how to slice a 3d complex valued matrix

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stefano fiorentini 2016-6-15

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编辑： stefano fiorentini 2016-6-16

Hello,

I'm working with a 3D complex-valued matrix (2D + time). Let's call it B. I'm trying to extract a 2d matrix (1D + time), called A, from B by interpolating values along an arbitrarily oriented segment at every time frame. The segment is defined as a collection of query points (xq, yq are N-by-1 vectors) that do not change between frames. No interpolation is performed along the time dimension. I've accomplished the job by using interp2 in a for loop, therefore by filling the 2d matrix column by column:

    A = zeros(length(xq), size(B,3));
    for k=1:size(B,3)
        A(:,k) = interp2(X, Y, B(:,:,k), xq, yq);
    end

I'm trying to figure out a more efficient way to do this. Unfortunately slice() is not an option as it does not work with complex data. I've looked for interp3() and griddedinterpolant() in the documentation, but I haven't found any example that matches my problem. I've also performed some research in this forum, but to no avail.

Any hint? Thank you for your help.

Stefano