[R] cbind2() in Matrix
Rui Barradas
ruipbarradas at sapo.pt
Tue Nov 12 19:52:31 CET 2013
Hello,
Maybe using ?Reduce:
Zlist <- c(mat1, mat2, mat3)
Z <- Reduce(cbind2, Zlist)
Ztmp <- cbind2(mat1, mat2)
Z2 <- cbind2(Ztmp, mat3)
identical(Z, Z2) # TRUE
Also, I prefer list(mat1, mat2, mat3), not c().
Hope this helps,
Rui Barradas
Em 12-11-2013 17:20, Doran, Harold escreveu:
> Suppose I have three matrices, such as the following:
>
> mat1 <- Matrix(rnorm(9), 3)
> mat2 <- Matrix(rnorm(9), 3)
> mat3 <- Matrix(rnorm(9), 3)
>
> I now need to column bind these and I could do the following if there were only two of those matrices because cbind2() has an x and y argument
>
> Zlist <- c(mat1, mat2)
> Z <- do.call(cbind2, Zlist)
>
> The following would not work as noted in the help page for cbind2() and I don't think I want to activate cbind() here.
>
> Zlist <- c(mat1, mat2, mat3)
> Z <- do.call(cbind2, Zlist)
>
> So, the object I would want in the end would be
> Ztmp <- cbind2(mat1, mat2)
> Z <- cbind2(Ztmp, mat3)
>
> I never have a large number of these things to combine, so I have solved the problem with a simple loop over the list.
>
> I'm curious though if there is a better (and perhaps) more reliable way to do this?
>
> Thanks,
> Harold
>
> [[alternative HTML version deleted]]
>
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