This article presents some usual ways of solving the range of function value.
本文介绍几种常用的求函数值域的方法。
You can select an individual value from an input range using the CHOOSE function, which makes the selection based upon the position of the value in the series. The CHOOSE function takes two arguments.
可以使用CHOOSE函数从输入范围中选择单一值，它根据值在序列中的位置做出选择。
The function returns a specific value (or range of values) to indicate an error, and the global variable errno is set to indicate the cause of the problem.
函数返回特定值(或值范围)以指明错误，且设置全局变量errno以指明问题的起因。
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