Dear R users! I have a data frame with first column is an interval (1902-1931) and I want to find the middle of the interval? Is there a possibility to do that in R? Thank you very much! Best regards! -- - - Catalin-Constantin ROIBU ? Lecturer PhD, Forestry engineer Forestry Faculty of Suceava Str. Universitatii no. 13, Suceava, 720229, Romania office phone +4 0230 52 29 78, ext. 531 mobile phone +4 0745 53 18 01 FAX: +4 0230 52 16 64 silvic.usv.ro <http://www.usv.ro/> [[alternative HTML version deleted]]
On 08/02/2016 5:09 AM, catalin roibu wrote:> Dear R users! > > I have a data frame with first column is an interval (1902-1931) and I want > to find the middle of the interval? Is there a possibility to do that in R? > > Thank you very much! > > Best regards! >I don't know of a single function that does that, but the way to do it would be to separate the interval into two numbers, then take the average. If your intervals are strings in the form shown above (not including the parentheses), this would work: interval <- "1902-1931" start <- as.numeric(sub("-.*", "", interval)) stop <- as.numeric(sub(".*-", "", interval)) (start + stop)/2 Duncan Murdoch
Hi
you have got one answer, here is another
interval <- c("1902-1931", "1912-1930",
"1902-1951")
(as.numeric(substr(interval, 1,4))+as.numeric(substr(interval,
nchar(interval)-3, nchar(interval))))/2
[1] 1916.5 1921.0 1926.5
It works only if positions of years in intervals is first and last 4 characters.
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of catalin
> roibu
> Sent: Monday, February 08, 2016 11:09 AM
> To: r-help at r-project.org
> Subject: [R] middle of interval
>
> Dear R users!
>
> I have a data frame with first column is an interval (1902-1931) and I
> want to find the middle of the interval? Is there a possibility to do
> that in R?
>
> Thank you very much!
>
> Best regards!
>
> --
>
> -
> -
> Catalin-Constantin ROIBU
> ?
> Lecturer PhD, Forestry engineer
> Forestry Faculty of Suceava
> Str. Universitatii no. 13, Suceava, 720229, Romania
> office phone +4 0230 52 29 78, ext. 531
> mobile phone +4 0745 53 18 01
> FAX: +4 0230 52 16 64
> silvic.usv.ro <http://www.usv.ro/>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
________________________________
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Here is another approach:> interval <- c("1902-1931", "1912-1930", "1902-1951") > sapply(strsplit(interval, "-"), function(x) mean(as.numeric(x)))[1] 1916.5 1921.0 1926.5 ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of PIKAL Petr Sent: Monday, February 8, 2016 4:45 AM To: catalin roibu; r-help at r-project.org Subject: Re: [R] middle of interval Hi you have got one answer, here is another interval <- c("1902-1931", "1912-1930", "1902-1951") (as.numeric(substr(interval, 1,4))+as.numeric(substr(interval, nchar(interval)-3, nchar(interval))))/2 [1] 1916.5 1921.0 1926.5 It works only if positions of years in intervals is first and last 4 characters. Cheers Petr> -----Original Message----- > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of catalin > roibu > Sent: Monday, February 08, 2016 11:09 AM > To: r-help at r-project.org > Subject: [R] middle of interval > > Dear R users! > > I have a data frame with first column is an interval (1902-1931) and I > want to find the middle of the interval? Is there a possibility to do > that in R? > > Thank you very much! > > Best regards! > > -- > > - > - > Catalin-Constantin ROIBU > ? > Lecturer PhD, Forestry engineer > Forestry Faculty of Suceava > Str. Universitatii no. 13, Suceava, 720229, Romania > office phone +4 0230 52 29 78, ext. 531 > mobile phone +4 0745 53 18 01 > FAX: +4 0230 52 16 64 > silvic.usv.ro <http://www.usv.ro/> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.________________________________ Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. 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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. 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