character see details in read.ncdfFlowset
when all the ncdfFlowSets shared the same cdf file, by supplying this argument, it will use the existing cdf and avoid writing to it unneccessarily.
character the vector of sample names which determine the physical sample storage order in original cdf file.
Default is NULL, which derives from the given ncdfFlowSet objects.
Value
a new ncdfFlowSet with a new cdf file that combines multiple raw datasets.