Plot Shaded Area Between Two User-Defined Lines and Beneath Preexisting Data

Question

I am trying to add a grey shaded area between two user-defined vertical lines. I need this gray shaded area to appear beneath my already plotted data. I have tried using the fill and area functions, but haven't been able to successfully create a bounded area to appear underneath the Matlab plot. I need the shaded area plot to extend from the x-axis at vertical lines created at 5.5 and 19 and extend up to the y-axis at 900 (left y-axis) and at 1 (right y-axis). See here: https://www.dropbox.com/s/qyzkuhw17yxn8p5/sample.png

Answer 1

    % Add shaded area to plot

    % Line 1
    hl1 = line(x1,y1,'Color','b'); 

    x = [5.5 5.5 19 19]; y = [0 900 900 0]; % define edges of shaded area

    % Locations for 5:30am and 19:00pm with the left y-axis ranging from 0-900 

    hl2=fill([x(1) x(2) x(3) x(4)], [y(1) y(2) y(3) y(4)],'Color','r','EdgeColor','none','LineStyle','none'); 

    hl1 = line(x1,y1,'Color','b'); % Replot line 1 over shaded area
    hold on; 

    % Continue adding more shaded areas using the fill function or add lines directly...