MATLAB: How to preallocate 3 D matrix

random number generator

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

Best Answer

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

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MATLAB: Unravel.c function will not compile despite multiple attempts to debug it.

just going through the errors given by the mex-compiler:

you are missing a bracket on line 53, right after mxGetN(prhs[2] you are missing the closing bracket like this:

/*is the last input a scalar*/
        if (!mxIsDouble(prhs[2]) || mxIsComplex(prhs[2]) || mxGetN(prhs[2]) * mxGetM(prhs[2]) != 1)

and at the end you have a } to many so just remove it and I was able to compile it just fine (this however does not guarantee your actual function will work!)

MATLAB: Pre-allocating structures

One way to preallocate:

P(1:2) = struct('x',zeros(10,1),'y',zeros(1,2),'hole',false);
ne = 10;
[S(1:ne).P] = deal(P);

Best Answer

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MATLAB: Unravel.c function will not compile despite multiple attempts to debug it.

MATLAB: Pre-allocating structures

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