Accelerating MATLAB Performance

514 Accelerating MATLAB

®

Performance

An alternative technique is to reshape the data using higher dimensions, such that the

subblocks will occupy dimensions that can be operated on in a vectorized manner. For

example, reshape data(X,Y) to data(N, X/N, M, Y/M) and then operate on the subblocks of

size N×M:

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data2 = reshape(A, N, size(A,1)/N, M, size(A,2)/M);

y = squeeze(sum(sum(data2,1),3))/(N*M); % mean values of all sub-blocks

Splitting up a large data set into separate independent data subblocks enables parallel-

ization, if we have the relevant hardware and software support for this. Parallelizing such

independent subblocks can signicantly ...