I'm looking for an easy way too save the current state of my GUI and be able to load this saved state again. I know there is a video for this (http://blogs.mathworks.com/videos/2010/12/10/how-to-save-and-restore-state-of-a-gui-in-matlab/) but somehow it doesn't work on my computer.
I thought of something like this: (I used gcf because I didn't know the "mainhandle" for my entire GUI)
%Save Data
currentdata = getappdata(gcf);
uisave('currentdata',date);
%Load Data
[filename,pathname]=uigetfile({'*.mat'},'Select input file');
load([pathname,filename]);
The problem with this way is, that the saved Data is opened in a new figure and not the current one from which I chose to open it.
I was also wondering if it is possible to set a folder(which is added to the matlab path) as the deault folder for saving/loading.
Thank you for your help! Klaus
Since your currentdata keeps the whole handles of your GUI, including the handle to the GUI's main figure, so when you load it, there will be a new figure opened.
What one did in the mentioned video is: just save the fields/data that you need to be remained/reloaded in later session.
So either you save these specific fields in the GUI's handles and reload them one by one, or you can use the exchange functions mentioned in the comment under the video.
Related
I am working with this example from MathWorks: https://www.mathworks.com/help/supportpkg/plutoradio/examples/qpsk-transmitter-with-adalm-pluto-radio-1.html
When i run the example it creates an sdrqpsktx variable in the matlab workspace
I want to change sdrqpsktx.MessageBits to something smaller.
When i run the following code in matlab:
a = sdrqpsktx.MessageBits(1:448);
sdrqpsktx.MessageBits = a;
I successfully change sdrqpsktx.MessageBits to a.
However when i run this in simulink sdrqpsktx.MessageBits changes back to its original size.
How do i permanently change sdrqpsktx.MessageBits and run the example with my changes?
Thank you.
There is a model callback, probably a StartFcn, that is overwriting your changes to the variable every time you start the simulation. You either need to delete or modify that code.
To see the code go to:
File->Model Properties->Model Properties, and select the Callback tab.
Any callback that is followed by a * has code in it. Click on that callback to see the code.
See Callbacks for Customized Models for more detailed information.
I'm a student learning to use MATLAB. For an assignment, I have to create a simple state machine and collect some results. I'm used to using Verilog/Modelsim, and I'd like to collect data only when the state machine's output changes, which is not necessarily every time/sample period.
Right now I have a model that looks like this:
RequestChart ----> ResponseChart ----> Unit Delay Block --> (Back to RequestChart)
| |
------------------------> Mux --> "To Workspace" Sink Block
I've tried setting the sink block to save as "Array" format, but it only saves 51 values. I've tried setting it to "Timeseries", but it saves tons of zero values.
Can someone give me some suggestions? Like I said, MATLAB is new to me, please let me know if I need to clarify my question or provide more information.
Edit: Here's a screen capture of my model:
Generally Simulink will output a sample at every integration step. If you want to only output data when a particular event occurs -- in this case only when some data changes -- then do the following,
run the output of the state machine into a Detect Change block (from the Logic and Bit Operations library)
run that signal into the trigger port of a Triggered Subsystem.
run the output of the state machine into the data port of the Triggered Subsystem.
inside the triggered subsystem, run the data signal into a To Workspace block.
Data will only be saved at time point that the trigger occurs, i.e. when your data changes.
In your Simulink window, make sure the Relative Tolerance is small so that you can generate many more points in between your start and ending time. Click on the Simulation option at the top of the window, then click on Model Configuration Parameters.
From there, change the Relative Tolerance to something small... like 1e-10. After that, try running your simulation again. You should have a lot more points in your output array that you can now save.
Is there any solution for fixing a block in simulink diagram, to disable moving/resizing for the block ?
Is there any solution to draw kind of a shape in simulink (empty rectangles) ?
my aim is to fix an area in the model, so that the user is not allowed to design the model outside this area.
I tried using the callback functions with no success.
Thanks for any help.
As far as I know there is just a compromise.
As mentioned in the other answer you need to create a subsystem. In the block parameters you can set ReadOnly, so everything is fixed and greyed out, as you desired, or NoReadOrWrite access, so it is completely blocked. This solution works just for "naive" users as they can still change the properties to get access again. Maybe you find a way to prevent the user from entering the properties menu.
The secure way is much more complicated: protected Models
Regarding your question about the rectangular shape: I tried to find a solution for a long time and I'd say there is no way to "draw" something, though the backround is actually called "canvas" ;)
To your other comment: what is wrong about a subsystem? You can just block everything except the block you want the user to play around with. It opens in a new tab/window and it doesn't matter how big is everything. What you want is probably not possible in that manner.
You can achieve that to some extent using callback functions. For example let's have LoadFcn as:
A=get_param(gcb, 'Position');
and MoveFcn as
try
set_param(gcb, 'Position', A);
catch
end
This will prohibit moving and resizing, but not cut or delete. Obviously, this will pollute the workspace so you need to think of a way to manage that. If you want this for many blocks you can add the position to the userData property of block currBlock by
set_param(currBlock, 'UserData', get_param(currBlock, 'Position'));
and then just add this to the block's MoveFcn callback
try
set_param(gcb, 'Position', get_param(gcb, 'UserData'));
catch
end
You can even do this programmatically
moveFcn = sprintf([...
