Re: [R] data frame component replacement: feature or bug? (PR#266)

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Subject: Re: [R] data frame component replacement: feature or bug? (PR#266)
p.dalgaard@biostat.ku.dk
Date: Mon 06 Sep 1999 - 08:00:49 EST


Message-Id: <199909052200.AAA08081@pubhealth.ku.dk>

Matthew Wiener <mcw@ln.nimh.nih.gov> writes:

> t1 <- data.frame(matrix(rnorm(16), nc=4))
> t1$X1 <- 1
> t1$X2 <- 2
> print(t1)
> Error: dim<- length of dims do not match the length of object

Well, it is prototype-compatible. Splus 5.3 does likewise. A way out
is

t1<-data.frame(unclass(t1))

However, we do seem to have a bug in the area:

> t1 <- data.frame(matrix(rnorm(16), nc=4))
> transform(t1,X1=1)
Error: dim<- length of dims do not match the length of object
> transform(t1,X1=1,X2=2)
  X1 X2 X3 X4
1 1 2 0.6020524 1.1595935
2 1 2 -1.8212204 -0.2118746
3 1 2 1.5506706 0.0680275
4 1 2 -0.8872958 0.4709870

This boils down to the construction

dfr[1]<-list(X1=1)

which doesn't extend dfr$X1, whereas

dfr[c(1,2)]<-list(X1=3,X2=4)

does. Splus handles both cases.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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