mathematica如何保留有效数字（小李Talk每周学点Mathmatica）

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今天小编为大家带来每周学点Mathmatica——四种括号的使用，欢迎您的用心访问！本期推文时长大约2分钟，请您耐心阅读。

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Today, the editor brings the Learn Mathmatica every week -- the use of four brackets. Welcome to visit! This tweet usually takes about 2 minutes to read. Please read patiently.

Mathmatica中常用的括号有四种，分别是[方括号]、{花括号}、(圆括号)和[[双方括号]]。今天就和小编一起来看看这四种括号的使用场景吧~

There are four kinds of brackets commonly used in Mathmatica, namely [square bracket], {curly bracket}, (parenthesis) and [[square bracket]]. Let's look at the usage scenarios of these four brackets together with the editor~

01 方括号

Mathmatica中的函数种类很多，不仅有常用的数学函数，还有许多软件特有的函数。平时我们一般用（）来括函数自变量或参数，但是在Mathmatica中，[方括号]承包这个功能。

There are many kinds of functions in Mathmatica, including not only commonly used mathematical functions, but also many software specific functions. Usually we use () to enclose function arguments or parameters, but in Mathmatica, [square brackets] contract this function.

02 花括号

{花括号}表示的是一个表，可以表示向量和矩阵。

{curly brackets} represent a table, which can represent vectors and matrices.

03 双方括号

[双方括号]表示取出矩阵中的某一个元素，如下图所示：

[Brackets] means to take out an element in the matrix, as shown in the following figure:

04 圆括号

（圆括号）可以将括号内的多个式子定义为一个表达式。

（The parentheses） can define multiple expressions within the parentheses as one expression.

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今天的分享就到这里了，如果您对文章有独特的想法，欢迎给我们留言。让我们相约明天，祝您今天过得开心快乐！

That's all for today's sharing. If you have a unique idea about the article, please leave us a message, and let us meet tomorrow. I wish you a happy day!

参考资料：谷歌翻译、百度

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