check out

>>UIPUTFILE

-Doug

I am saving the data that i obtain from my NI DAQ card in a .daq file. This is the code snippet for it.
================================
ai.LogToDiskMode = ‘index’;
ai.LoggingMode = ‘Disk&Memory’;
ai.LogFileName = ‘data.daq’;
ai.logging;
================================

And this stores the file by default in the working directory. I was wondering if there is a way where the user can specify the location of the file he would like to store it in via a GUI.

Thanks for all your help Doug !
Appreciate it.

The term “real time” means a lot of things to a lot of people. I am going to assume you mean “soft real time”, basically Windows is doing its best to keep up, but it might not be every clock cycle. If you are looking for hard real time, then you would want xPC.

Anyways, you could use a timer object to go through the above process every tenth of a second, query the data and so on. If you combine the ideas in this video with the ideas here:

http://blogs.mathworks.com/videos/2008/05/05/advanced-matlab-timer-objects/

You should be doing well.

-Doug

Firstly thanks so much for this great effort on your part for creating these videos. They are *VERY* helpful :).

I have a question, i am using a DAQ and i need to plot the data in real time and not after the data has been collected.
Is there a way to do this ?

Thanks for your help !

That is something that can be done. Do you have the Data Acquisition toolbox? What have you tried, can you connect to the board? What board is it?

Doug

Actually, I already tried before to use this property because I saw that it was what I wanted, nevertheless I got this error:

EDU>> AO = analogoutput(’ueidaq’,'pwrdaq://dev0′);
EDU>> addchannel (AO, 0);
EDU>> AO.OutOfDataMode = ‘DefaultValue’;
??? Error using ==> daqdevice.subsasgn at 108
Error using ==> daqdevice.set at 261
Invalid property: ‘OutOfDataMode’.

Then I tried to skip it just by doing :
EDU>> AO.Channel.DefaultChannelValue = 5;

And then I had no error but also no effect : I still got a value of “zero” instead of 5 volts between the two steps ..

I don’t know why this property is not recongnized, do you ?
I am using the R2007a student version of matlab.

Thanks,
pierre

All of these things are well documented here:
http://www.mathworks.com/access/helpdesk/help/toolbox/daq/daq.html
They can also be seen in the demos . Bring up MATLAB and type:
demo(’toolbox’,'data acquisition’)
at the command line (requires that Data Acquisition Toolbox already is installed).

Regards,
Sherryl