[R] initiate elements in a dataframe with lists

[Thierry Onkelinx]

Dear Bogdan,

You are looking for x$intersectA <- vector("list", nrow(x))

Best regards,


ir. Thierry Onkelinx
Statisticus / Statistician

Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
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2018-07-25 8:55 GMT+02:00 Bogdan Tanasa <tanasa using gmail.com>:

> Dear all,
>
> assuming that I do have a dataframe like :
>
> x <- data.frame(TYPE=c("DEL", "DEL", "DUP", "TRA", "INV", "TRA"),
> CHRA=c("chr1", "chr1", "chr1", "chr1", "chr2", "chr2"),
> POSA=c(10, 15, 120, 340, 100, 220),
> CHRB=c("chr1", "chr1", "chr1", "chr2", "chr2", "chr1"),
> POSB=c(30, 100, 300, 20, 200, 320)) ,
>
> how could I initiate another 2 columns in x, where each element in these 2
> columns is going to be a list (the list could be updated later). Thank you
> !
>
> Shall I do,
>
> for (i in 1:dim(x)[1]) { x$intersectA[i] <- list()}
>
> for (i in 1:dim(x)[1]) { x$intersectB[i] <- list()}
>
> nothing is happening. Thank you very much !
>
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>
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