Form a matrix from elements of a second matrix

Suppose if I have a matrix like this:

Time = [1;2;3;4;5;6;7;8;9;10]
Diameter = [1;2;3;4;5;6;7;8;9;10]

If I want to form two matrices, one for diameters less than 6 and other for diameters greater than 6, how can I do that? I also need times for the corresponding diameters on each matrix.

Thanks.

Answer 1

[Matt Fig]

Your question is a little unclear, but I think you can get what you want with logical indexing.

idx = Diameter<6;  % A logical index.
D1 = Diameter(idx);
T1 = Time(idx);
D2 = Diameter(~idx);
T2 = Time(~idx);