How to assign a user input to a variable in matlab when using uicontrol 'string'?

Question

oshawcole 2017-9-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356431-how-to-assign-a-user-input-to-a-variable-in-matlab-when-using-uicontrol-string

评论： Stephen23 2017-9-13

uicontrol('Parent',d,...
               'Style','edit',...
               'Position',[20 330 210 60],...
               'String','-4')

The -4 is just an example value, and can be changed by the user. I want to store this string value in a variable. Please help.

Thank you in advance.

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Answer 1

Stephen23 2017-9-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/356431-how-to-assign-a-user-input-to-a-variable-in-matlab-when-using-uicontrol-string#answer_281343

编辑：Stephen23 2017-9-13

在 MATLAB Online 中打开

hnd = uicontrol('Parent',d,... 'Style','edit',... 'Position',[20 330 210 60],... 'String','-4');
str = get(hnd,'String')
num = str2double(str)

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oshawcole 2017-9-13

编辑：Stephen23 2017-9-13

在 MATLAB Online 中打开

heading = uicontrol('Parent',d,...
             'Style','text',...
             'Position',[20 310 210 100],...
             'String','Enter the first value:');
          txt = uicontrol('Parent',d,...
             'Style','edit',...
             'Position',[20 330 210 60],...
             'String',' -4');

This -4 is just an example value, like default answer in the dialog box. I want to extract the user input value and assign it to a variable. The user can use any number, as it is a user interactive code.

Stephen23 2017-9-13

在 MATLAB Online 中打开

"I want to extract the user input value and assign it to a variable. The user can use any number, as it is a user interactive code."

That is exactly what my code does. What you think this example shows?:

>> hnd = uicontrol('Style','edit'); % then I added '+3' by hand
>> get(hnd,'String')
ans = +3

Call get any time you want to check what the current string is. It is that simple. If you want a callback then add a callback (in which case you will also need get or the new dot syntax, whichever works for you).

Are you expecting MATLAB to magically update a variable any time the user changes the string in the edit box? This is possible, but it is quite a bit fiddlier than what I showed you in my answer, and it would be worth considering using nested functions. Have a look at my FEX submission iregexp for an example of how to do this:

https://www.mathworks.com/matlabcentral/fileexchange/48930-interactive-regular-expression-tool

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