how to discard NaN vectors from a 3D matrix

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Hi, I have a 3D matrix. some of its rows/columns/depth vectors can be all NaN. I wish to creat a new matrix which is the same as the original one only without the NaNs. is there a function that can help me do this ? in 2D i used ismember and just substitute them with []. but for the 3D case im stuck. here is an example code of such matrix
( so I want mat(3:6,:,:) as a new matrix)
any ideas? thanks

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