Problem with axes in GUI

(sorry for my English)

I have problem with axes in my GUI. When I ran it for the first time - everything is OK, but for the second time (I want to plot some other data in the same axes) it throws error.

Reference to non-existent field 'axes2'.

Error in gui2>detekce_sweepy_5_progui (line 183) axes(handles.axes2);

My part of code:

handles = guihandles();

axes(handles.axes2);

plot(h);

So I donť know how to fix it... Thanks for advices!

[Jan]

We do not see enough code for an educated guess of the underlying problem. Please use the debugger to find out more details.

[Ondrej]

Here is part of code (but I'm not sure, if you want to go through whole code, cause that I post only small part..but I think that here is everything you need). I use some other functions, but that doesn't work with "gui", "axes" and "handles" parts...

function varargout = gui2(varargin)
  % GUI2 MATLAB code for gui2.fig
  %      GUI2, by itself, creates a new GUI2 or raises the existing
  %      singleton*.
  %
  %      H = GUI2 returns the handle to a new GUI2 or the handle to
  %      the existing singleton*.
  %
  %      GUI2('CALLBACK',hObject,eventData,handles,...) calls the local
  %      function named CALLBACK in GUI2.M with the given input arguments.
  %
  %      GUI2('Property','Value',...) creates a new GUI2 or raises the
  %      existing singleton*.  Starting from the left, property value pairs are
  %      applied to the GUI before gui2_OpeningFcn gets called.  An
  %      unrecognized property name or invalid value makes property application
  %      stop.  All inputs are passed to gui2_OpeningFcn via varargin.
  %
  %      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
  %      instance to run (singleton)".
  %
  % See also: GUIDE, GUIDATA, GUIHANDLES

    % Edit the above text to modify the response to help gui2

    % Last Modified by GUIDE v2.5 13-Jan-2014 13:50:20
    % Begin initialization code - DO NOT EDIT
    gui_Singleton = 1;
    gui_State = struct('gui_Name',       mfilename, ...
                       'gui_Singleton',  gui_Singleton, ...
                       'gui_OpeningFcn', @gui2_OpeningFcn, ...
                       'gui_OutputFcn',  @gui2_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 gui2 is made visible.
    function gui2_OpeningFcn(hObject, eventdata, handles, varargin)
    % This function has no output args, see OutputFcn.
    % hObject    handle to figure
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    % varargin   command line arguments to gui2 (see VARARGIN)

    % Choose default command line output for gui2
    handles.output = hObject;

    % Update handles structure
    guidata(hObject, handles);

    % UIWAIT makes gui2 wait for user response (see UIRESUME)
    % uiwait(handles.figure1);

    % --- Outputs from this function are returned to the command line.
    function varargout = gui2_OutputFcn(hObject, eventdata, handles) 
    % varargout  cell array for returning output args (see VARARGOUT);
    % hObject    handle to figure
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)

    % Get default command line output from handles structure
    varargout{1} = handles.output;

    % --- Executes on button press in load1.
    function load1_Callback(hObject, eventdata, handles)
    % hObject    handle to load1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    global a
    global fs
    global namereny_signal
    [nazev1 path1] = uigetfile({'*.wav'},'File Selector');
    full_path1 = strcat(path1, nazev1);
    [namereny_signal fs] = audioread(full_path1);
    set(handles.text1, 'String', nazev1)
    if (a==0)
    set(handles.analyze1, 'Enable', 'on')
    end
    a=0;

    function load2_Callback(hObject, eventdata, handles)
    % hObject    handle to load2 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    global a
    global mersig
    global fs
    [nazev2 path2] = uigetfile({'*.wav'},'File Selector');
    full_path2 = strcat(path2, nazev2);
    [mersig fs] = audioread(full_path2);
    set(handles.text2, 'String', nazev2)
    if (a==0)
    set(handles.analyze1, 'Enable', 'on')
    end
    a=0;

    % --- Executes on button press in analyze1.
    function analyze1_Callback(hObject, eventdata, handles)
    % hObject    handle to analyze1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    global namereny_signal
    global mersig
    if get(handles.f_1, 'Value')==1
        f1=str2num(get(handles.f_1t, 'String'));
    else
        f1=0;
    end
    if get(handles.f_2, 'Value')==1
        f2=str2num(get(handles.f_2t, 'String'));
        else
        f2=0;
    end
    if get(handles.f_3, 'Value')==1
        f3=str2num(get(handles.f_3t, 'String'));
        else
        f3=0;
    end
    if get(handles.f_4, 'Value')==1
        f4=str2num(get(handles.f_4t, 'String'));
        else
        f4=0;
    end
    if get(handles.f_5, 'Value')==1
        f5=str2num(get(handles.f_5t, 'String'));
        else
        f5=0;
    end
    if get(handles.f_6, 'Value')==1
        f6=str2num(get(handles.f_6t, 'String'));
        else
        f6=0;
    end
    if get(handles.f_7, 'Value')==1
        f7=str2num(get(handles.f_7t, 'String'));
        else
        f7=0;
    end
    switch get(get(handles.uipanel2,'SelectedObject'),'Tag');
        case 'button5', 
            switch get(get(handles.uipanel1,'SelectedObject'),'Tag');
                case 'sweep_button', detekce_sweepy_5_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'sum_button', detekce_smessin_5_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'smessin_button', detekce_smessin_5_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'mls_button', detekce_mls_5_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
            end
      case 'button15',  
            switch get(get(handles.uipanel1,'SelectedObject'),'Tag');
                case 'sweep_button', detekce_sweepy_15_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'sum_button',  detekce_smessin_15_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'smessin_button',  detekce_smessin_15_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
                case 'mls_button', detekce_mls_15_progui (namereny_signal, mersig, f1, f2, f3, f4, f5, f6, f7)
            end
    end

