From: <bm...@ca...> - 2010-08-16 12:38:29
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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. |