun(mydf,age)
myfun(frame = mydf, var = age)
[1] 2 3
I can get the name of the dataframe as a text string!
[1] "mydf"
I can get the name of the column as a text string!
[1] "age"
[1] 20 34 43 32 21
Hope this helps,
Rui Barradas
Em 05-12-2016 14:44, John Sorkin escreveu:
I am trying to write a function which, when passed the name of a dataframe and
the name of a column of the dataframe, will allow me to work on the columns of
a dataframe. I can not get my code to work. Please see the code below. Any help
in getting the function to work would be appreciated.
mydf <-
data.frame(id=c(1,2,3,4,5),sex=c("M","M","M","F","F"),age=c(20,34,43,32,21))
mydf
class(mydf)
myfun <- function(frame,var){
call <- match.call()
print(call)
indx <- match(c("frame","var"),names(call),nomatch=0)
print(indx)
if(indx[1]==0) stop("Function called without sufficient arguments!")
cat("I can get the name of the dataframe as a text string!\n")
xx <- deparse(substitute(frame))
print(xx)
cat("I can get the name of the column as a text string!\n")
yy <- deparse(substitute(var))
print(yy)
# This does not work.
col <- xx[,"yy"]
# Nor does this work.
col <- xx[,yy]
print(col)
}
myfun(mydf,age)
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric
Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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