Random points moving from boundary

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davit petraasya 2016-2-9

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评论： davit petraasya 2016-2-10

Hello

I have square surface(300kmto300km) and I am picking random points(20points) in the surface. My task is my random points should not be close than 10 km to square borders. So how I can give command that if my random point less than 10 km close to square borders choose another point.

Thanks a lot!

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Answer 1

Guillaume 2016-2-9

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Rather than checking if a random point is outside your allowed range and retrying, you'd generate random points within your allowed range to start with:

allowedrange = [10 290];
numpoints = 20;
xy = rand([2, numpoints) * diff(allowedrange) + allowedrange(1) %generate numpoints pairs

See the documentation on how to generate random numbers within a range.

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Guillaume 2016-2-9

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This should work:

sizerange = [0.1 2.2];
boxsize = rand(18, 1) * diff(sizerange) + sizerange(1);
topleft = [1.7 42.3]
bottomright = [7.7 47.3]
boxxy = cell2mat(arrayfun(@(sz) rand(1, 2) .* (bottomright - topleft - sz) + topleft, boxsize, 'UniformOutput', false))
array2table([boxxy boxsize], 'VariableNames', {'X', 'Y', 'Size'})