[R] find position to last number in a vector

[Liaw, Andy]

Is this what you want?

> x
 [1] NA NA 10 NA  2 NA NA  1 NA NA
> y
 [1]  10  20  30  40  50  60  70  80  85 100
> y[max(which(!is.na(x)))]
[1] 80

Andy 

From: Anders Bjørgesæter
> 
> Hello
> 
> Is there a function to extract the position (i.e. row number or more 
> desirable the value from another column with the same rownumber ) of 
> last number in a vector? This is done in a loop with 1000s of columns.
> 
> e.g.
> 
> vector/column.n: na,na,10,na,2,na,na,1,na,na
> fixed column:10,20,30,40,50,60,70,80,85,100
> 
> result: 8 and/or 80
> 
> Thanks...
> 
> Best Regards
> Anders
> 
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