How to plot shaded areas with legend

Hello MATLAB Community,

I am trying to shade PSD spectrum for specific region for example :

f(ind1:ind2) -> nothing

f(ind3:ind4) -> light shaded area

f(ind5:end) -> dark shaded area

The capture_ref.png is attached for referance. I want same thing on (capture.png) which is generate from MATLAB Script.

Also, There must be legent for both shaded areas.

can any one please help in this regard ?

Thank you in advance.

Answer 1

[KSSV]

Example;

clc; clear all
x = 1:10 ; 
y = rand(size(x)) ; 

figure
hold on
% Region1 
area([x(1:4) x(1)],[y(1:4) y(1)])
area([x(4:7) x(4)],[y(4:7) y(4)])
area([x(7:10) x(7)],[y(7:10) y(7)])

Instead of area you can also use patch, fill.

[Sarfaraz Ahmed]

Hi, Thank you for your answer.

I tried something like this, but it's not as its expected .

figure(3)
[pxx,f] = pwelch(rwave_decimate_1,[],[],[],fs/N);
pxx_n =pxx/max(pxx);
hold on;
area(f(1:13),pxx_n(1:13));
area(f(13:52),pxx_n(13:52),'basevalue',0,'FaceColor','g');
area(f(52:end),pxx_n(52:end),'basevalue',0,'FaceColor','k');
hold off
legend('VLF','LF','HF')   

However, the result is on attached capture.png. what I want is :

a) initial area should not be highlighted and also no legend for 1st area.

b) 2nd and 3rd area should have legend and color should be light shaded and dark shaded as in the capture_ref.png.

I look forward for such answer.

Thank you.