Delphine Fontaine a écrit :
> Dear R-users,
>
> I would like to create a new data frame composed of 2 columns of another
> data frame. But it does not give me what I want...
>
>> casesCNST[1:10,]
> case X1 X2 X3 X4 expected
> 1 A1 0 0 0 0 E
> 2 A2 0 0 0 1 C
> 3 A3 0 0 0 2 C
> 4 A4 0 0 0 3 C
> 5 A5 0 0 0 4 C
> 6 A6 0 0 1 0 C
> 7 A7 0 0 1 1 C
> 8 A8 0 0 1 2 C
> 9 A9 0 0 1 3 C
> 10 A10 0 0 1 4 C
>
>> expectedCNST <- data.frame (cbind (casesCNST$case, casesCNST$expected))
>
>> expectedCNST[1:10,]
> X1 X2
> 1 1 4
> 2 112 3
> 3 223 3
> 4 334 3
> 5 445 3
> 6 556 3
> 7 593 3
> 8 604 3
> 9 615 3
> 10 2 3
>
> Why does the variables change ?!?
'Cause you build your new data frame from vectors with no name
(casesCNST$case is a vector with no name). to keep the original names,
you should subset the original data frame, with casesCNST[,c(1,6)] or
casesCNST[,c("case","expected")].
HTH,
Emmanuel Charpentier
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