Greetings Tilly, Add this function to your local Jython library (click "Edit" -> "Formulas" -> "Jython Library", and select "Local Jython" -> "User's Library"), and give it a try: def getBit(flag, n): """ return the value of the nth bit of the given flag """ bit_mask = 1 << (bitNumber -1) if ((bit_mask & flag) == 0): return 0 else: return 1 (note: if the formatting of this function does not come out right in my message, be sure to add four spaces to everything after the first line [def getBit(flag, n):], and an additional four spaces to the "return" lines) Cheers! Sean > Dear Sean > Thank you for your help! > I'm dealing with a 32 bit integer. > Cheers, > Tilly > > -----Oorspronkelijk bericht----- > Van: Unidata IDV Support [mailto:address@hidden > Verzonden: vrijdag 23 september 2011 18:59 > Aan: Driesenaar, Tilly (KNMI) > Onderwerp: [IDV #PHU-486914]: question > > Greetings Tilly! > > What kind of interger is QCF (16 bit, 32 bit?)? In Jython 2.6, the bin > operator will be supported, so things will be much easier. However, you will > need to create a bitmask and use the bit-wise operator & to extract the > information you need. If I knew what kind of int you were dealing with, I > could give you an example to extract out the 17th bit. > > Cheers! > > Sean > > > Dear IDV support desk > > > > > > > > I would like to plot the information in an integer quality flag in IDV. > > > > The flag consists of several masks, e.g. the first, or second or 17th > > bit are set . > > > > In python I would use any of the following commands to extract > > information from this integer quality flag (say QCF). > > > > (As you can see I'm especially interested in the 17th bit (or mask value > > 2**17) ) > > > > > > > > bin(int(QCF))[-18] (look at the value of the 17th bit ) > > > > or > > > > (int(QCF)/2**17)%2 (so divide by mask value and do modulo 2) > > > > > > > > How do I get this into an IDV formula? > > > > I tried (QCF/2**17)%2 , but that doesn't seem to evaluate in the right > > way. > > > > > > > > Kind regards, > > > > Tilly Driesenaar > > > > KNMI > > > > The Netherlands > > > > > > > > > > > > > Ticket Details > =================== > Ticket ID: PHU-486914 > Department: Support IDV > Priority: Normal > Status: Closed > > Ticket Details =================== Ticket ID: PHU-486914 Department: Support IDV Priority: Normal Status: Open
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