I have a question about stopping a plot on matlab. I use given code to plot my trajectory.
But the case here is that, I have a drop-down menu and I'm trying to control my plot speed using drop-down( pop-up) menu.
Pop-up menu works as given below:
function animation_speed_Callback(hObject, eventdata, handles)
% hObject handle to threeDOF_animation_speed (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global plot_step
switch get(handles.animation_speed,'Value')
case 1
run('create_animation.m')
case 2
run('create_animation.m')
end
and here is the create_animation.m file :
if get(handles.animation_speed,'Value')==1
plot_step=5;
elseif get(handles.animation_speed,'Value')==2
plot_step=10;
end
for i = 1:plot_step:length(x)
addpoints(trajectory,y(i),x(i))
drawnow
hold on
end
The problem is when I select option '1' (plot_step=5) and then change it as '2' (plot_step=10) without waiting the finishing of the loop, it works like that:
It starts to plot my points with case 1 and then it turns to case 2. ( Everything is normal untill now.)
However, it continue to plot case 1. I do not want to see case 1 again.
How can I fix this?
(PS: I attached a gif file I select 2x at the beginning and then I select 8x. After it finish to plot 8x it starts to continue 2x again.)
Thanks in advance!
Related
I want to implement a gui enviroment in which when the user load two images it then select an arithematic operation to apply on these two images. I am stuck in this place. Just tell me what code I use in "Case" values to apply.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton3 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
contents = get(handles.popupmenu1,'String');
popupmenu4value = contents{get(handles.popupmenu1,'Value')};
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu1contents as cell array
% contents{get(hObject,'Value')} returns selected item from
popupmenu1
switch popupmenu4value
case 'Add'
%function of A
set(handles.figure1,'CurrentAxes',handles.axes3);
imshow(img2,[]);
case 'B'
%function of B
end
you can use uigetdir to get the path and name of the image you wish to load.
you will then need to perform your arithmetic operation on the loaded images before trying to display the modified image (be careful of pixel overflow if for example you are adding the images together - if you have two pixels at value 256 and add them together the result displayed will be 256 not 512 so you would need to use double then convert back to uint8).
without more information of what you want it isn't really possible to provide more help. if you are having trouble with matlab-guide then i suggest searching youtube for tutorials and going through the matlab guide tutorial. it will be much faster and more beneficial to you if you do this first before asking questions here. youtube - matlab guide
I have a question about how can I write a code to create a GUI in Matlab. I've created the graphic interface with a simple button. I want that, pressing that button, load a text file and after a loop, load an image and create the different bands (this process is because it's a multispectral image with different bands). This code works well if I execute on a .m file. This is the code:
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
Dates=load ('C:\Users\Desktop\dates.txt');
NombImages=load ('images.txt');
Nimages= numel(Dates);
fileimg=NombImages(1);
fileistr=int2str(fileimg);
image1 = imread(fileistr);
size=size(imagen1); nrows= size(1);
ncolumns= size(2);
nbands= size(3);
Images = zeros(nrows, ncolumns, nbands, Mimages, 'uint16');
imagess = zeros(nrows, ncolumns, nbands);
for image= 1: Nimages
fileimg=NombImagen(image);
fileistr=int2str(fileimg);
imagess = imread(fileistr);
Images(:,:,:,image)=imagess;
end
DN= double(Images);
Band1 = Images(:,:,1);
Band2 = Images(:,:,2);
Band3 = Images(:,:,3);
end
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
Maybe it seems a bit complicated but it's because of the format of the images (16 bits, etc.). I don't want to visualize the bands, only load it with that code.
Any help would be appreciated. Thanks in advance,
here we go:
you recieve an error-message, which indicates, that there is an "end" at the end of your function (the pushbutton-callback-fcn).
In Matlab it is possible to end functions without ending them with an end :)
When using GUIDE for example, this is the default. GUIDE creates functions without ending them with "end".
So the problem is: if you put an "end"-statement somwhere to end a function, Matlab is expecting an end after EVERY function!!
In your special case:
remove the "end" at the end of your code:
...
Band1 = Images(:,:,1);
Band2 = Images(:,:,2);
Band3 = Images(:,:,3);
end%<-this one :)
Another option of course is, to an end after every function...
edit
to store data within a GUI you can (or should) use the handles-structure. How to use it in detail is explained here:
TMW: guidata
A short version:
store data within the handles-structure like this:
handles.myVar = ...
and dont forget to update the structure by this command:
guidata(hObject,handles)
For you it should look like:
handles.Band1=Band1; %or directly: ...=Images(:,:,1);
...
guidata(hObject,handles)
and later on you can retrieve the data within another function (that knows about the handles-structure of course!) just like this:
handles.Band1
So far, just say that I have a GUI and list of uicontrol in it with 1 push button that start the computation process. In the push button, the callback function look like this :
% --- Executes on button press in mulai.
function mulai_Callback(hObject, eventdata, handles)
% hObject handle to mulai (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%--give the program "Working" status
set(handles.status,'String','Working');
%--empty some edit text
set(handles.misklasifikasi,'String','');
set(handles.nilaiakurasi,'String','');
set(handles.nilaiwaktu,'String','');
%--Some computation process
%--Giving the result
set(handles.misklasifikasi,'String',misklasifikasi);
set(handles.nilaiakurasi,'String',sprintf('%g%% ',akurasi));
set(handles.nilaiwaktu,'String',sprintf('%g detik ',waktu));
%--give the program ready status
set(handles.status,'String','Ready');
but when I try it the program like just do the command after the computation process, did I missed something???
