Parser Bug Somewhere.... (PR#460)

Full_Name: John P Cavanaugh
Version: .99
OS: linux
Submission from: (NULL) (24.116.10.99)


dataset$ema12 <- EMA (dataset$Close,12)
dataset$ema26 <- EMA (dataset$Close,26)
dataset$MACD_fast <- dataset$ema26 - dataset$ema12
dataset$MACD_slow <- EMA(dataset$MACD_fast,9)

dataset$MACD_hist <- dataset$MACD_fast - dataset$MACD_slow  # This line doesnt
work!!!


But... if I does work if I do the following

dataset$MACDfast <- dataset$ema26 - dataset$ema12
dataset$MACDslow <- EMA(dataset$MACDfast,9)
dataset$MACDhist <- dataset$MACDfast - dataset$MACDslow

Something seems wrong if you have an underscore in the dataname.  I think
this is a valid name and shouldnt need to be escaped inside of "". 

No, it's not a valid name. The underscore is a synonym for the assignment
operator <-, and so needs to be quoted if you use it. 

If you think this is horrible you're quite right, but the S language
allows _ for <- and many people are used to it.

The commonest S usage is MACD.fast, though some people use capital letters
for embedded words -- MACDFast. Both are used in the base R package:
as.vector(), getOption().


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._