Exclude/hide columns in a dataset
mda.exclcols(x, ind)
dataset with excluded columns
dataset (data frame or matrix).
indices of columns to exclude (numbers, names or logical values)
The method assign attribute 'exclcols', which contains number of columns, which should be
excluded/hidden from calculations and plots (without removing them physically). The argument
ind
should contain column numbers (excluding already hidden), names or logical values.