mathematical operation on each element of gpuArray

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Rouhan Noor 2018-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/378358-mathematical-operation-on-each-element-of-gpuarray

编辑： Matt J 2018-1-22

How can i do mathematical operation on each element of gpuArray with the equation below? s = 2r(i, j) − r(i, j +1) + r(i, j −1). here r is the image matrix. I've written the code below:

 im = imread('(HTC-1-M7)1.jpg');
tic
 img = gpuArray(im);
    for j =2: size(im,2) -1
        A(:,:,:) = 2*img(:, :,:) -img(:,j+1,:) + img(:, j-1,:);       
    end
B = gather(A);
toc

Is there anyway to apply equation on each element of gpuarray with function like arrayfun without using loop? Thanks in advance.

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Matt J 2018-1-22

在 MATLAB Online 中打开

Are you certain that it is not a 2nd order differencing filter that you want:

s = 2r(i, j) − r(i, j +1) - r(i, j −1)

Rouhan Noor 2018-1-22

编辑：Rouhan Noor 2018-1-22

actually I found it from a research paper from IEEE. They derive this equation for row wise(x-axis) second order differentiation. But i have come to know about imgradientxy function, not sure this function does the same stuff like this equation or not.

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