Accelerating MATLAB Performance

519Memory-Related Techniques

9.7 Additional Recommendations

9.7.1 MATLAB Variables

Some recommendations that appeared in earlier chapters are also related to memory man-

agement, and are therefore repeated here. Some of these can be found in MATLAB’s of-

cial guide Strategies for efcient use of memory.

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Load, process, and save only as much data as you really need, not all of it (see §3.6).

Avoid the form a(:) or d a t a(:,:), but rather use a and data as is, without the (:) parts.

Adding these full-index notations forces MATLAB to unnecessarily parse the data, which

degrades performance:

*

a = rand(1000);

b = rand(1000);

tic; c = a*b;