matlab中contour函数的返回值contour matrix C如何使用

[C, H] = CONTOUR(...) returns contour matrix C as described in　 CONTOURC and a handle H to a contourgroup object.  This handle can  be used as input to CLABEL. Ｑ： contour matrix C 如何使用？怎样从Ｃ中提取出轮廓信息？ Ａ

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