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今天小编为大家带来每周学点Mathmatica——变量的命名，欢迎您的用心访问！本期推文时长大约3分钟，请您耐心阅读。
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Today, the editor brings the Learn Mathmatica every week -- Variable Usage. Welcome to visit! This tweet usually takes about 3 minutes to read. Please read patiently.
01 变量的命名
Mathematica中有许多常用的内部数学函数，如三角函数—Sin[x]，绝对值函数—Abs[x]，指数函数—Exp[x]等。除此之外，还包括许多内部常数，如圆周率π—Pi，自然对数的底数e—E，虚数单位i —I,度—Degree等。
Mathematica has many commonly used internal mathematical functions, such as trigonometric function Sin [x], absolute value function Abs [x], exponential function Exp [x], etc. In addition, it also includes many internal constants, such as pi Pi, the base e-E of natural logarithm, imaginary unit i-I, degree Degree, etc.
这些常用的内部数学函数和常用常数都是以大写字母开头。
These commonly used internal mathematical functions and constants begin with capital letters.
为了避免与其混淆，我们自定义变量时，尽量以小写字母开始，后面跟数字或者英文字母的组合，采用这样的一个命名规则。
In order to avoid confusion, we try to use such a naming rule when defining variables, starting with lowercase letters followed by numbers or English letters.
如果在我们没有了解到Mathematica中的内部数学函数或者常用变量时，误将内部数学函数或者常用变量作为我们自定义的变量，那么软件就会弹出对应的提示。
If we do not know the internal mathematical functions or common variables in Mathematica, and mistakenly use the internal mathematical functions or common variables as our user-defined variables, the software will pop up the corresponding prompt.
举个栗子：
For example:
当我们在不了解内部常数自然对数的底数e—E，虚数单位i —I时，误将其用作自定义变量。那么软件在执行相应操作时，就会有橙色字的提示，如下图所示：
When we do not know the base e-E and imaginary unit i-I of the natural logarithm of the internal constant, we mistakenly use it as a user-defined variable. When the software executes the corresponding operation, it will display an orange prompt, as shown in the following figure:
如果我们按照小写字母开头的自定义命名规则，就可以规避这种问题。
If we follow the custom naming rules starting with lowercase letters, we can avoid this problem.
02 常用内部数学函数
| 指数 | Exp[x] | 正割 | Sec[x] |
| 对数 | Log[a,x] | 余割 | Csc[x] |
| 开方 | Sqrt[x] | 实部 | Re[z] |
| 绝对值 | Abs[x] | 虚部 | Im[z] |
| 正弦 | Sin[x] | 正切 | Tan[x] |
| 余弦 | Cos[x] | 余切 | Cot[x] |
END
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参考资料：Deepl翻译、百度
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