Thanks in advance...
Try to put a drawnow just before you start the computation. This will force MATLAB to flush the GUI event queue. You want to also place another call at the end of the callback function.
i'm in seek of information.
Me and a other students like me have to create sound in Matlab. We create them, and we have to create also an interactif interface to play those sound.
So we create a piano, and when we click on a key, it's play the sound ( that is the function. )
We also wanted that we can push a key on the Keyboard that call the function. We heard about KeyPressFCN, but we don't know how to use it, because when we search every tutorial, they didn't give enough information about it.
So, when we rightclick on the element we want, and them we call KeyPressFCN, what is the next step ? What did we have to do to "put" the function on this KeyPressFCN.
For example, to make one of the sound, we have :
% --- Execution lors d'un appui sur le bouton Do (première blanche)
function pushbutton1_Callback(hObject, eventdata, handles)
octave = str2double(get(handles.zone1,'String'));
frequence = 2093; %--- Fréquence initialement Do6
frequence2 = frequence./ octave;
son = sin(2*pi*frequence2*(0:0.000125:0.2));
sound(son);
Actually I am just quoting Matlab docs and help.
If you are using GUIDE right click on your figure (not on any object) >> View Callbacks >> KeyPressFcn, then it will auto-generate the following function:
function figure1_KeyPressFcn(hObject, eventdata, handles)
% hObject handle to figure1 (see GCBO)
% eventdata structure with the following fields (see FIGURE)
% Key: name of the key that was pressed, in lower case
% Character: character interpretation of the key(s) that was pressed
% Modifier: name(s) of the modifier key(s) (i.e., control, shift) pressed
% handles structure with handles and user data (see GUIDATA)
% add this part as an experiment and see what happens!
eventdata % Let's see the KeyPress event data
disp(eventdata.Key) % Let's display the key, for fun!
Play around with your keyboard and see the eventdata. Obviously the figure must be active when you are typing.
If you are using the uicontrol (and not GUIDE) which is the programmatic way of making gui
(using Inline function)
fig_h = figure; % Open the figure and put the figure handle in fig_h
set(fig_h,'KeyPressFcn',#(fig_obj,eventDat) disp(['You just pressed: ' eventDat.Key]));
% or again use the whole eventDat.Character or eventDat.Modifier if you want.
Or if you do not want to use inline function:
fig_h = figure;
set(fig_h,'KeyPressFcn', #key_pressed_fcn);
and then define your key_pressed_fcn like: (create a new mfile with name: key_pressed_fcn.m, of course you could use whatever name you want but the same as KeyPressFcn name above)
function key_pressed_fcn(fig_obj,eventDat)
get(fig_obj, 'CurrentKey')
get(fig_obj, 'CurrentCharacter')
get(fig_obj, 'CurrentModifier')
% or
disp(eventDat)
OR! use a script as your KeyPressFcn callback function
fig_h = figure;
set(fig_h,'KeyPressFcn', 'key_pressed');
and then write key_pressed script:
get(fig_h, 'CurrentKey')
get(fig_h, 'CurrentCharacter')
get(fig_h, 'CurrentModifier')
For Matlab help refer to "KeyPressFcn Event Structure" in:
http://www.mathworks.com/help/matlab/ref/figure_props.html
I've written a Matlab script that reads in data using a virtual COMM port in real-time. I've done a significant amount of signal processing in an mfile.
Next, I felt the need to have a compact GUI that displays the information as summary.
I only recently started digging and reading more of Matlab's built-in GUI tool, GUIDE. I've followed a few tutorials and am successfully able to get my graphs to display on my GUI after a button-press.
However, I want the GUI to update in real-time. My data vector is constantly updating (reading in data from the COMM port). I want the GUI to keep updating the graphs with the newer data, as opposed to relying on a button press for an update. Can someone please point me in the right direction for background updating?
Here is the relevant code currently for the GUI:
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global data
global time
% Time domain plot
axes(handles.timeDomainPlot);
cla;
plot (time, data);
EDIT Changed code:
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%Setting it to display something when it ends
% t = timer('TimerFcn', 'timerOn=false; disp(''Updating GUI!'')',...
t = timer(...
'TasksToExecute', 10, ... % Number of times to run the timer object
'Period', 3, ...
