MATLAB: How can stop “while” loop

3d

Hi, I have a while loop, my code is inside the loop. I want to stop the loop when the same number (must be non zero)created in the matrix from the first row to the last row.
ex.
this matrix is inside the while loop:
U3(:,:,1) = [
0 , 0 , 0 , 1 , 0;
0 , 1 , 0 , 0 , 0;
0 , 1 , 0 , 0 , 1;
0 , 0 , 0 , 0 , 0;
0 , 0 , 0 , 0 , 0
]
U3(:,:,2) = [
0 , 0 , 0 , 0 , 0;
0 , 0 , 0 , 0 , 0;
0 , 1 , 0 , 0 , 1;
0 , 1 , 0 , 0 , 0;
0 , 1 , 0 , 0 , 0
]
U3(:,:,3) = [
0 , 0 , 0 , 0 , 0;
0 , 0 , 0 , 0 , 0;
0 , 1 , 0 , 0 , 1;
0 , 0 , 0 , 0 , 0;
0 , 0 , 0 , 0 , 0
]
Now, the loop will continue but if U3(1,2, 1) becomes equal to 1, the loop will stop. How can I do it?
Note:
The bath from the first row to the last row can go in any direction (x,y,z) but it must pass from the topped row to the bottom row similar to the above example. The bath from the topped row to the bottom row is as:
U3(1,2,1), U3(2,2,1), U3(3,2,1), U3(3,2,2), U3(4,2,2), U3(5,2,2) and U3(3,2,3) ONLY

Best Answer

But how can I do it for 3D matrix?
Note: I might have more than an island, but I want to stop the while loop when any of the islands created a path from the topped row to the bottom row.
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