[Paraview] [EXTERNAL] Re: Python calculator and max bug

[Scott, W Alan]

Excellent.  We are keeping you!

:-)

Alan

From: Berk Geveci [mailto:berk.geveci at kitware.com]
Sent: Friday, June 20, 2014 6:11 PM
To: Scott, W Alan
Cc: paraview at paraview.org
Subject: [EXTERNAL] Re: [Paraview] Python calculator and max bug

Hi Alan,

I am almost done completely rewriting the Python code under this filter. We'll make sure that this bug is addressed as part of the rewrite. I have global min/max/std deviation etc. working very nicely. I'll add support for min/max per block. I'll call them min_per_block(), max_per_block() etc.

-berk

On Fri, Jun 20, 2014 at 7:30 PM, Scott, W Alan <wascott at sandia.gov<mailto:wascott at sandia.gov>> wrote:
Berk,
After looking at this, yep – it’s a bug.  I wrote it up as bug number 14816, with a good example using can.exo.

I like what you wrote below – max-per-block, or maxPerBlock?

Alan




From the ParaView e-mail list:

Simply max(von_mises) doesn't do it? The calculator is supposed to convert scalars to arrays automatically but maybe there is an issue there...

PS: This is somewhat ironic. I am working on changes to support things like min/max over all blocks. Those changes would make min/max over block impossible :-) So I guess we want both. What would a good function name for XXX per block be?

-berk

On Mon, Jun 9, 2014 at 6:24 PM, Scott, W Alan <wascott at sandia.gov<mailto:wascott at sandia.gov>> wrote:

Hi,
I am coloring blocks by the maximum value of a variable that occurs within that given block.  I am dealing with a large number of blocks, so I don't want to extract each block and color one by one.

I'm currently using the python calculator to do this, since the function "max()" returns block-by-block maximum (scalar), which is what I want.  The issue is that paraview doesn't return the returned value as an array, so using the maximum values per block directly in an expression doesn't work.  I'm using a pretty sad-looking syntax to get the job done.  My expression is something along the lines of:

Expression:   ((von_mises - von_mises)+1)*max(von_mises)

So, I'm creating an array of 1's for each cell and then scaling it by the maximum value in a given block.  There must be a better way of doing this, right?  Something like "max_by_block()" or "create_cell_array_ones()."  If not, perhaps that could become a feature request.

Thanks,
Alan




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