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Nikos, Glad to be of help. I also wanted to mention that we added the flowvector formula to the IDV library. In the next version of the IDV you should be able to use that formula as a derived field rather than having to write your own. Best, Unidata IDV Support > Thanks a lot.....you save my day > > Nikos Konstantinou > > address@hidden> wrote: > > > Nikos, > > > > I made a screencast that explains how to do what you ask. Please see: > > > > > > https://www.youtube.com/watch?v=TuHpf3HT3Xs&list=PLQut5OXpV-0gqVk8LFD6Riv6X3QcAVw_U&index=14 > > > > http://goo.gl/n0Frpb > > > > Best, > > > > Unidata IDV Support > > > > > Hi, > > > > > > It's my first time that I am using the IDV so I am not very familiar > > > with the use of IDV's formulas and libraries. I am trying to plot > > > the direction (degrees) of ocean wave that I've got as a gridded file > > > (grib2 from NCEP) and I'd like to plot as vectors. I have already read > > > the thread ((IDV #VIH-663165) plotting wave direction vectors) but no > > > luck. Probably I have trouble adding and save the formula (that it's > > > mentioned in the above thread), and how to use. > > > > > > I would appreciate if you tell me, explicitly, what steps I have to > > > take. > > > > > > Best Regards > > > > > > Nikos Konstantinou > > > > > > > > > > > > Ticket Details > > =================== > > Ticket ID: CZQ-485534 > > Department: Support IDV > > Priority: Normal > > Status: Closed > > > > > > > -- > ????? ???????????? > > Ticket Details =================== Ticket ID: CZQ-485534 Department: Support IDV Priority: Normal Status: Closed