FAQ 7.31
On Wed, Oct 6, 2010 at 12:02 PM, D. Alain <dialva...@yahoo.de> wrote:
> Hi experts,
>
> I have encountered a strange phenomenon after loading spreadsheet data via
>
>>example<-read.csv("M:\\...\\mydata.csv",header=T)
>
> My data consist of two variables x and y which I have combined to a single
> vector using
>
>>z<-rowSums(cbind(example$x,example$y))
>>z
> [1] 9.79 9.79 17.54 12.59 2.18 9.79 #vector z with 6 elements
>
> Now I want to identify all elements equal to 9.79, so I enter
>
>>which(z==9.79)
>
> And I get the result
>
> [1] 2 6 #R
> failes to identify the fist element!
>
> Taking a futher look at the elements I get the following:
>
>> mode(z)
> [1] "numeric"
>> mode(z[1])
> [1] "numeric"
>> z[1]+z[2] #I can
>> add first and second element
> [1] 19.58
>
> But if I try to apply logical operators I get:
>
>> z[1]==9.79
> [1] FALSE
>> z[2]==9.79
> [1] TRUE
>> z[1]==z[2]
> [1] FALSE
>
> When I reenter the first element via
>> z[1]<-9.79
>> z[1]==9.79
> [1] TRUE
>
> What is wrong with my data? Can anyone help?
>
>> version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 11.1
> year 2010
> month 05
> day 31
> svn rev 52157
> language R
> version.string R version 2.11.1 (2010-05-31)
>
> Thanks
> D. Alain
>
>
>
> ______________________________________________
> R-help@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.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
______________________________________________
R-help@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.
