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(13) Preallocation
Performance Increase - Preallocation
Preallocation of Variables creates a contiguous memory space at the start
Otherwise matlab creates different size memory blocks at each step
Preallocation example:
% Use preallocation
pre_alloc = zeros(1000,1);
for i=1,1000
pre_alloc(i)=rand(1);
end
% No preallocation:
for i=1,1000
not_pre_alloc(i)=rand(1);
end
try:
>> pre_allocate
Preallocation.src last modified Oct 17, 2007
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