Accelerating MATLAB Performance

129Standard Performance-Tuning Techniques

Note that absence of this warning does not imply that a code segment is actually used.

For example, we are not warned about calling a function that does nothing useful.

MATLAB’s editor (Code Analyzer) cannot detect all forms of unnecessary computa-

tions. For example, a very common MATLAB pitfall is multiple unnecessary data trans-

pose. Quite often, the code will run exactly the same when the data is not transposed.

Transposing data is very efcient for small data arrays, but can become a performance hog

when repeated within a loop, or when applied to large data:

data = rand(10000); % 10K x 10K = ~800MB ...