求曲率半径 三角形内最大可围成面积 到三角形三顶点距离之和最小的点-In seeking the maximum radius of curvature of the triangular area bounded to the three vertices of the triangle and the minimum distance between points

知道型点值和端点值，用双三次曲线分别计算每一段表达式，并画出图-Matlab know type of point and endpoint value, using cubic spline curve to calculate each expression, and draw a diagram