If the function generator supports IVI-C driver. You could install the following support package that installs drivers that helps MATLAB to talk to IVI-C drivers:
Also, Agilent devices need the following drivers to talk to MATLAB. Install this driver and then reboot the computer and try connecting to the device by using the below commands:
>> f= fgen();
% >> f.drivers % This will let you know the supported drivers/devices that are installed on your computer
>> f.Resource = <device resource ID>; %you can get the information by using f.Resources command
>> f.Driver = <drive name eg:Ag3352x>; % sets the driver value explicitly to appropriate value
>> f.connect
