[R] converting each column of a data frame into a matrix with n rows
David Winsemius
dwinsemius at comcast.net
Wed May 17 21:34:51 CEST 2017
> On May 17, 2017, at 12:18 PM, Davide Piffer <pifferdavide at gmail.com> wrote:
>
> I need to convert each vector of a dataframe into a matrix with 2 rows
> and 2 columns (i.e. contingency table).
> Note I don't want to convert the entire df into a matrix! I want to
> apply a function that converts each 4 elements vector of a df into a 2
> x 2 matrix.
>
> I wrote something like this, but it will not work:
>
> f_matrix=function(x){ matrix (x)
> nrow=2}
> matrix_y=apply(y,2,function(x) f_matrix (x))
Maybe it shold be:
matrix_y_list = lapply(y, function(x) f_matrix (x) )
>
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David Winsemius
Alameda, CA, USA
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