[R] remove leading slash

[William Dunlap]

Can you tell us why you are interested in this mapping?
I.e., how did the "\001" and "\102" arise and why do you
want to convert them to the integers 1 and 102?

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Ben quant
> Sent: Friday, June 08, 2012 11:00 AM
> To: Duncan Murdoch
> Cc: r-help at r-project.org
> Subject: Re: [R] remove leading slash
> 
> Thanks for all your help.  I did it this way:
> 
> > x = sapply(cnt_str,deparse)
> > x
>        \002        \001        \002
> "\"\\002\"" "\"\\001\"" "\"\\102\""
> > as.numeric(substr(x,3,5))
> [1]   2   1 102
> 
> ...which is a bit of a hack, but gets me where I want to go.
> 
> Thanks,
> Ben
> 
> On Fri, Jun 8, 2012 at 11:56 AM, Duncan Murdoch <murdoch.duncan at gmail.com>wrote:
> 
> > On 08/06/2012 1:50 PM, Peter Langfelder wrote:
> >
> >> On Fri, Jun 8, 2012 at 10:25 AM, David
> Winsemius<dwinsemius at comcast.**net<dwinsemius at comcast.net>>
> >>  wrote:
> >> >
> >> >  On Jun 8, 2012, at 1:11 PM, Ben quant wrote:
> >> >
> >> >>  Hello,
> >> >>
> >> >>  How do I change this:
> >> >>>
> >> >>>  cnt_str
> >> >>
> >> >>  [1] "\002" "\001" "\102"
> >> >>
> >> >>  ...to this:
> >> >>>
> >> >>>  cnt_str
> >> >>
> >> >>  [1] "2" "1" "102"
> >> >>
> >> >>  Having trouble because of this:
> >> >>>
> >> >>>  nchar(cnt_str[1])
> >> >>
> >> >>  [1] 1
> >> >
> >> >
> >> >  "\001" is ASCII cntrl-A, a single character.
> >> >
> >> >  ?Quotes   # not the first, second or third place I looked but I knew I
> >> had
> >> >  seen it before.
> >>
> >> If you still want to obtain the actual codes, you will be able to get
> >> the number using utf8ToInt from package base or AsciiToInt from
> >> package sfsmisc. By default, the integer codes will be printed in base
> >> 10, though.
> >>
> >
> > You could use
> >
> > > as.octmode(as.integer(**charToRaw("\102")))
> > [1] "102"
> >
> > if you really want the octal versions.  Doesn't work so well on "\1022"
> > though (because that's two characters long).
> >
> > Duncan Murdoch
> >
> >
> >> A roundabout way, assuming your are on a *nix system, would be to
> >> dump() cnt_str into a file, say tmp.txt, then run in a shell (or using
> >> system() ) something like
> >>
> >> sed --in-place 's/\\//g' tmp.txt
> >>
> >> to remove the slashes, then use
> >>
> >> cnt_str_new = read.table("tmp.txt")
> >>
> >> in R to get the codes back in. I'll let you iron out the details.
> >>
> >> Peter
> >>
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> >>
> >
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> >
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