How to shade several areas in a plot?

Hello everyone,

I want to shade some points in a figure. These points are for example 35 in a plot with the length of 600 point. How can I plot these shades in a for loop?

I actually expect to get somthing like the picture that I have attached. I have a figure with three subplots and I want to shade 35 points of these plots.

Thank you in advance for your helps.

Answer 1

[Star Strider]

Try this —

x = 210:0.5:227;
y = randn(size(x));

bands = [214 216; 221 223];                                                         % X-Coordinates Of Band Limits: [x(1,1) x(1,2); x(2,1) x(2,2)]

figure
plot(x, y)
hold on
xp = [bands fliplr(bands)];                                                         % X-Coordinate Band Definitions 
yp = ([[1;1]*min(ylim); [1;1]*max(ylim)]*ones(1,size(bands,1))).';                  % Y-Coordinate Band Definitions

for k = 1:size(bands,1)                                                             % Plot Bands
    patch(xp(k,:), yp(k,:), [1 1 1]*0.25, 'FaceAlpha',0.5, 'EdgeColor',[1 1 1]*0.25)
end
hold off

This is fully adaptive to the size of the plot limits, requiring only that the ‘bands’ matrix be defined.

I doubt if there is a way to do this without the loop.

.

[Malahat Mehraban]

It was a great solution, Thank you.

[Star Strider]

As always, my pleasure!

.

Answer 2

[Chunru]

x = 210:.5:218;
y =randn(size(x));
plot(x, y); hold on
yl = ylim;
% Use the patch for the box
patch([212 213 213 212], [yl(1) yl(1) yl(2) yl(2)], [0.3 0.3 0.3], 'FaceAlpha', 0.3 )

[Malahat Mehraban]

Thank you :)

Answer 3

[Voss]

Look into patch or fill, which are different ways to do basically the same thing.

In addition to the x- and y-coordinates of the rectangles you want to add to the plots, you'll need to specify the 'AlphaData' property for the transparency and the 'EdgeColor' property for the red lines around the edges. A list of patch properties is here.

[Malahat Mehraban]

Thanks Benjamin :) the like was informative.