本文主要是介绍matlab中的persistent变量类型，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
- 查看matlab函数或变量类型的方法： 在matlab的command命令行中输入 open ***.m
- 下面是open persistent.m
原定义
%PERSISTENT Define persistent variable.
% PERSISTENT X Y Z defines X, Y, and Z as variables that are local
% to the function in which they are declared yet their values are
% retained in memory between calls to the function. Persistent
% variables are similar to global variables because MATLAB creates
% permanent storage for both. They differ from global variables in
% that persistent variables are known only to the function in which
% they are declared. This prevents persistent variables from being
% changed by other functions or from the MATLAB command line.
%
% Whenever you clear or modify a function that is in memory, MATLAB also
% clears all persistent variables declared by that function. To keep a
% function in memory until MATLAB quits, use MLOCK.
%
% If the persistent variable does not exist the first time you issue
% the PERSISTENT statement, it will be initialized to the empty matrix.
%
% It is an error to declare a variable persistent if a variable with
% the same name exists in the current workspace.
解释为：
1.作用范围和生存周期：persistent变量只在其被定义的函数中持久有效，函数外不认识，也不能被调用或改变，且在程序运行过程中，该值始终被保存在内存中，每次进入对应的函数，其值就变为可更改模式，当整个程序运行完后，persistent变量内存才被释放。
2.初始化：这样的变量在定以后被自动初始化为空矩阵。
3.命名：在整个工作区中，不允许有其他变量和persistent变量同名，就像global变量一样。
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