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

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?

[Sam Chak]

Hi @Paramveer Singh GopalSingh

Can you provide two samples of the 2D matrices?

[Matt J]

@Paramveer Singh GopalSingh

To prevent confusion, avoid terminology like "structure" and "cell" which refer to specific Matlab data types,

https://www.mathworks.com/help/matlab/ref/struct.html

https://www.mathworks.com/help/matlab/cell-arrays.html?searchHighlight=cellarray&s_tid=srchtitle_cellarray_1

unless they are truly what you are using.

Answer 1

[Hiro Yoshino]

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