One more question: Can writer write a vector image or matrix image into a file directly? Is the rescaler necessary? Thanks! -- Best wishes, Bing Jian bjian at cise . ufl . edu On Mon, 13 Oct 2003, Bing Jian wrote: > > One more question: > > What's the differenece between Vector, CovariantVector and Offset? > What's the right way to make conversion between them each other? > Thanks! > >