Filled 2D plot

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Ironhide Jr
Ironhide Jr 2021-4-16
评论： Star Strider 2021-4-18
I have 3 vectors, X,Y,Z in which X,Y generates one plot and X,Z generates another. However, what I want to do is plot X,Y as a 2D plot and fill the area between the curve and the X axis with colors based on the Z values. I tried using the contour plot but failed. However, then I managed to change the colour of the curve based on the Z value as follows, but I need the complete area under the curve to be filled. Is there any advice?
c= cos(Z).^2;
colormap(hsv)
patch(X,Y,Z,c,'FaceColor','none','EdgeColor','interp')
  2 个评论
DGM
DGM 2021-4-16
Please provide a sufficient amount of code to constitute an example of what you're trying to do.
Ironhide Jr
Ironhide Jr 2021-4-16
编辑：Ironhide Jr 2021-4-16
A brief example of the data would be as,
X=1:22000;
Y=2:2:44000;
Z=rand(1,22000);
Now I can plot X and Y in 2D as well as X and Z in 2D. However, to make the data more concise, I am trying to plot a single figure of X vs Y in which, the area under the curve is colored based on the value of Z at that region.
I have also attached an actual dataset marked directly as X,Y and Z.
Thank you

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Star Strider
Star Strider 2021-4-17
My apologies for the delay. I was working on other things most of today.
‘However, to make the data more concise, I am trying to plot a single figure of X vs Y in which, the area under the curve is colored based on the value of Z at that region.’
This was a bit of a challenge! However it seems to do what was requested.
The Code —
XL = load('X.mat');
YL = load('Y.mat');
ZL = load('Z.mat');
X = XL.X;
Y = YL.Y;
Z = ZL.Z;
figure
plot(X, Y)
hold on
patch([X; flipud(X)], [Y; zeros(size(Y))], [Z; flipud(Z)])
hold off
grid
cb = colorbar;
cb.Label.String = 'Z Value';
xlabel('X')
ylabel('Y')
title('Full Patch Plot')
figure
plot(X, Y)
hold on
patch([X; flipud(X)], [Y; zeros(size(Y))], [Z; flipud(Z)])
hold off
grid
cb = colorbar;
cb.Label.String = 'Z Value';
xlabel('X')
ylabel('Y')
title('Zoom Detail Patch Plot')
axis([0 20 0 5E-3])
figure
plot(X, Z)
grid
The Plots —
The ‘Z’ value is very high only in a very small part of the patch object, so the ‘zoomed’ plot is necessary to demonstrate that the code does what was requested. The maximum value of ‘Z’ occurs at an ‘X’ value of about 3.22, and that is where the colour changes the most. The ‘Z’ value is actually quite noisy, accounting for the ‘striated’ appearance of the patch colours.
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Ironhide Jr
Ironhide Jr 2021-4-18
Thanks man. Really appreciate the support.
Star Strider
Star Strider 2021-4-18
As always, my pleasure!

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