[R] "displayed" output of cat(..., stderr()) is garbaged

[Vadim Ogranovich]

Dear R-users,

To display progress of a loop I wanted to print the current value of the
loop variable, e.g.

> for (i in 1:2) cat("i=", i, "\n")
for (i in 1:2) cat(i, "\n")
i= 1 
i= 2 


So far so good. Now I want to redirect it to stderr() (to make it
unbuffered)

> for (i in 1:2) cat("i=", i, "\n", stderr())
for (i in 1:2) cat("i=", i, "\n", stderr())
i= 1 
 2i= 2 
 2> 

This is contaminated with the value of the stderr file descriptor (2).

Is there any way to get rid of this "garbage"? Is there any other way to
write to stderr?

Thanks, Vadim

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