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))
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