该源码给出了常用的积分算法源码。像梯形法，龙贝格，森普斯算法等。-the source is a common source integral algorithm. Act like a trapezoid, Romberg, Senpushi algorithm.

This GM tests a grab-bag of convex and concave polygons. They are triangles, trapezoid, diamond, polygons with lots of edges, several concave polygons.. But rectangles are excluded.