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Hi Rich, > IDV Gurus, > You keep that up and we're going to start thinking highly of ourselves. > We often initialize the sea floor with a certain thickness of sediment > and then want to see how the bed changes with time. To see this > clearly it would be nice to create a formula that subtracts the > initial value of the sediment thickness (at time step =1) from every > other time step of sediment thickness, so that the initial change > field would show all zeros, and then we would see the changes with > time. > > Is this possible? > Yes. But not right now. We have a number of routines in the grid.py library: timeStepDifference timeStepSum minOverTime etc. We just don't have any that do a difference from a fixed time step. I'll create a routine for that tomorrow. But, can you brainstorm other related functions you might want to use that deal with one field and multiple times? -Jeff Ticket Details =================== Ticket ID: ZMQ-488883 Department: Support IDV Priority: Normal Status: Open