Color certain area of normal distribution

Hi all,

I have two normal distributions as below:

 y = normpdf(x,57565.67,1743.56);
 y1 = normpdf(x,54908.02,1663.82);

I would like to set a left horizontal area color when x-axis is 54698, for y plot. At the same plot, I would like to set right horizonal area color when x-axis is 54698, for y1 plot. Is it possible that I can do this from property inspector?

The outcome will be something like this:

Thanks for the help!

Answer 1

[Star Strider]

Try this —

x = linspace(4, 7, 250)*1E4;
y = @(x) normpdf(x,57565.67,1743.56);
y1 = @(x) normpdf(x,54908.02,1663.82);

xp = 54698;
xlx = x<=xp;
xhx = ~xlx;

figure
plot(x, y(x))
hold on
plot(x, y1(x))
patch([x(xlx) flip(x(xlx))], [y(x(xlx)) zeros(size(x(xlx)))], 'b', 'EdgeColor','none', 'FaceAlpha',0.75)
patch([x(xhx) flip(x(xhx))], [y1(x(xhx)) zeros(size(x(xhx)))], 'r', 'EdgeColor','none', 'FaceAlpha',0.95)
plot([1 1]*xp, y1([0 1]*xp), '-k', 'LineWidth',2.5)
hold off
text([5.4  5.6]*1E+4, [1 1]*1E-5, {'\alpha','\beta'}, 'Horiz','center', 'Vert','middle', 'FontWeight','bold', 'Color','g')

Experiment to get different results.

.

[Hokkien]

Thank you so much! I can understand it better right now! I will experiment with it.

[Star Strider]

As always, my pleasure!

Answer 2

[Image Analyst]

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_do_I_shade_the_region_between_two_curves.3F