Random points moving from boundary

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!

Answer 1

[Guillaume]

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.

[davit petraasya]

Thanks Guillaume for the response. It is very close what I want to do. Actually I gave my question a little simple way.Could you please help me to my question again if you can?

So I have box borders X(1.7,7.7) and Y(42.3,47.3). I should choose random 18 small square boxes in the box. The with or length(actually width=length as it is square) of the small boxes would be from 0.1-2.2. The small boxes must be in the big box.

Thank you for your time.

[Guillaume]

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'})

[davit petraasya]

Thank you very much Guillaume. I appreciate very much the help you have given me!