'TimerFcn', GUIUpdate());
%Starting the timer
start(t)
function GUIUpdate()
global data
global time
%Parameters below axes
global min
global max
% Time domain plot
axes(handles.timeDomainPlot);
cla;
plot (time, data);
%Other parameters:
set(handles.mean, 'String', mean);
set(handles.max, 'String', max);
The error that I get is:
??? Error using ==> GUI_Learning>GUIUpdate
Too many output arguments.
Error in ==>
#(hObject,eventdata)GUI_Learning('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback
Here is an example using a timer with a timerFcn callback. I made a simple GUI with 1 axes and 1 button.
In the opening function I initialize the plot and create the timer. In the start button callback I start the timer and start manipulating the data. The timer function callback the just updates the y-data of the line via its handle. Below are the relevant functions from the GUI's M-file (snipped init section and output fcn.
function testTimer_OpeningFcn(hObject, eventdata, handles, varargin)
global y x
x = 0:.1:3*pi; % Make up some data and plot
y = sin(x);
handles.plot = plot(handles.axes1,x,y);
handles.timer = timer('ExecutionMode','fixedRate',...
'Period', 0.5,...
'TimerFcn', {#GUIUpdate,handles});
handles.output = hObject;
guidata(hObject, handles);
% --- Executes on button press in startButton.
function startButton_Callback(hObject, eventdata, handles)
global y x
start(handles.timer)
for i =1:30
y = sin(x+i/10);
pause(1)
end
function GUIUpdate(obj,event,handles)
global y
set(handles.plot,'ydata',y);
You may want a Stop button to stop the timer depending on how your GUI is structured and were/how the data is updated.
Edit: Basic handles info some of this is pretty basic and you may already know it:
An individual handle to an object contains a bunch of properties that you can read with the get() function or set with the set() function. So for example maybe I wanted to change the text of the startButton for some reason in my GUI.
set(handles.startButton,'String','Something Other Than Start');
You may just want to set a break point in your code somewhere (maybe in a button press) and play around with the handles struct. Running get() commands on various objects to learn their properties.
Now the handles structure contains all of the ... umm... handles to your GUI's objects as well as any custom items that may be convenient for your to store there. Most GUI callbacks automatically get passed the handles struct so you have easy access to all parts of the GUI.
Ex. The 'startButton' callback was automatically passed handles. So I had easy access to the timer object via handles.timer.
Which brings me to sticking custom things into handles. In the opening function I added a new item to the handles structure handles.timer and handles.plot because I knew they would be useful in other callbacks (like button press and the timerFcn callback).
However, to store these things permanently you need to use the 'guidata' function. This function basically either stores the modified handles struct or retrieves a copy of handles depending on how you call it. So the following line in the opening function is storing the modified handles structure (added .timer and .plot) into the main GUI.
guidata(hObject,handles);
Basically any time you add something in handles you should have that line to make the change permanent.
Now the other method of calling it is:
handles = guidata(hObject); %hObject can be any handle who is a child of the main GUI.
This will retrieve the handles structure for the GUI.
And last handles.output = hObject is just the default output when you launch your GUI. IF you call your GUI via Matlab's command line like this h = myGUI; it should return the handle to your GUI.
You need to use a timer object. Set the callback to be the function that updates the plots.
Take a look at Making Graphs Responsive with Data Linking
and the linkdata command.
If the same variable appears in plots in multiple figures, you can
link any of the plots to the variable. You can use linked plots in
concert with Marking Up Graphs with Data Brushing, but also on their
own. Linking plots lets you
Make graphs respond to changes in variables in the base workspace or within a function
Make graphs respond when you change variables in the Variable Editor and Command Line
Modify variables through data brushing that affect different graphical representations of them at once
Create graphical "watch windows" for debugging purposes
Watch windows are useful if you program in the MATLAB language. For
example, when refining a data processing algorithm to step through
your code, you can see graphs respond to changes in variables as a
function executes statements.
I made a quick and dirty test seen below and I am not sure how this will work in a GUI verses a function but may do the trick.
Note 1: I had to add a break point in my subroutine where it modifies the global y to actually see the plot auto-update. You may need some combination of drawnow, pause, or a timer if data is getting changed rapidly.
function testLinking()
global x y
%Links failed if the global did not also exist in the base workspace
evalin('base','global x y');
x = 0:.1:3*pi; % Make up some data and plot
y = sin(x);
h = plot(x,y,'ydatasource','y','xdatasource','x');
linkdata on
testSub
function testSub()
%Test to see if a sub can make a linked global refresh
global x y
for i = 1:10
%This should automatically update the plot.
y = sin(x+i/10);
end
Edit: there may be ways around the use of globals depending on how your functions are structured ... but I don't have time to dig into it to much.
You can add a callback on the serial object that executes a plotting function. You must attach the callback to the 'BytesAvailableFcn' event on the object (see this for more details on the properties of the com object).
Essentially, when there are bytes available on the com port, you instruct matlab to run a specific function. In your case, it will be the function updating the GUI. If you need to process the incoming data first, then your callback function will first do the signal processing and then do the plotting commands.