Create a matrix of dummy vectors (consisting of 0 and 1 only) from factor x. This may be useful if you want to use dummy predictors in regression analysis.
as.dummies ( x )
Levels of the input factor correspond with columns in the output matrix. The integer value in cell [i,j] of the returned matrix indicates whether (value=1) or not (value=0) the i'th observation in the input factor x has the value of the j'th level of that factor.
Matrix of integer values 0 or 1. The number of rows of the returned matrix equals the length of the input factor, and the number of columns equals the number of levels of the input factor.