preallocation of structure array for MATLAB coder

Hi, I'm using MATLAB coder to convert my image processing routine in MATLAB.

I read several articles here about structure array preallocation.

Here is my MATLAB code snippet. im1, im2 have size of 480 x 640 x 128.

ptemp.im1 = im1;
ptemp.im2 = im2;
[sx, sy, sz] = size(im1);

picturesque(1:nlevels) = struct('im1',zeros(sx,sy,sz),'im2', zeros(sx,sy,sz));

picturesque(1) = ptemp;

But the MATLAB coder tells me picturesque is not defined.

Undefined function or variable 'picturesque'. The first assignment to a local variable determines its class.

I tried many times, changing preallocation methods. But I didn't find any clue.

Do you have a good solution to preallocate the structure array for MATLAB coder?

Answer 1

[Sean de Wolski]

picturesque = struct('im1',zeros(sx,sy,sz),'im2', zeros(sx,sy,sz));
picturesque = repmat(picturesque,1,nlevels)

Perhaps?

Answer 2

[JangHo Cho]

Thank you. It works! That's what I wanted. :)