prtPreProcZeroMeanColumns   Zero mean feature (columns)
 
    ZMC = prtPreProcZeroMeanColumns creates an object that removes the
    mean from each column (feature) of a data set.
 
    prtPreProcZeroMeanColumns has no user settable properties.
 
    A prtPreProcZeroMeanColumns object also inherits all properties and
    functions from the prtAction class.
 
    Example:
 
    dataSet = prtDataGenIris;             % Load a data set and
    dataSet = dataSet.retainFeatures(1:2);% Retain the first 2 features
    zmc = prtPreProcZeroMeanColumns;      % Create a
                                          % prtPreProcZeroMeanColumns object
 
    zmc = zmc.train(dataSet);             % Train
    dataSetNew = zmc.run(dataSet);        % Run
 
    % Plot
    subplot(2,1,1); plot(dataSet);
    title(sprintf('Mean: %s',mat2str(mean(dataSet.getObservations),2)))
    subplot(2,1,2); plot(dataSetNew);
    title(sprintf('Mean: %s',mat2str(mean(dataSetNew.getObservations),2)))