% Check version
if verLessThan('matlab','9.2')
    error('heatmap is available in R2017a or newer.')
end

% Load ride data from Boston's bike sharing program
load CambridgeData cambridge

% Create a heatmap of DayOfWeek vs. AgeGroup, with color representing count
hm = heatmap(cambridge,'AgeGroup','DayOfWeek');

% Change the color to represent average Duration
hm.ColorVariable = 'Duration';
hm.ColorMethod = 'mean';