[R] Obtain the hex code for a given character.

[Duncan Murdoch]

On 14-02-04 11:56 PM, David Winsemius wrote:
>
> On Feb 4, 2014, at 4:57 PM, Rolf Turner wrote:
>
>>
>>
>> If I have a character such as "£" stored in a object called "xxx", how can I obtain the hex code representation of this character?  In this case I know that the hex code is "\u00A3", but if I didn't, how would I find out?
>>
>> I would like a function "foo()" such that foo(xxx) would return, say, the string "00A3".
>>
>
> Close:
>
>> as.hexmode(utf8ToInt("£"))
> [1] "a3"

Nice one.  I have seen that function before, but I didn't remember it 
this time.  One part of the documentation makes it harder to find:  it 
talks about "UTF-8 code points", rather than "Unicode code points".
UTF-8 is the way the Unicode code point is encoded into bytes.

Duncan Murdoch




>
>> I have googled and otherwise searched around and have come up with nothing that seemed at all helpful to me.  If I am missing something obvious, please point me at it.
>>
>> (I have found a table on the web, which contains the information that I need, but it is only accessible "by eye" as far as I can discern.)
>>
>> Supplementary question:  Suppose I have the string "00A3" stored in
>> an object called "yyy".
>
>
>> intToUtf8(as.hexmode('00A3'))
> [1] "£"
>
>
>>   How do I put that string together with "\u"
>> so as to obtain "£"?  I thought I could do
>>
>> 	xxx <- paste("\u",yyy,sep="")
>>
>> but R won't let me use "\u" "without hex digits".  How can I get around this?
>>
>> Thanks.
>>
>> cheers,
>>
>> Rolf Turner
>>
>> ______________________________________________
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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
> Alameda, CA, USA
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>