Adding column entries to DataFrame objects

The DataFrame class comes from the IRanges package and is used by several other packages (eg. Rsamtools) to read in bam files.

Simply cbind-ing a column to the DataFrame object will change it to the more conventional data.frame class.

So, instead of 
cbind(object1,newcolumn)

do:
cbind(object1,DataFrame(newcolumn))

to ensure that the result is still in the DataFrame class.