在一个简单的程序中使用MATLAB的'keyPressFcn

问题描述

我正在尝试在普通的MATLAB脚本中使用'KeyPressFcn'，但是遇到了问题.我可以在一个函数中很好地使用它，(就像这里)，但是我想像这样在普通脚本中使用它.

I am trying to use the 'KeyPressFcn' in a normal MATLAB script, but I am having problems. I can use it nicely WITHIN a function, (like here), but I would like to use it in a normal script like so.

我的简单脚本是:

%Entry Point
clear all

N = 100;
x = randn(1,N);

figHandle = figure(1);
clf(figHandle);
set(figHandle, 'KeyPressFcn', myFunction(~, eventDat,x,N))

这是位于同一目录中的函数"myFunction":

Here is the function 'myFunction' that sits in the same directory:

function myFunction(~, eventDat,x,N)

    mean = sum(x)/N;
    disp(mean);
    key = eventDat.Key;
    disp(key);

end

现在，如果我运行此命令，它将不起作用，因为(我怀疑)我调用myFunction的方式出了点问题，但由于我是菜鸟，所以我无法弄清楚到底是什么问题使用KeyPressFcn.对于这个问题的帮助将不胜感激.谢谢！

Now, if I run this, it does not work, because, (I suspect), something is wrong with the way I am calling myFunction, but I cannot figure out what the problem is exactly, since I am a noob at using KeyPressFcn. Help would be appreciated for this problem. Thanks!

推荐答案

您需要通过匿名函数来做到这一点:

You need to do it through anonymous functions:

在脚本文件中，例如称为test.m:

In script file, for example called test.m:

%Entry Point
clear all

N = 100;
x = randn(1,N);

figHandle = figure(1);
clf(figHandle);
set(figHandle, 'KeyPressFcn', ...
    @(fig_obj , eventDat) myFunction(fig_obj, eventDat, x, N));

在与test.m相同的文件夹中的名为myFunction.m的文件中

In a file called myFunction.m in the same folder as test.m

function myFunction(~, eventDat, x, N)

    mean = sum(x)/N;
    disp(mean);
    key = eventDat.Key;
    disp(key);

---

如何从myFunction返回值?有几种方法可以执行此操作.这取决于你想做什么.但是很快您可以为此使用可变变量，例如containers.Map.这是对此的一个例子.返回的变量是newN.

---

How to return value from myFunction?There are few ways of doing this. It depends on what u want to do. But quickly you could use mutable variables for this, such as, containers.Map. This is one example of ding this. The returned variable is newN.

在脚本文件中，例如称为test.m:

In script file, for example called test.m:

%Entry Point
clear all

N = 100;
x = randn(1,N);

% this map will store everything u want to return from myFunction.
returnMap = containers.Map;

figHandle = figure(1);
clf(figHandle);
set(figHandle, 'KeyPressFcn', ...
    @(fig_obj , eventDat) myFunction(fig_obj, eventDat, x, N, returnMap));


% wait till gui finishes in this example.
waitfor(figHandle);

newN = returnMap('newN');

% display newN
newN

在名为myFunction.m的文件中:

function myFunction(handle, eventDat, x, N, returnMap)

    mean = sum(x)/N;
    disp(mean);
    key = eventDat.Key;
    disp(key);

    newN = 435;

    returnMap('newN') = newN;

这篇关于在一个简单的程序中使用MATLAB的'keyPressFcn的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！