作为引子，你们可能已经知道了，一元微积分里面的一个小把戏，也就是求隐函数微分法。
And, just to motivate that, let me remind you about one trick that you probably know from single variable calculus, namely implicit differentiation.
一种考虑这个问题的办法是，如果你还觉得，二重积分是求体积的话，那这个度量的，就是函数1的图形下的体积。
One way to think about it, if you're really still attached to the idea of double integral as a volume what this measures is the volume below the graph of a function one.
下面是一个样例spl函数，它利用了包装来自MATLAB的ml_inv函数的矩阵求逆函数ml： inv。
The following is a sample SPL function that utilizes the matrix inverse function ml: : inv that wraps the ml_inv function from MATLAB.
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