Make an iucontrol edit box into a number able to be done math on.

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Philosophaie 2016-4-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281636-make-an-iucontrol-edit-box-into-a-number-able-to-be-done-math-on

评论： Adam 2016-4-29

"lat" should be a double and should be able to be subtracted from 90. How do I make "lat" a double and able to be done math on?

lat = uicontrol('Style','edit','String','0','position',[250 630 100 20],'Callback',(@h_lat));
  uicontrol('Style','pushbutton','String','Evaluate','Position',[130,550,100,50],'Callback',{@Evaluate},'BackgroundColor','green');
  function h_lat(hObject, eventdata, handles)%#ok
      lat = str2double(get(hObject,'String'));
      handles = guidata(hObject);
      guidata(hObject, setfield(handles,'lat',lat));%#ok
    function Evaluate(hObject, eventdata, handles)
        handles = guidata(hObject);
        lat = handles.lat;
        disp(lat);
        Theta=(90-lat)*pi/180;

Output:

UIControl (0) with properties:
                Style: 'edit'
               String: '0'
      BackgroundColor: [0.9400 0.9400 0.9400]
             Callback: @h_lat
                Value: 0
             Position: [250 630 100 20]
                Units: 'pixels'
    Show all properties
Undefined function 'minus' for input arguments of type 'matlab.ui.control.UIControl'.
Error in MagneticFieldFromLonLat>Evaluate (line 64)
    Theta=(90-lat)*pi/180;
Error while evaluating UIControl Callback