Using variables with spectrumMeas

Hello -

Variables work with the spectrumMeas function except for the "number of samples" entry. It requires an actual integer number. Is there a work around?

For example, this works

spectrumMeas(VT("/DoutDecimal") VAR("Tstart") VAR("Tend") 2048 1 dF VAR("BW") "Hanning" 2 "sinad" )

This does NOT work (replaced 2048 with VAR("Npts")

spectrumMeas(VT("/DoutDecimal") VAR("Tstart") VAR("Tend") VAR("Npts") 1 dF VAR("BW") "Hanning" 2 "sinad" )

I'm using virtuoso sub-version IC6.1.8-64b.500.8

Tanks,

rg