I've been working my way through the flow core demo codec and encountered a problem on line 157:

> summary(filter(smaller[[1]],rectGate %&% morphGate))
Error in as.vector(data) : 
  no method for coercing this S4 class to a vector
> summary(filter(smaller[[1]],rectGate & morphGate))
Fluorescence Region and MorphologyGate+: 7193 of 8312 events (86.54%)
> 

Is the operator really supposed to be %&% in this code?

Nothing wrong with the code and operator '%&%', you should type traceback() to find out where exactly failed. 

But this concept of combining two filters has been deprecated, you want to move on to 'GatingSet' section to learn how to build, track and record the gating hierarchy. Also refer to 'openCyto' for more streamlined and automated gating.