GUI use inputs as min and max for a function question? - Homework

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Nora
Nora 2013-11-29
评论： Image Analyst 2013-12-3
I am making a GUI where it plots the cos(x) in the range of [0 10]. However, there are two open textboxes that can be changed by the user to create a new min and max range for cos(x). If the user changes these two numbers, the cos(x) plot should update accordingly.
Here is my script so far:
function varargout = costext(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @costext_OpeningFcn, ...
'gui_OutputFcn', @costext_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before costext is made visible.
function costext_OpeningFcn(hObject, eventdata, handles, varargin)
% Choose default command line output for costext
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes costext wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = costext_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
fplot('cos', [0, 1]);
xlabel('x');
ylabel('cos(x)');
function edit3_Callback(hObject, eventdata, handles)
function edit3_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function edit4_Callback(hObject, eventdata, handles)
% --- Executes during object creation, after setting all properties.
function edit4_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
This works only to show the cos(x) function from [0 10] using fplot, but how can I change the MIN and MAX for what the user inputs and changes the graph???

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回答（2 个）

Image Analyst
Image Analyst 2013-11-29
编辑：Image Analyst 2013-11-29
Try xlim() and ylim().
Nora
Nora 2013-11-30
Referencing
fplot('cos', [0, 1]);
I am only changing the x values [XMIN XMAX] by the user. I was wondering how I can have the user input adjust the graph accordingly by changing the text on the GUI?
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Nora
Nora 2013-12-3
I tried to change the MIN and MAX and I got this update.
Error using feval
Undefined function 'edit2_Callback' for
input arguments of type 'struct'.
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in costext (line 17)
gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)costext('edit2_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Error using feval
Undefined function 'btnUpdate_Callback' for
input arguments of type 'struct'.
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in costext (line 17)
gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)costext('btnUpdate_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Error using feval
Undefined function 'edit2_Callback' for
input arguments of type 'struct'.
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in costext (line 17)
gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)costext('edit2_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
Also, I am trying to do this without using an update button, and just have the MIN and MAX change when the user presses enter.
???
Image Analyst
Image Analyst 2013-12-3
Then you need to create callbacks for the edit boxes and put a call to UpdatePlot() in there. The disadvantage of doing that is that the user will have to know that it won't know when they're done typing in a number into the edit field and that nothing will happen until that edit field loses focus. So they need to click away , such as in the other edit field or on a button or on some other control. And if they're going to have to click someplace outside the edit field anyway , then why not just make it obvious with an "Update plot" button?

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