Gui Guide Timer Stop and Start

Hi,

I have a gui which reads in data from a binary file and then plots it. I created a timer which should read the binary file and then updates the plot, however I run into an error when I would like to stop the timer and the updating. {Matrix dimensions must agree}. Starting the timer does not give an error

% --- Executes on button press in Start_Button.
function Start_Button_Callback(hObject, eventdata, handles)

t = handles.timer;
disp(t.Running);
if get(t, 'Running') == 'off'
    start(handles.timer);
elseif get(t, 'Running') == 'on'
    disp('xfdgh');
    stop(handles.timer);
end
pause(0.5)

function GUIUpdate(obj,event,handles)
global x y1 y2

Window_buffer_Matrix = read_bin_file(Rows_in_database, ...
    Dynamic_Database_buffer_size); % a function that reads in the data into a matrix
[~, cols_of_data] = size(Window_buffer_Matrix);

if cols_of_data > 0 && x(1,1) ~= Window_buffer_Matrix(1,1)

    x = Window_buffer_Matrix(1,1:cols_of_data); % the x axis data
    y1 = Window_buffer_Matrix(2,1:cols_of_data); % plotting two sets of data on one axis
    y2 = Window_buffer_Matrix(2 + i,1:cols_of_data);
         
    handles.plot = plot(handles.axes1,x,y1, 'b',...
        1 + x, y2, '-.r'); % y2 is the forecasted values of y1, hence x + 1
    end
end

function gui_OpeningFcn(hObject, eventdata, handles, varargin)

global y1 y2 x

x = 0;
y1 = 0;
y2 = 0;

handles.plot = plot(handles.axes1,x,y1, 'b',...
                                1 + x, y2, '-.r');
axes(handles.axes1);
ylabel('VRMS [pu]');
xlabel('Time step');
ylim([0.95 1.05]);

legend('Actual','Predicted')
title('Voltage Magnitude');
grid on;

handles.timer = timer('ExecutionMode','fixedRate',...
                    'Period', 0.5,...
                    'TimerFcn', {@GUIUpdate,handles});
handles.output = hObject;
guidata(hObject, handles);

[Geoff Hayes]

Septimus - do you know which line of code correspods to the error? It is in the GUIUpdate callback function? Or is it at some other line?

[Septimus Boshoff]

It was this line -

get(t, 'Running') == 'off'

Answer 1

[Septimus Boshoff]

I found the solution!

function Start_Button_Callback(hObject, eventdata, handles)

tick_tock = handles.timer;
run = tick_tock.Running;

if strcmp(run,'off')
    disp('Timer Started');
    start(handles.timer);
    set(handles.Start_Button,'string','Stop');
elseif strcmp(run,'on')
    disp('Timer Stopped');
    stop(handles.timer);
    set(handles.Start_Button,'string','Start');
end

pause(0.5)