[R] strange behavior of names<-

[Peter Dalgaard]

"Liaw, Andy" <andy_liaw at merck.com> writes:

> [BTW, this is using the tip that Thomas Lumley posted about forming the
> group means.  I've wanted to write a `tsweep' function that's sort of the
> cross of tapply() and sweep().]

Also notice that this is

unsplit(lapply(split(x, g), scale, scale=FALSE), g)

and the generalized sweep might be written along the lines of

unsplit(mapply("-",split(x,g),tapply(x,g,mean)),g)

Can't vouch for the speed, though.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
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