How to calculate the image gradient (for 100 images) for once and save it into the MATLAB workspace?

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mun1013 2015-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/215323-how-to-calculate-the-image-gradient-for-100-images-for-once-and-save-it-into-the-matlab-workspace

I am working on image processing for weed density estimation using Hough Transform and calculate the image gradient (Gmag and Gdir), but I have to calculate the image gradient for 100 images, how to calculate the image gradient for all the images for once so that I don't need to calculate it one by one?