How to pick random values in a vector

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Navya Snigdha Thumma 2015-10-3

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https://ww2.mathworks.cn/matlabcentral/answers/246638-how-to-pick-random-values-in-a-vector

评论： Navya Snigdha Thumma 2015-10-3

How to pick randomly intensities with non zero values in an image. I want to pick only two intensities. My answer should be (x1,y1) and (x2,y2) which are row and column values of particular image. Please help. Thanks.

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Answer 1

Walter Roberson 2015-10-3

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https://ww2.mathworks.cn/matlabcentral/answers/246638-how-to-pick-random-values-in-a-vector#answer_194586

在 MATLAB Online 中打开

idx = find(YourImage ~= 0);
randidx = idx(randperm(length(idx),2));
[x, y] = ind2sub(size(YourImage), randidx);
x1 = x(1); x2 = x(2); y1 = y(1); y2 = y(2);

Caution: when you are talking about images, x is the column number, not the row number. I left it in the order you specified, but if you try to use it to plot with you will see that what you asked for is not the way it works.