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带摩擦的运输方程是 u_t = lambda * u_x = eps * u_xx, 通过变化, 我们得到了, ,其中D是导数矩阵, D2 是二阶导数矩阵 然后, 我们对M进行求特征值(EW), 得到了这种图片, 我想知道这是为什么呢?