'try\n' ...
' set_param(gcb, ''Position'', get_param(gcb, ''UserData''));\n' ...
'catch\n' ...
'end\n']);
set_param(currBlock, ...
'UserData', get_param(currBlock, 'Position'), ...
'MoveFcn', moveFcn);
Did you tried using blocks? See this example: http://blogs.mathworks.com/seth/2008/07/27/how-to-make-your-own-simulink-block/
I am new to the EDSDK, but so far have been very happy with the results. I have my program working just fine saving to the camera, however when I set to saveTo Host I'm unclear on where it thinks it's supposed to save to.
Everything appears to work. Callback function gets called, progress bar animates but I have no idea where it thinks it's pointing the file to.
the closest I get is finding where the #"download" command is issued, the argument to this call should be getting cast as a (EdsDirectoryItemRef)
This all seems to be coming from the EDSCALLBACK handleObjectEvent but I can't figure out how it gets constructed.
Ideally I'd like to be able to specify where on disk I want the images to go. Can someone provide some aid?
[edit]
Okay, I see the images are going into the build directory, but perhaps someone could help me to understand why. Or even better how to specify a path for myself.
When you set saveTo_Host, the image is stored on a temporary memory in the camera. The camera then triggers a DirItemRequestTransfer event that would call the callback function 'handleObjectEvent'. The reference to the image, stored in the temporary camera memory, is passed to the callback function.
Within the handleObjectEvent callback function you probably would be creating a file stream and using EdsDownload to download the file to the location on the PC (which is specified by the file stream).
When you create a file stream you need to specify a file name (the first argument). This file name determines where the image would be stored. If you just specify the file name without a path the image gets stored in the build directory. If you would like to save the file in a particular location you need to specify the file name along with its path.
Hope this helps.
I have just recently started to use MATLAB to acquire data off of a data acquisition board and was in need of a function to acquire data continuously (i.e. until I ctrl^C out of the function). To do this I am using the data acquisition toolbox on a 32-bit windows OS.
Based on the documentation in matlab help and a few of the answers on this site, I found that after adding channels to my input handle I should:
set my 'SamplesPerTrigger' to Inf
set the 'TimerPeriod' to some value to trigger the 'TimerFcn'
set the 'TimerFcn' to some subfunction callback which appends data to a persistent variable
Is this a correct way to do this?
My code is as follows:
function acquire_arena_test(samprate,daq_device ,device_ID ,channels, saveroot)
setup.SampleRate = samprate;
setup.DAQdevice = {daq_device, device_ID};
setup.AIChannels = channels;
setup.SaveRoot = {saveroot};
ai = analoginput(setup.DAQdevice{1},setup.DAQdevice{2});
addchannel(ai,[setup.AIChannels]);
set(ai,'SamplesPerTrigger',Inf);
set(ai,'TimerPeriod',0.5);
set(ai,'TimerFcn',{#AcquireData,ai});
start(ai);
while(strcmpi(get(ai,'Running'),'On'))
pause(1)
end
stop(ai);
time = datestr(now,30);
save([saveroot time], 'data');
delete(ai);
clear ai;
function AcquireData(hObject, ~)
persistent totalData;
data = getdata(hObject);
if isempty(totalData)
totalData =data;
else
totalData = [totalData; data];
end
The initial analog input is definitely working properly. I have tried many permutations of giving the AcquireData callback to 'TimerFcn'. The error I receive is
`??? Error using ==> acquire_arena_test>AcquireData
Too many input arguments.
Warning: The TimerFcn callback is being disabled.
To enable the callback, set the TimerFcn property. `
Thanks in advance for any help.
I think the syntax you use for setting up your TimerFcn is wrong. You write
set(ai,'TimerFcn',{#AcquireData,ai});
but this means that your function AcquireData will be called with tree parameters: AcquireData(ai, event, ai) as explained here, which then of course triggers the error message since your AcquireData function only accepts two parameters. Just change your code to
set(ai,'TimerFcn',#AcquireData);
and it should work; the ai object is automatically passed as the first parameter (see the link to the MATLAB documentation above).
Sorry about answering my own question, but I figured it out. The trigger was not needed after all. Using a national instruments board (or a sound card, as it turns out) you can just change the LoggingMode to 'disk' and specify a file to save the .daq (data acquisition toolbox) file to save as with LogFileName. If you want to use the memory on your board, change the mode to disk&Memory. Helpful document:
http://www.mathworks.com/help/toolbox/daq/f12-16658.html
The script below acquires data during the pause, which is as long as you want it to be..
daqreset;
clear all;
ai = analoginput('nidaq','Dev1');
chans = addchannel(ai,0:6);
set(ai,'SamplesPerTrigger',Inf);
set(ai,'SampleRate',1000)
set(ai,'LogToDiskMode','Overwrite')
set(ai,'LogFileName','log.daq')
set(ai,'LoggingMode', 'disk')
start(ai)
pause()
stop(ai)
data = daqread('log.daq');
delete(ai);
Note that you still need to set 'SamplesPerTrigger' to Inf for this to work properly. Thank you to Jonas for his help as well.