Filling between several curves in a figure using fill or patch functions

Hi

I have a figure, in which 4 curves are plotted. I want to fill between these curves twp by two with a specific color (red, green, ...) I attached the plots I want to fill. How can I do that?

Thanks

Answer 1

[Ameer Hamza]

See this example

y = 1:400;
x1 = 0.1*rand(size(y));
x2 = 0.1*rand(size(y))+1;

x3 = 0.1*rand(size(y))+0.4;
x4 = 0.1*rand(size(y))+1.4;

ax = axes();
hold(ax);
plot(x1, y);
plot(x2, y);

Y = [y fliplr(y)];
X = [x1 fliplr(x2)];
p = patch(X, Y, 'r', 'FaceAlpha', 0.2);

Y = [y fliplr(y)];
X = [x3 fliplr(x4)];
p = patch(X, Y, 'g', 'FaceAlpha', 0.2);

[hamed]

Thanks Ameer,

Is it possible to plot two of the curves in 'reverse X-dir', but at the same figure?

I mean the red and blue curves be on the reverse order (be on the right instead of left) and their "0" starts from left. Then, I need to fill the "white" part on the right by filling between red and blue curves.

[Ameer Hamza]

Yes, it is possible. You need to create two axes objects. Here is an example

y = 1:400;
x1 = 0.1*rand(size(y));
x2 = 0.1*rand(size(y))+1;

x3 = 0.1*rand(size(y))+0.4;
x4 = 0.1*rand(size(y))+1.4;

ax = axes();
ax.XLim = [0 2];
Y = [y fliplr(y)];
X = [x1 fliplr(x2)];
patch(X, Y, 'r', 'FaceAlpha', 0.2);

ax2 = axes();
ax2.Position = ax.Position;
ax2.XAxisLocation = 'top';
ax2.Color = 'none';
ax2.XDir = 'reverse';
ax2.XLim = [0 2];
Y = [y fliplr(y)];
X = [x3 fliplr(x4)];
patch(X, Y, 'g', 'FaceAlpha', 0.2);

[hamed]

Perfect!

Thanks Ameer :)

[hamed]

Hi again Ameer,

I plotted a 1D signal in Matlab, and then I want to show the value of each specific sample by a district colour. something like what "imagesc" command does for 2D plots. I attached an example of what is in my mind. Any suggestions, please?

This is what I have written, but the distribution of the values is weird! I expected a linear behaviour of the values at each sample.

p(1, 2).select();

twt = tie_out_mid.well_log.logs.twt(97:end);

y = twt';

CGR = tie_out_mid.well_log.logs.cgr(97:end);

x = CGR';

x0 = zeros(size(x))';

Y1 = [y fliplr(y)];
X1 = [x0 fliplr(x)];
ColorData = vertcat (x', flip(x'));

patch(X1, Y1, ColorData);

[Ameer Hamza]

Can you show the expected output?