Consider preallocating for speed

Tom
2014 2 13
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更新时间：2014 2 13
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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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回答（1 个）

per isakson
per isakson 2014-2-13

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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

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Tom
Tom 2014-2-13
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 2014-2-13
编辑：per isakson 2014-2-13
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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Tom
Tom
2014-2-13

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per isakson
per isakson
2014-2-13

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