Send data from workspace to callback function

Hi,

How can I get a value from my workspace in my callback function?

Example

% Configure a new listener to process the incoming data.
lh = addlistener(s,'DataAvailable', @stopWhenExceedOneV);
  function stopWhenExceedOneV(src, event, ValueFromWorkspace)
        if any(event.Data > 1.0*ValueFromWorkspace)
            disp('Event listener: Detected voltage exceeds 1, stopping acquisition')
            % Continuous acquisitions need to be stopped explicitly.
            src.stop()
            plot(event.TimeStamps, event.Data)
        else
            disp('Event listener: Continuing to acquire')
        end
  end

In this example the ValueFromWorkspace is a variable I would like to pull in from my workspace. Regards, J

Answer 1

[Walter Roberson]

If ValueFromWorkspace changes over time and you need the newest version:

Define stopWhenExceedOneV as a nested function in the workspace that defines ValueFromWorkspace, and the definition must be after ValueFromWorkspace is initialized in the outer function. You would not have ValueFromWorkspace as one of the parameters of stopWhenExceedOneV

However, if ValueFromWorkspace is constant then leave your function as it is add use

 lh = addlistener(s,'DataAvailable', @(src,event) stopWhenExceedOneV(src, event, ValueFromWorkspace));