Avoid using repmat in CPD registration algorithm

Question

Mark 2012-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/51757-avoid-using-repmat-in-cpd-registration-algorithm

Hi all,

I'm running a coherent point drift (CPD) registration algorithm and I'm having trouble running it on large point clouds because I keep exceeding the maximum variable size. The line of code that is giving me trouble is:

G=repmat(x,[1 1 m])-permute(repmat(y,[1 1 n]),[3 2 1]);

The error message is:

??? Maximum variable size allowed by the program is exceeded.
Error in ==> repmat at 104
    B = A(subs{:});

I'm wondering if anyone has any suggestions as how to avoid using repmat so I can run the code on large data sets.

Thanks!

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Matt J 2012-10-24

Perhaps. What are the dimensions of x and y?

Mark 2012-10-24

编辑：Mark 2012-10-24

I'm not exactly sure as there can be significant deviation in the point clouds. Let's say the largest X will be is 70000 x 3 and the largest Y will be is 4000 x 3.

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