How to get and 3D matrix from 2 2D matirces?

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Paramveer Singh GopalSingh
回答： Hiro Yoshino 2022-5-30
Hi I have 2 structures(of many cells) that plot the 2d coordinates of a particle in XY coordinates and YZ cordinates and I want to create a structre that gives me the 3D coordinate from them by matching the points in at the Y plane? Any idea how to approach this issue?

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Hiro Yoshino
Hiro Yoshino 2022-5-30
Ran in:
How about the following solution using "ismember" ?
% xy - 2D matrix
x = [1 2 3 4 5]';
y1 = [3 2 1 4 5]';
xy = [x,y1]
xy = 5×2
1 3 2 2 3 1 4 4 5 5
%yz - 2D matrix
y2 = [1 2 3 4 5]';
z = [10 15 3 4 9]';
yz = [y2,z]
yz = 5×2
1 10 2 15 3 3 4 4 5 9
% correspondance:
[idx, loc]=ismember(y1,y2);
% check if y1 and y2(loc) are identical
y1
y1 = 5×1
3 2 1 4 5
y2(loc)
ans = 5×1
3 2 1 4 5
% 3D matrix
xyz = [x,y1,z(loc)]
xyz = 5×3
1 3 3 2 2 15 3 1 10 4 4 4 5 5 9

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