Consider preallocating for speed

Hello,

My lengthy program is littered with 'Consider preallocating for speed' suggestions for numerous variables.

What does a more experienced programmer do to circumvent this? Do I really need to allocate space at the start for every variable which this is suggested for?

Kind regards,

Tom

Answer 1

[per isakson]

Litter the program with lines like

    A = zeros(25000, 10000);

and read http://www.mathworks.se/help/matlab/matlab_prog/preallocate-memory-for-a-cell-array.html

[Tom]

That was pretty much what I thought. However I'm getting:

Subscripted assignment dimension mismatch.

Any idea what I'm doing wrong?

[per isakson]

Dimension of left and right hand side must agree for existing variables(??)

Show a line, which causes this error.

The Mathworks server is choked?