[R] by can not find transpose function

[David Winsemius]

> On Jun 20, 2017, at 7:19 AM, Sorkin, John <jsorkin at som.umaryland.edu> wrote:
> 
> I am trying to transpose a dataframe by its first column using the by statement using the t function. When I use the by function, I get a message,
> 
> Error in FUN(X[[i]], ...) : could not find function "FUN"
> 
> I don't think I have a syntax error in my by statement because the by statment works using the print function.
> 
> Data and an executable example follows:
> 
> phonydata2 <- structure(list(INTRVNTN = c("CONTROL", "CONTROL", "CONTROL",
> "MPR+NMES+HPRO", "CONTROL", "CONTROL", "CONTROL", "CONTROL",
> "MPR+NMES+HPRO", "MPR+NMES+HPRO", "CONTROL", "CONTROL", "CONTROL",
> "MPR+NMES+HPRO", "MPR+NMES+HPRO", "MPR+NMES+HPRO", "CONTROL",
> "MPR+NMES+HPRO", "MPR+NMES+HPRO", "CONTROL", "MPR+NMES+HPRO",
> "CONTROL", "CONTROL", "MPR+NMES+HPRO", "CONTROL", "CONTROL",
> "CONTROL", "MPR+NMES+HPRO", "CONTROL", "MPR+NMES+HPRO", "MPR+NMES+HPRO",
> "MPR+NMES+HPRO"), HGDOM1_MW1 = c(NA, NA, NA, NA, NA, NA, 17,
> 30, 27.5, 12, 16, 16, 14, NA, 33, NA, 12, 25, NA, NA, 6, NA,
> 13.5, 10, 1, NA, 12, 18, NA, NA, NA, NA), HGDOM1_W1 = c(8, NA,
> NA, 4, NA, NA, 18, NA, 26.5, 22, 14, 8, NA, NA, 33, NA, 15, NA,
> 4, 9, 18, NA, 14, 16, 2, NA, 18, 15, NA, NA, NA, NA)), .Names = c("INTRVNTN",
> "HGDOM1_MW1", "HGDOM1_W1"), class = "data.frame", row.names = c(NA,
> -32L))
> 
> phonydata2
> 
> # This works
> by(phonydata2[,2:3],phonydata2[,1],print)
> # This gives and error message.
> by(phonydata2[,2:3],phonydata2[,1],t)

It only gives an error message if you redefined `t`. It runs perfectly fine in there is no data-object in your workspace named `t`.


> 
> Thank you,
> John
> 
> 
> 
> 
> 
> 
> 
> 
> 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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> 
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David Winsemius
Alameda, CA, USA