converts categorial into binary data
B = nan_cat2bin(C); [B,BinLabel] = nan_cat2bin(C,Label); [B,BinLabel] = nan_cat2bin(C,Label,MODE)
each category of each column in D is converted into a logical column
nan_cat2bin([1;2;5;1;5]) results in 1 0 0 0 1 0 0 0 1 1 0 0 0 0 1