Consider preallocating for speed

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Tom
Tom le 13 Fév 2014
Modifié(e) : per isakson le 13 Fév 2014
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

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Réponses (1)

per isakson
per isakson le 13 Fév 2014
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
  2 commentaires
Tom
Tom le 13 Fév 2014
That was pretty much what I thought. However I'm getting:
Subscripted assignment dimension mismatch.
Any idea what I'm doing wrong?
per isakson
per isakson le 13 Fév 2014
Modifié(e) : per isakson le 13 Fév 2014
Dimension of left and right hand side must agree for existing variables(??)
Show a line, which causes this error.
The Mathworks server is choked?

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