There is a file named awgn.m in this directory
C:\Users\Admin\Documents\MATLAB
that precedes MATLAB's awgn.m function on your path.
When you enter:
>>which awgn
you should see something like:
toolbox\comm\comm\awgn.m
You need to either remove the directory: C:\Users\Admin\Documents\MATLAB
from your path with
rmpath('C:\Users\Admin\Documents\MATLAB');
or if you need other files in that directory, move awgn.m out of there. Delete it, or copy it to a directory not on the MATLAB path. Enter
>>path
to see everything on the MATLAB path. The "bad" awgn.m is a script and you are tyring to call MATLAB's awgn.m, but because the other path comes first, MATLAB tries to use the script like a function.
