If you do that then it becomes easier to rotate around its center, which would be at the known point (xc, yc). But if you insist that the existing code must be kept as-is, then it becomes necessary to estimate xc and yc
sorry one more question. I am very new to matlab so what exactly would you type to rotate randomly around (xc,yc)? And how do you inetgrate it into the code you wrote?
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