How to assign a user input to a variable in matlab when using uicontrol 'string'?
显示 更早的评论
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.
采纳的回答
hnd = uicontrol('Parent',d,... 'Style','edit',... 'Position',[20 330 210 60],... 'String','-4');
str = get(hnd,'String')
num = str2double(str)
4 个评论
oshawcole
2017-9-13
Stephen23
2017-9-13
"It should not always give me -4"
It does not always give you -4. It gives you whatever the string in the edit box is. Have a look at str.
"For example if the user wants to give -7 as input, so num= -7"
It works for me, did you try it?
>> hnd = uicontrol('Style','edit'); % then I added '-7' by hand
>> get(hnd,'String')
ans = -7
>>
What do you expect to happen?
Note that by default MATLAB uicontrols do not trigger any action, so the simplest way of updating a variable based on any uicontrol value (e.g. the string) is to get that value just as I showed you in my answer. If you want the uicontrol to trigger some callback then you will have specify one of its callback methods:
or add some listener to your gui:
Stephen23
2017-9-13
"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:
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 App Building 的更多信息
Translated by 
