如何通过Matlab函数将特定值保存到工作区中? [英] How to save a particular value onto workspace from Matlab function?

问题描述

我有一个m文件，其中包含几个文件，并且我了解使用函数时，这些函数中使用的变量不会保存到Matlab的工作区中.我需要做的就是在Matlab中保存一个变量.有什么方法可以做到这一点?

I have an m file, which contains several files and I understand that when using functions, the variables used within those functions are not saved to the workspace in Matlab. All I need is to save one single variables within Matlab. What are the ways to go about doing this?

推荐答案

有两种方法可以在基本工作区中保存变量，即使用 setappdata 以及 getappdata

Here are 2 ways you can save a variable in the base workspace, i.e. using assignin or setappdata along with getappdata

让我们创建一个虚拟函数来对其进行测试(不要将其命名为assignin，因为这会引起麻烦):

Let's create a dummy function to test it (do not name it assignin as it will cause trouble):

function Test_Assignin(~) %// Dummy function

clear
clc

A =rand(10);

assignin('base','AinWorkspace',A); %/ Assign the variable A (local to the function) to the variable named 'AinWorkspace' in the 'base' workspace, which you can access after running the function.

B = A/2; %// Generate other variable

setappdata(0,'B',B); %// use setappdata to make the variable available to the base workspace (hence the 0 at the beginning), and in your command window use getappdata. (See below).
end

然后，如果要访问工作区中的B，则可以使用getappdata，如下所示:

And then if you want to access B in the workspace, you can use getappdata like so:

BinWorkspace = getappdata(0,'B') %// Use the same name as in the function/call to setappdata.

请注意，在制作用于调用外部函数的GUI时，setappdata/getappdata非常有用.它允许轻松地在回调之间共享数据.

Note that setappdata/getappdata are quite useful when making GUIs in which you call external functions; it allows to easily share data between callbacks.

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