How to create a quadrant-circle shape-matrix?

2016 1 31
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更新时间：2016 1 31
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Currently I have a problem with creating a matrix with a quadrant-shape. The problem is as follow:
I would like to have a 138 x 140 matrix with values of 2 and 3. Inside and on the quadrant circle, the values should be 2. Everything outside the circle, I need to have a value of 3. The radius of the circle is 138 (=R138).
I was thinking of using 'triu' (and then flip) in matlab: then I will not get a circle, but a triangle instead (have not tried it yet). And that is not what I want.
What is the simplest way to create this matrix?

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