Hi Shuichi,
I understand you want to set the figure's background color and the axes' background color to white. Here's an example of how to do it:
% Create a figure and plot data
figure;
plot(x, y); % Assuming x and y are predefined
% Set figure background to white
set(gcf, 'Color', 'white');
% Set axes background to white
set(gca, 'Color', 'white');
Hope this helps!
