Matlab回调函数只有一个参数传递给它

问题描述

我在Matlab中编程我的第一个GUI。我已经构建了GUI的视觉方面，我现在正在编写回调函数的过程。当我写回调函数，我需要传递两个句柄，但由于某种原因只有一个句柄传递给函数。我相信这是一个基本的问题，但我真的很难过去，我在文档中找不到任何原因，为什么这不工作

I'm writing my first GUI programmatically in Matlab. I have built the visual aspect of the GUI and I am now in the process of writing the Callback functions. When I write the callback function I need to pass two handles to it, but for some reason only one of the handles is passed to the function. I'm sure this is really quite a basic question but I am really struggling to get past this, and I can't find any reason in the documentation why this wouldn't work

回调是针对一个按钮，需要两个用户输入的参数，然后使用这些数字构建一个传递函数。这两个参数被输入到可编辑的文本框中，带有句柄orderEdit和timeConstEdit。我可以提取我需要的字符串，然后将其转换为数字数据格式。代码如下

The callback is for a button and takes two user inputted parameters, and then uses these numbers to build a transfer function. The two parameters are entered into editable text boxes, with handles orderEdit and timeConstEdit. I can extract the string which I need and then convert it to an numeric data format. The code is as follows

首先我将回调标志设置为按钮rtdButton

First I set the callback flag to the button rtdButton

set( rtdButton, 'Callback', @rtdPlot );

回调函数的前两行如下（其余的函数应该工作一次可以得到这些值）：

The first two lines of the callback function are as follows (the rest of the function should work once I can get these values):

function rtdPlot(orderEdit,timeConstEdit)
    n = str2num(get( orderEdit, 'String' ));
    tau = str2num(get( timeConstEdit, 'String' ));

但是我收到错误

??? Error using ==> str2num at 33
Requires string or character array input.

Error in ==> mixingModel>rtdPlot at 148
         tau = str2num(get( timeConstEdit, 'String' ));

??? Error while evaluating uicontrol Callback

任何有关如何执行此操作的帮助将非常感谢

Any help on how to do this would be greatly appreciated

编辑：基于Bee的帖子，正确的代码如下：

Based on Bee's post the correct code is as follows:

set（rtdButton，'Callback'，{@rtdPlot，

set( rtdButton, 'Callback', {@rtdPlot,orderEdit, timeConstEdit} );

    function rtdPlot(src,eventdata,arg1,arg2)
        n = str2num(get( orderEdit, 'String' ));
        tau = str2num(get( timeConstEdit, 'String' ));

干杯
John

CheersJohn

推荐答案

从Matlab文档：

function myCallback（src，eventdata，arg1，arg2）当使用额外的
参数作为回调函数时，将
属性的值设置为单元格数组（即，用大括号括起函数句柄和
参数）：

function myCallback(src,eventdata,arg1,arg2) When using additional arguments for the callback function, you must set the value of the property to a cell array (i.e., enclose the function handle and arguments in curly braces):

WindowButtonDownFcn'，{@ myCallback，arg1，arg2}）

figure('WindowButtonDownFcn',{@myCallback,arg1,arg2})

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