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大家好。

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我这里想做的是描述一下

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如何考虑三维图像。

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三维图像是我们表达

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某种多元函数的一种方式，

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那种函数有两个输入，

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或者一个二维输入，

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然后某种一维的输出。

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那么我这里画的是

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f(x,y)等于x的平方加上y平方。

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在我们讨论这个图像前，

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我认为用比喻会有用，

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我们看一看二维图像以及

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稍微提醒一下我们自己那些是怎么运作的，

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我们做的是什么，因为，它和

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三维的是一样的，

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但是它需要稍微多一点视觉化。

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那么二维图像，

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你知道它们有某种函数，

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让我们看一看你有f(x)等于x的平方，

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你视觉化一个函数的任何时候，你尝试

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理解输入和输出

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之间的关系。

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