[R] create index for tapply or by

[Gerrit Eichner]

Hi, Witold,

take a look at

?findIntervals

It might give want you need.

  Hth  --  Gerrit

On Thu, 27 Jun 2013, Witold E Wolski wrote:

> Is there a build in function to create an index for tapply or by given a
> a numeric vector x an a vector of breaks?
>
> What I want to do is:
>
> x <- 1:100
> breaks <- c(0,10,20,50,99,110)
>
> y <- rep(0,length(x))
> for(i in 2:length(breaks)){
>  y[which(x>breaks[i-1] & x <= breaks[i])] <- i
> }
>
> by(x,y,sum)
>
> but I find the code especially th for loop unneRving.
>
>
> -- 
> Witold Eryk Wolski
>
> 	[[alternative HTML version deleted]]
>
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