[R] Printing a single "\" character
Duncan Murdoch
murdoch at stats.uwo.ca
Tue Apr 19 18:08:46 CEST 2005
Firas Swidan wrote:
> Hi,
> I have a small R question: how to print a single "\" character? I have the
> following results:
>
>>print("\") does not work
>
>
>>print("\\")
>
> [1] "\\"
You can use the lower level function cat() to print exactly what you want:
> cat("\\")
\>
Notice that not even a newline was printed after the backslash, so the
prompt showed up on the same line. To get what you were hoping for you
could use
> cat("[1] \"\\\"\n")
[1] "\"
but it's pretty hard to read, because of all the escapes.
>
> I need to make the following substitution as well, but it does not work
> either:
>
>>sub("_","\_","g_g")
>
> [1] "g_g"
I'm not sure what you want to get, but it might be
> cat( sub("_", "\\\\_", "g_g") ); cat("\n")
g\_g
The extra escapes are necessary because you need to send \\ to sub so
that it outputs a \.
Duncan Murdoch
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