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I am working on a C++ computational geometry code, and i want to make sure whether two points are the same by comparing their x y and z coordinates. The coordinates of the points are in the double formate.

since the pc can not represents the double number exactly in the memory, and i have a large number of points in a small region, i think it is inaccurate to do the comparison by a simple "==".

Could you please give me some advices on that?

Regards

Your Sincerely.

ztdep