在Matlab里面，newStr = sprintf('%s%d', str, num);代码的含义

Null is a term used in computer programming to indicate the absence of a value. It is a special value that is assigned to a variable or object when no other value is assigned to it. In some programming languages, null is equivalent to zero or false, while in others, it is a distinct value that is treated differently. Null is often used to represent an empty or undefined state, such as when a variable has not yet been initialized or when a database query returns no results.

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Matlab里面将字符串和变量组合成字符串

可以使用字符串拼接操作符"+"。

例如，如果有一个字符串变量str和一个数值变量num，可以将它们组合成一个新的字符串：

newStr = str + num2str(num);

其中，num2str函数将数值转换为字符串。或者，使用sprintf函数也可以完成同样的操作：

newStr = sprintf('%s%d', str, num);