[R] format negative numbers

[PIKAL Petr]

Thanks to all

It seems that negative format nnnn- is very rare so there is no interest in providing some function for changing such numbers to "correct" ones. My function seems to be similar to solution of others so I stay with it for the time being.

Cheers
Petr


> -----Original Message-----
> From: David Winsemius [mailto:dwinsemius at comcast.net]
> Sent: Monday, October 20, 2014 11:04 PM
> To: PIKAL Petr
> Cc: Marc Girondot; r-help at r-project.org
> Subject: Re: [R] format negative numbers
>
>
> On Oct 20, 2014, at 4:32 AM, PIKAL Petr wrote:
>
> > Hi
> >
> > Thanks to all who responded.
> >
> > My input string is rather clumsy. Actually it can have leading or
> trailing empty space too, it can be mixture of positive and negative
> numbers.
> >
> > In the meantime I made small function which just strips of - sign and
> make numbers from factors, find numbers which have - sign and change
> numbers which shall be negative to negative. Not as elegant as your
> solution but works even when there are leading or trailing spaces.
> >
> > zapor <- function(x) {
> > num<-as.numeric(gsub("(-)", "", x))
>
> Might want to just use sub() since your method would accept things like
> "-----100----"
>
> > zap<- grep("-", x)
> > num[zap]<- num[zap] * (-1)
> > num}
> >
> >> x <- as.factor( c("   123.4-   " , "   123   "))
> >> zapor(x)
> > [1] -123.4  123.0
> >>
>
> gsub("^(\\s+)([0-9.]+)(-){0,1}(\\s)+$", "\\3\\2",
>                 as.factor( c("   123.4-   " , "   123   ") ) )
> [1] "-123.4" "123"
>
> Then just `as.numeric`. You method looks more elegant. Depending on the
> local you may get into trouble with variation in decimal markers.
>
>
> >
> > I just thought that there is some reason for presenting negative
> numbers with minus sign behind the number in finance community and
> therefore somebody already invented clever way how to deal with such
> numbers.
> >
> > Cheers
> > Petr
> >
> >
> >> -----Original Message-----
> >> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> >> project.org] On Behalf Of Marc Girondot
> >> Sent: Monday, October 20, 2014 12:53 PM
> >> To: r-help at r-project.org
> >> Subject: Re: [R] format negative numbers
> >>
> >> Is it what you want?
> >>
> >>> st <- "0.123-"
> >>> gsub("(.+)(-)", "\\2\\1", st)
> >> [1] "-0.123"
> >>> st <- "0.123"
> >>> gsub("(.+)(-)", "\\2\\1", st)
> >> [1] "0.123"
> >>
> >> Sincerely
> >> Marc
> >>
> >> Le 20/10/2014 09:03, PIKAL Petr a écrit :
> >>> Dear all.
> >>>
> >>> Before I start fishing in (for me) murky regular expression waters
> I
> >> try to ask community about changing format of negative numbers.
> >>>
> >>> For some reason I get a file with negative numbers formatted with
> >> negative sign at end of number.
> >>>
> >>> something like
> >>>
> >>> 0.123-
> >>>
> >>> It is imported as factors and I need to convert it to numbers
> again.
> >> Before converting I need to change it to "correct" format
> >>>
> >>> -0.123
> >>>
> >>> Does anybody know some simple way?
> >>>
> >>> Cheers
> >>> Petr
> >>>
> >>>
> >>> ________________________________
> >>> Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a
> >>
>
> David Winsemius
> Alameda, CA, USA


________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.