|Column and row-wise tabulate||R Documentation|
Column and row-wise tabulate of a matrix.
colTabulate(x, max_number = max(x)) rowTabulate(x, max_number = max(x))
An integer matrix with the data. The numbers must start from 1, i.e. 1, 2, 3, 4,... No zeros are allowed. Anything else may cause a crash.
The maximum value of vector x. If you know which is the max number use this argument for faster results or by default max(x).
The functions is written in C++ in order to be as fast as possible.
A matrix where in each column the command "tabulate" has been performed. The number of rows of the returned matrix will be equal to the max_number if given. Otherwise, the functions will find this number.
R implementation and documentation: Manos Papadakis <firstname.lastname@example.org>.
colShuffle, colVars, colmeans
x <- matrix( rbinom(100 * 100, 4, 0.5), ncol = 100 ) system.time( colTabulate(x) ) x <- t(x) system.time( rowTabulate(x) ) x<-NULL
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