[R] Generating the Ctrl-M character

[David Winsemius]

On Nov 10, 2011, at 11:55 PM, Jeff Newmiller wrote:

> Wow, Deadpan David.
>
> How about using the escape sequence "\r"?

So shoot me. It wasn't documented in a manner that I recognized in the  
places I looked.

?character
?Syntax
?Constants

And I did look at ?Quotes where "\r" is listed but did not know that  
it was == cntrl-M (if in fact it is.) I assumed (probably incorrectly)  
that ""\r" was cntrl-R. There was proabably a time in the past when I  
could have told you a lot of the decimal and maybe even hexadecimal  
equivalents for <cr>, <lf>, <beep>, but those days are behind me.

>
> Keep in mind that Ctrl-M is used as the end-of-line character on  
> some operating systems, so accomplishing this may not be portable,  
> and you didn't specify your operating system. On the three main  
> platforms (*nix, Windows/DOS, and Mac), "\r" should work, but "\n"  
> may get munged.

What? I very much doubt that any of those systems will not handle "\n"  
as expected. "\r" on the other hand I'm not so sure of.

-- 
David.


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> Sent from my phone. Please excuse my brevity.
>
> David Winsemius <dwinsemius at comcast.net> wrote:
>
>>
>> On Nov 10, 2011, at 9:35 PM, Ashim Kapoor wrote:
>>
>>> Dear R-helpers,
>>>
>>> I want to append a Ctrl-M character to a string and then save it to
>>> a text
>>> file.
>>>
>>> mystring<-"This is a test."
>>>
>>> # How do I add a Ctrl-M to it in the end ??
>>>
>>> cat(mystring,file="testfile")
>>>
>>
>>> cntrl_m <- intToUtf8(13)
>>
>>> cat(cntrl_m,file="testfile")
>>
>> The resulting file seems to have a "blank line" in my editor.
>>
>> -- 
>>
>> David Winsemius, MD
>> West Hartford, CT
>>
>> ______________________________________________
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>

David Winsemius, MD
West Hartford, CT