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Re: [Gnuplot-py-users] Handling NaN-values
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From: Felix S. <fel...@ui...> - 2010-08-16 13:35:41
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Hi Benny, thanks for your answer. The solution is nice enough for me and works just fine :-). Felix bm...@ca... wrote: > Quoting Felix Schueller<fel...@ui...>: > >> Hi there, >> >> i got a question on how to best handle NaN values. >> >> I'm plotting 3 x-y curves into one plot (data comes from 3 files which >> are read and processed earlier in my code). >> Sometimes one of them has NaN-values at the y=0 point. If i just convert >> the NaN-values as everthing else: >> >> data_array.append(float(THENANVALUE)) >> >> the data array contains the nan and my values just fine. However if i >> then proceed to g.plot(...), i get a >> >> line 0: Bad data on line 1 >> >> error. >> >> What i would like to have, is a plot where the undefined lowest value is >> ignored and plotting starts at the first defined value. >> >> Is there a simple solution to this/ any suggestion? > > You need to remove the NaN before plotting. This is also the behavior > I would want, not that things are plotted with undefined values > without me knowing it. > > To obtain only the nonNan from a x,y plot: > z = N.asarray([[x,y] for x,y in zip(a,b) if not math.isnan(x) ]) > then plot z[:,0] and z[:,1] instead of x,y > > Probably there are nicer ways to do this filtering, a masked array perhaps. > > Benny >> Thanks in advance for any answers! :-) >> >> Felix >> >> >> >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by >> >> Make an app they can't live without >> Enter the BlackBerry Developer Challenge >> http://p.sf.net/sfu/RIM-dev2dev >> _______________________________________________ >> Gnuplot-py-users mailing list >> Gnu...@li... >> https://lists.sourceforge.net/lists/listinfo/gnuplot-py-users >> > > > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > Gnuplot-py-users mailing list > Gnu...@li... > https://lists.sourceforge.net/lists/listinfo/gnuplot-py-users |