[R] how to overlook the zero in the denominator
Chun-Ying Lee
u9370004 at cc.kmu.edu.tw
Wed Jul 27 10:51:37 CEST 2005
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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