Help with error code for my GUI

Stephen Hawkins

2014 4 10

0 个回答

5 次查看（30 天）

0 个投票

I'm currently creating a GUI that is able to graph a user defined function. You are also able to find the zero value at a point by clicking a button that that then activates ginput. The code for this is below.

if true
  % code
[x,y]=ginput(1);
fct=@(x) get(handles.funct,'String');
zero=num2str(fzero(fct,x));
set(handles.edit8,'String',zero);
guidata(hObject,handles)
end

In this code handles.funct is the user defined function, and handles.edit8 is a edit box where the answer will be output. Now when i run this program for a function such as 'cos(x)' i get the following error code as well as the edit box displaying NaN

if true
  % code
Operands to the || and && operators must be
convertible to logical scalar values.
Error in fzero (line 308)
  elseif ~isfinite(fx) || ~isreal(fx)
Error in Matlabfinalproject>findzero_Callback (line
186)
zero=num2str(fzero(fct,x));
Error in gui_mainfcn (line 96)
      feval(varargin{:});
Error in Matlabfinalproject (line 44)
  gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)Matlabfinalproject('findzero_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
end