Complex
 Usage
• Complex 是用于复数的头。
Notes
• 可以用 x + I y的形式输入一个复数。 • _Complex 用于表示一个模式中的复数。 • 可以使用 Re 和 Im 得到Complex数的实、虚部。
 Further Examples
The number x is only approximately real.
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Chop gets rid of the small imaginary part.
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This defines a rule to convert a complex number into a list made up of its real and imaginary parts.
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You can apply the rule to all the elements of a list.
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