using fill function to make shaded area

Hi every one!

Is it possible to draw a shaded area (e.g., +- STD of a value) when we have a categorical values on x-axis?

Based on the screenshot I want AA,BB,CC instead of the numbers.(dash line is a value and the shaded area around it can be plus/minus STD)

Many thanks.

Answer 1

[Walter Roberson]

x = categorical({'AA', 'BB', 'CC'});
yraw = rand(50,3);
ymean = mean(yraw,1);
plot(x, ymean, 'b');
s = std(yraw, [], 1);
hold on
fill([x, fliplr(x)], [ymean-s, fliplr(ymean+s)], 'k', 'FaceAlpha', 0.1 )
hold off

[Ham Man]

Great, many thanks Walter!

would it be possible to start a bit before AA and ends a bit after CC? I don't want it to be exactly on AA,CC.

[Ham Man]

Also do you have any idea why I get this issue?

My three categorical data in x-axis are: dp1200,dp850,dp500

After plotting, dp500 moves to the center and the order shows up like this on x-axis:

dp1200,dp500,dp850.

I had to change the last one to dpp500 to get the right order.(used double p!!!)

Thank you!

[Walter Roberson]

Use reordercats to get the order the way you want. The default order is alphanumeric, and dp1200 is before dp500 because the comparison proceeds from the beginning and '1' is before '5'

would it be possible to start a bit before AA and ends a bit after CC

You would need to add additional categories -- for example if you wanted to start 1/10 before AA you would need 32 or so categories in which AA was the 2nd category, CC was the 31'st category, and BB was the middle. And you would probably need to use xticks([AA, BB, CC]) so you got ticks at the right place.

The alternative would be to switch to a numeric axes instead of a categorical axes, and use xticks() to place the marks numerically and xlabels() to write in the appropriate category names.

[Ham Man]

Thank you so much Walter. That works.