MATLAB provides various functions like permute(), transpose(), and reshape() allowing one to change the dimensions of an array and reorder its elements. At times, however, I find I wish to do things similar to these, but where instead of reordering the individual scalar entries of an array, certain sub-blocks are treated as the "elements". Thus, for instance, if A, B, C, and D are matrices of the same size and M=[A B;C D] is a block matrix, I would like to transpose the block positions to obtain M=[A C; B D] but without reordering the contents of the sub-matrices A,B,C, and D themselves.
This FEX submission contains a set of files for doing just this kind of thing. The assumption throughout is that the sub-blocks are equal-sized sub-tiles of the given array. The tools work on any MATLAB array that can be reshaped and permuted in N-dimensions. They will also work for sparse matrices if you download my ndSparse class.
The usage of these tools is demonstrated in the Examples tab.