Hi All-
I have noticed a curious phenomenon since upgrading to R 2.15.2. I can't even
consistently replicate the problem, but I will describe it as best as possible.
I get "ghost text" in my R console echoing the names of variables that I am
returning from functions. This occurs even when I am not calling the function
but is observed simply after loading the functions into my workspace via
source(....). Suppose I have a file "myFunctions.R", with a function like this:
myFunction <- function(){
obj <- doSomething()
class(obj) <- 'SomeClass'
return(obj)
}
Upon sourcing the file (with source(...)), and sometimes upon executing the
function itself, I sometimes (but not consistently) observe background gray
text in console like this:
>source('myFunctions.R')
obj >
where "obj" is printed in gray (but this color is presumably dependent on R
preferences...in any event, it is clearly distinct from font colors associated
with printed return values, command line input, and error/warning messages).
And sometimes when I execute the function (in a simulation or otherwise), I can
get long streams of this that appear to be echoing the local (within-function)
name of the returned variable, e.g.:
> source('mySimulationScript.R') # run a script file that iteratively calls
> myFunction(..)
obj
obj
obj
obj
obj
obj
obj
obj
obj
obj > ## the next R prompt: note displacement to right of phantom "obj" text
This looks identical to the screen text you can observe in an R console when
running system commands with system(...), e.g., echoing terminal output to R
console.
Again, I can't even consistently replicate this. But I only observe the issue
with R 2.15.2 (running the same code on R 2.15.1 does not lead to this
behavior). I'm running R 2.15.2 on OSX 10.7.5:
> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_2.15.2
~Dan Rabosky
_____________________
Dan Rabosky
Assistant Professor
Dept of Ecology and Evolutionary Biology
& Museum of Zoology
University of Michigan
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