    function [data] = detekce_sweepy_5_progui (v2, v, varargin)
    global p;
    fs=44100;
    ss = zarovnani_signalu2(v,v2); %srovnaný signál
    data=zeros(73,nargin-2);
    start=6;
    i=1;
    legenda(1:7)=0;
    while i<74
        h = sinesweeps_response1(ss(start*fs:(start+2)*fs,1), fs, 100, 0.4);
        if i==1
            % handles = guihandles();
            axes(handles.axes2);
            plot(h); title('Zazoomujte v impuslni odezve tak, aby byl videt i první odraz - potvrdte stisknutim Enter.');
            zoom on;
            waitfor(gcf,'CurrentCharacter',13)
            zoom reset
            zoom off
            title('Kliknete pred prvni odraz.');
            [x_coord]=ginput(1); 
        end
        four=abs(fft(h(1:round(x_coord),1),fs));
        fr=mag2db(abs(four(2:fs/2)));
        axes(handles.axes3);
        semilogx(fr)
        title('Frekvenční charakteristika před korekcí');
        y=1;
        for k=1:nargin-2
            if varargin{k} ~= 0 %pokud je nezatrhnutá frekvence
                data(i,y)=fr(varargin{k});
                legenda(y)=varargin{k};
                y=y+1;            
            end
        end
        i=i+1;
        start=start+4; 
    end
    %%korekce fr
    load('ir_6010A.mat')
    four=abs(fft(ir_6010A,fs));
    fr_z=mag2db(abs(four(2:fs/2)));
    axes(handles.axes4);
    semilogx(fr+fr_z);
    title('Frekvenční charakteristika po korekci');
    y=1;
    for k=1:nargin-2
        if varargin{k} ~= 0 %pokud je nezatrhnutá frekvence
            data(:,y)=data(:,y)+fr_z(varargin{k});
            y=y+1;            
        end
    end

    %%vykresleni
    teta=[-180 -175 -170 -165 -160 -155 -150 -145 -140 -135 -130 -125 -120 -115 -110 -105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180];
    romin=min(min(data));
    romax=max(max(data));
    barvy=['k' 'b' 'r' 'm' 'g' 'c' 'y'];
    % handles = guihandles();
    axes(handles.axes1);
    for k=1:(y-1)
        p(k)=Dirplot(teta,(data(:,k))','-r',[romax romin 1]);
        hold on
        set(p(k),'color',barvy(k),'linewidth',2)
    end
    legg=legend(strcat(num2str(legenda(1)), ' Hz'),strcat(num2str(legenda(2)), ' Hz'),strcat(num2str(legenda(3)), ' Hz'),strcat(num2str(legenda(4)), ' Hz'),strcat(num2str(legenda(5)), ' Hz'),strcat(num2str(legenda(6)), ' Hz'),strcat(num2str(legenda(7)), ' Hz'));
    set(legg,'Location','NorthEastOutside')
    title('Směrová charakteristika mikrofonu s krokem 5°');
    hold off

Answer 1

[Amit]

You will not get this issue if you remove handles = guihandles();

handles structure is available to all functions. in the section where you are trying this, axes(handles.axes2) will work without calling handles = guihandles().

Try simply

% handles = guihandles()
  axes(handles.axes2);
  plot(h);

I am not completely sure why axes2 gets removed from the handles structure after you execute the code the way you have done.

[Ondrej]

If I remove that, i get another problem.

Undefined variable "handles" or class "handles.axes2".

[Amit]

Post the whole GUI code.

[Amit]

try passing handles in the function

function [data] = detekce_sweepy_5_progui(handles, v2, v, varargin)

handles is not defined for the function detekce_sweepy_5_progui, so you need to pass it as a variable.

Which also means, that you have to add 'handles' as the first variable every location you have used this function detekce_sweepy_5_progui

[Ondrej]

It works! Thank you so much! :)

[abhishek m]

im2=imread('sk.png'); bw = im2; bw = sum((1-im2).^2, 3) > .5; %bw = min( bw, [], 3 ) < 50 ; % dark pixels - intensity lower than 50 [y x] = find( bw ); % note that find returns row-col coordinates.

mx = mean(x); my = mean(y); C = [ mean( (x-mx).^2 ), mean( (x-mx).*(y-my) );... mean( (x-mx).*(y-my) ) mean( (y-my).^2 ) ]; [V D] = eig( C );

quiver( mx([1 1]), my([1 1]), (V(1,:)*D), (V(2,:)*D), .05 ); [~,mxi] = max(diag(D)); % find major axis index: largest eigen-value or = atan2( V(2,mxi), V(1,mxi) ) * 180/pi ; % convert to degrees for readability rotate = imrotate( im2, or-90 );

handles = guihandles();

axes(handles.axes2);

imshow( rotate );

set(handles.text3, 'String',or-180);

i am getting error in axes like "Reference to non-existent field 'axes2'" how to fix it>