当值超过最大或最小点时，如何绘制图形和实线变成点划线? [英] How to draw graph and the solid line turn dash dot line when the value exceed the maximum or minimum point?

问题描述

在图中，我有两条线，即最大点和最小点.当多项式图超过最大值或最小值的限制时，实线变为破折点.值超过最大点或最小点时的虚线?谢谢.

In the graph, I have two line which is maximum point and minimum point..When the polynomial graph exceed the limit of max or min,the solid line become dash dot..How to draw a graph and the line turn dash dot line when the value exceed the maximum or minimum point?Thanks.

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