How to preallocate 3 D matrix?

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reshdev 2014-9-6

评论： Yu Jiang 2014-9-6

Hello,

Suppose output(:,:) is matrix with 5 rows and 10 columns.

u is from 1 to n. So, i will have n different output(:,:) matrix's which i am saving in outp(:,:,u).

 for u= 1:n
outp(:,:,u) = output(:,:); 
 end

then how can i pre allocate outp(:,:,u) with zeros so that i can increase speed.

will it be outp(:,:,u)= zeros(5*n,10)?

Thank You

Yu Jiang 2014-9-6

编辑：Yu Jiang 2014-9-6

outp(:,:,u)= zeros(5, 10, n)

Guillaume 2014-9-6

Or even simpler:

outp = zeros(5, 10, n);

What you wrote works (if outp didn't exist), it's very confusing.

Yu Jiang 2014-9-6

Guillaume

Your version is much better :)

-Yu

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