[R] combine two columns

[Gabor Grothendieck]

And here is one minor variation of this:

odd <- seq(1, ncol(mat), 2)
mat[,odd] == mat[,odd+1]

On 11/29/05, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> Try this:
>
> > is.odd <- !array(0:1, ncol(mat))
> > mat[,is.odd] == mat[,!is.odd]
>        A     B     C
> row1 TRUE FALSE  TRUE
> row2 TRUE  TRUE FALSE
>
> On 11/28/05, Georg Otto <georg.otto at tuebingen.mpg.de> wrote:
> > Hi,
> >
> > I have an R programming problem and I havent found anything in the
> > documentation yet:
> >
> > I have a data matrix, in which two neighbouring columns represent
> > replicates of the same experiment, e.g. something like this:
> >
> >       A A B B C C
> > row1   1 1 1 2 2 2
> > row2   1 1 1 1 1 2
> >
> > I would like to test, if the values for the two replicates in a row
> > are the same or if they differ and generate a new matrix with the
> > results of the tests, something like this:
> >
> >        A B C
> > row1    T F T
> > row2    T T F
> >
> > Any hint will be appreciated!
> >
> > Georg
> >
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>