What does the Vec Length parameter signify in gnuradio-companion blocks? I have realized that Vec Length for the USRP2 source is by default 2 and cannot be changed on the GUI. How can this be changed to 1? In my case, I have set the USRP2 UHD source Input Type to Short. I am assuming that this means that Input Type is a typo and in real sense it defines the output type of the USRP2 source. This short type however seems to have a Vec Length of 2.