[Paraview] nan

[Eric E. Monson]

If you can use numpy, and you're using a recent-enough version of ParaView, then you can also use the super-spiffy-numpy-hidden-behind-the-scenes programmable filter API to replace all of the attribute arrays with zero'd versions:

pdi = self.GetInputDataObject(0,0)
pdo = self.GetOutputDataObject(0)
pdo.CopyStructure(pdi)

for att_name in inputs[0].PointData.keys():
	naninc = inputs[0].PointData[att_name]
	zerod = numpy.nan_to_num(naninc)
	output.PointData.append(zerod, att_name)

Talk to you later,
-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Aug 20, 2010, at 10:00 AM, Aurélien Marsan wrote:

> Hi, 
> 
> If you're using python, and if you can use the numpy library, you can use the function numpy.nan_to_num too. 
> http://docs.scipy.org/doc/numpy/reference/generated/numpy.nan_to_num.html#numpy.nan_to_num
> 
> Regards, 
> 
> Aurélien
> 
> 2010/8/20 David E DeMarle <dave.demarle at kitware.com>
> That said, the same trick may work in the standard calculator filter
> with the expression:
> 
> if(val=val, val, 0.0)
> 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
> 
> 
> 
> On Fri, Aug 20, 2010 at 9:26 AM, David E DeMarle
> <dave.demarle at kitware.com> wrote:
> > You might write a python filter that iterates over all floating point arrays and
> > replaces nan's with 0.
> >
> > According to http://stackoverflow.com/questions/944700/how-to-check-for-nan-in-python
> > The most py version robust way to check for nan is:
> >
> > def isNaN(num):
> >    return num != num
> >
> > David E DeMarle
> > Kitware, Inc.
> > R&D Engineer
> > 28 Corporate Drive
> > Clifton Park, NY 12065-8662
> > Phone: 518-371-3971 x109
> >
> >
> >
> > On Thu, Aug 19, 2010 at 11:24 PM, Moreland, Kenneth <kmorel at sandia.gov> wrote:
> >> This might not be the best solution, but you can use the threshold filter to
> >> remove NANs.  A NAN will always fall outside the threshold range.
> >>
> >> -Ken
> >>
> >>
> >> On 8/19/10 6:28 PM, "Scott, W Alan" <wascott at sandia.gov> wrote:
> >>
> >> Is there a way to convert nan’s to zeros in ParaView?  I have a user that is
> >> trying to use the integrate data filter, and it is having troubles with
> >> NANs.
> >>
> >> Thanks,
> >>
> >> Alan
> >>
> >>
> >>
> >>
> >>
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