Error using axes. Invalid object handle.

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Tanatos Daniel
Tanatos Daniel 2014-9-21
评论： Bachtiar Muhammad Lubis 2019-2-6
I created a matlab GUI with togglebutton1 and axes1. I would like to push the button and view the -signal plotted in axes1. Here is my code. I tried to make it as small as I could in order to expose the problem.
function varargout = untitled3(varargin)
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @untitled3_OpeningFcn, ...
'gui_OutputFcn', @untitled3_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
function untitled3_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
global buttonState
buttonState=1;
global Fs
global T
global recObj
global i
global sig
global r
Fs = 8000; %# sampling frequency in Hz
T = 0.03; %# length of one interval signal in sec
%# prepare audio recording
recObj = audiorecorder(Fs,8,1);
i=1;
while (buttonState)
recordblocking(recObj, T);
sig = getaudiodata(recObj);
r=xcorr(sig,'coeff');
axes(handles.axes1);
subplot(3,1,3);
plot(r);
legend('Autocorrelation');
xlabel('Delay (s)');
ylabel('Correlation coeff.');
drawnow %# force MATLAB to flush any queued displays
i=i+1;
end
function varargout = untitled3_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
function togglebutton1_Callback(hObject, eventdata, handles)
isPushed=get(hObject,'Value');
if isPushed
i=1;
buttonState=0;
set (hObject, 'String', 'Stop');
else
buttonState=1;
set (hObject, 'String', 'Start');
end
It almost does that, but when I press exit, I get the error on line 46.
  1 个评论
Jan
Jan 2014-9-21
Please do not let us guess, which of the lines is the line 46. And post a copy of the complete error message.

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回答（1 个）

Jan
Jan 2014-9-21
编辑：Jan 2014-9-21
Using the debugger is the standard for solving such problems. Type in the command window:
dbstop if error
Then run the code again until the error appears. Now you can inspect the locally used variables, I guess the handles struct is the problem and handles.axes1 does not contain a valid axes -handle.
  1 个评论
Bachtiar Muhammad Lubis
Bachtiar Muhammad Lubis 2019-2-6
@Jan : How could a handles.axes doesn't contain a valid axes handle sir ? i am facing this error now

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