Is there a function similar to 'rehash' for Data acquisition toolbox?

Using the data acquisition toolbox session based architecture, the list of devices is stale until you restart matlab. I was looking through the documentation and didn't see a function that forces matlab to check to see if you had added/removed a data acquisition device. daq.getDevices fails to show a newly added device.

Also, is there a function that checks to see if there are any stray sessions left in memory?

Answer 1

[Walter Roberson]

You could try

instrreset
daqreset

If those do not work for you, then NO, restarting MATLAB is the only documented solution.