Undefined function 'awgn' for input arguments of type 'double'

I have a similar problem.Weird thing is I had my awgn function working yesterday.But today on the same system it doesn't work.And yes I have my communication systems toolbox installed.(ver tells me that i have the toolbox)

snr=3; x=ones(10,1)'; y=awgn(x,snr); "Undefined function 'awgn' for input arguments of type 'double' " is the response. Should i unlock the Comm Systems toolbox or something?

Answer 1

[Wayne King]

Does this command return a 1:

 license('test','communication_toolbox')

Are you in a networked configuration where only so many licenses can be checked out at once?

If not try:

 rehash

[Avinas Vem]

The answer was right there. Yes my lab has only a certain licenses that can be checked out at an instance. Thanks a lot Wayne..