x or y intercept for 2D data

2024 2 9
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更新时间：2024 2 11
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I have a 2D data of the form u(y, xi, l). Ie., 31x20x20, where 31 are values of y, 20 are u values that corresponds to 20 xi values and 20 corresponds to 20 l values. How can I find the y intercept of this data? Then plot the contour(xi, l, yintercept)
The code I added is for 1D data. The attached files are 2D data.
clc
uatL = load('u_L.mat');
%xi=load('xivals.mat');
%l= load("lvals.mat");
u_L = uatL.uxl;
y = load('y_vals.mat')
U=u_L(1,:);
for k1 = 1:size(u_L,1)
U = u_L(k1,:);
Usign =sign(U);
intsx = find(diff(Usign));
for k2 = 1:numel(intsx)
idxrng = max(1,intsx(k2)-1) : min(numel(U),intsx(k2)+1);
yintercept(k1,k2) = interp1(U(idxrng), y(idxrng), 0);
end
end
Unrecognized function or variable 'y'.

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Matt J
Matt J 2024-2-10
As you can see from the output of your code above, y is missing. Also, please do us a favor and put all of your variables in a single .mat file, so that we don't have to download 4 separate files.
Walter Roberson
Walter Roberson 2024-2-10
You do not use the xi or l that you load()
University
University 2024-2-10
Sorry that I have to upload the files one by one. I have uploaded the y values one. The data u_L has computed for xi and l values already.
University
University 2024-2-11
编辑：University 2024-2-11
Hi Walter,
%
I want to a contour plot of y-location of intercept point of ( uxr and uxl) as a contour plot as a function of xivlas and Lvals.
I have tried the for one values of xivals and all lvals, which was successful. But I want the intercept for all xivals and all lvals.
for k1 = 1:size(uxl,1)
Ul = uxl(k1,:);
Usignl =sign(Ul);
intsxl = find(diff(Usignl));
for k2 = 1:numel(intsxl)
idxrngl = max(1,intsxl(k2)-1) : min(numel(Ul),intsxl(k2)+1);
yinterceptl(k1,k2) = interp1(Ul(idxrngl), y(idxrngl), 0);
end
end

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