[Paraview] nan

[Scott, W Alan]

Question - shouldn't the calculator be able to handle this?  When you have "Replace invalid results" checked, shouldn't that change NANs to 0's?

Is this a bug - and should I write up a bug report?

Thanks,

Alan

From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Scott, W Alan
Sent: Friday, August 20, 2010 11:13 AM
To: 'Eric E. Monson'
Cc: 'paraview at paraview.org list'
Subject: Re: [Paraview] nan

Thanks all!  I believe we have found numerous solutions.

Alan

From: Eric E. Monson [mailto:emonson at cs.duke.edu]
Sent: Friday, August 20, 2010 9:26 AM
To: Scott, W Alan
Cc: David E DeMarle; Aurélien Marsan; paraview at paraview.org list
Subject: Re: [Paraview] nan

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<mailto: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<mailto: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<mailto: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<mailto: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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