In the RooFit users manual, it says to do this to set the number of bins for a RooRealVar only for the FFT convolution:
// Define sampling frequency
(see page 40 of root.cern.ch/download/doc/RooFit … .91-33.pdf)
This, however, did not work, even when I reversed the order of the arguments to setBins.
Did something change since the manual was written?