hello Peggy
maybe try this
% Example: Create a control chart
data = randn(30,4); % Example data
controlchart(data);
% Access the chart's graphical elements
chart = gca; % Get current axes
lines = chart.Children % Access chart elements (lines, markers, etc.)
% Change the color of specific elements
Lightgray =[0.8, 0.8, 0.8];
Mediumgray = [0.5, 0.5, 0.5];
Darkgray = [0.2, 0.2, 0.2];
Black = [0, 0, 0];
lines(1).Color = Darkgray; % Change the first line to Dark gray
lines(2).Color = Lightgray; % Change the second line to Light gray
lines(3).Color = Mediumgray; % Change the second line to Medium gray
lines(4).Color = Black; % Change the second line to black
