# color region in the plot based on the values

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Turbulence Analysis am 2 Nov. 2023
Kommentiert: Star Strider am 2 Nov. 2023
Hi,
In the attached array, I need to color the region based on whenever A(:,2) is greater than 5. I tried yregion,seems this will work only in 2023.
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Dyuman Joshi am 2 Nov. 2023
Which version of MATLAB are you using?
If you want an output similar to what yregion provies, what is the upper limit for the region?
If it is not similar to that, what is the expected output? A visual example would be helpful.
Dyuman Joshi am 2 Nov. 2023
You forgot to provide the end values -
Red color from 5 to what? Inf?
Similarly, green color from what to 5? -Inf?
And I suppose the x-limits should be the range of the x values i.e. A(:,1)?

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### Akzeptierte Antwort

Star Strider am 2 Nov. 2023
Try this —
A = LD.A
A = 12493×2
-5.3531 1.3833 -5.1375 1.5149 -5.1375 1.5471 -5.1375 1.6226 -5.1375 1.6774 -5.1375 1.3851 -5.1375 1.5581 -5.1375 1.5314 -4.9938 1.7729 -4.9938 1.5963
thrshld = 5;
Lv = A(:,2) > thrshld;
idx1 = find(Lv);
idx2 = idx1(diff([0; idx1]) == 1);
% [x1,x2] = bounds(idx2)
idx2 = min(idx2) : max(idx2);
figure
plot(A(:,1), A(:,2))
hold on
patch([A(idx2,1); flip(A(idx2,1))], [thrshld+zeros(size(A(idx2,2))); flip(A(idx2,2))], 'r', 'FaceAlpha',0.5, 'EdgeColor','none')
patch([A(idx2,1); flip(A(idx2,1))], [min(ylim)+zeros(size(A(idx2,2))); thrshld+zeros(size(A(idx2,2)))], 'g', 'FaceAlpha',0.5, 'EdgeColor','none')
hold off
grid
.
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Turbulence Analysis am 2 Nov. 2023
Perfect! Thanks again
Star Strider am 2 Nov. 2023
As always, my pleasure!

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