[R] how to overlook the zero in the denominator
Christoph Buser
buser at stat.math.ethz.ch
Wed Jul 27 11:09:53 CEST 2005
What about
x<-c(0,0,0.28,0.55,1.2,2,1.95,1.85,
1.6,0.86,0.78,0.6,0.21,0.18)
y<-c(0,0,0,0.53,1.34,1.79,2.07,1.88,
1.52,0.92,0.71,0.55,0.32,0.19)
sum(((x-y)^2/x)[x!=0])
Regards,
Christoph Buser
--------------------------------------------------------------
Christoph Buser <buser at stat.math.ethz.ch>
Seminar fuer Statistik, LEO C13
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-44-632-4673 fax: 632-1228
http://stat.ethz.ch/~buser/
--------------------------------------------------------------
Chun-Ying Lee writes:
> Dear R users:
>
> I have two set of data, as follow:
> x<-c(0,0,0.28,0.55,1.2,2,1.95,1.85,
> 1.6,0.86,0.78,0.6,0.21,0.18)
> y<-c(0,0,0,0.53,1.34,1.79,2.07,1.88,
> 1.52,0.92,0.71,0.55,0.32,0.19)
> i<-1:length(x)
>
> I want to sum each (x[i]-y[i])^2/x[i] together,
> like:
> >Sum <-sum((x[i]-y[i])^2/x[i])
> >Sum
> [1] NaN
>
> Because the denominator shoud not be zero.
> So I want to overlook those when x[i]=0,
> and just to sum those x[i] not equal to 0.
> What should I do?
> Any suggestion.
> Thanks in advance !!
>
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