Thanks Thierry, you made my day :)
On 21 July 2015 at 17:00, Thierry Onkelinx thierry.onkel...@inbo.be wrote:
Please always keep the mailing list in cc.
If mat is a data.frame, then you can use do.call. Then the number of
columns doesn't matter.
do.call(paste, mtcars[, c(mpg, cyl)])
Please always keep the mailing list in cc.
If mat is a data.frame, then you can use do.call. Then the number of
columns doesn't matter.
do.call(paste, mtcars[, c(mpg, cyl)])
do.call(paste, mtcars[, c(mpg, cyl, disp)])
do.call(paste, mtcars)
ir. Thierry Onkelinx
Instituut voor natuur- en
Hi,
The answer to this is probably straightforward, I have a dataframe and I'd
like to build an index of column combinations, e.g.
col1 col2 -- col3 (the index I need)
A 1 1
A 1 1
A 2 2
B 1 3
B 2 4
B 2 4
At
Yes. paste0() can work on vectors. So paste0(mat[, col1], mat[, col2])
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie Kwaliteitszorg / team Biometrics Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
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