[Nek5000-users] r,s,t index for given point

[nek5000-users at lists.mcs.anl.gov]

Hi,

what is the difference between "index" and "value"?
Essentially, I am looking for the information postx provides when 
figuring out history points. I browsed the postx source code, located 
the routine and implemented it in .usr, but I expect trouble when moving 
to bigger domains. I also figured there must be something in nek.

So I took the new hpts routine (see attached my modified .usr file), 
what I am getting for r,s,t for a specific point is:
1.00000000000000      -5.551115123125783E-017  -1.00000000000000

The real deal for the same point (from postx) is 4    1    1.

What am I missing? Is there a way to go from the output I have to the 
r,s,t indices?

Thanks for any help,
Markus


nek5000-users at lists.mcs.anl.gov wrote:
> 
> Markus,
> 
> those r,s,t values (not indices) are valid  - do they not correspond
> to your expectations?  Off-hand one might expect that the associated
> indices would be 1,NY1/2,NZ1
> 
> Paul
> 
> 
> On Fri, 9 Jul 2010, nek5000-users at lists.mcs.anl.gov wrote:
> 
>> Howdy Neks,
>>
>> is there a function in Nek that for a given point in x,y,z would 
>> return processor number, element number and r,s,t index of the nearest 
>> GLL grid point? I was desperately trying to figure out how the 
>> interpolation routines (f.e. for history points) would help me, but I 
>> only got garbage (-1, 0 and 1) back for the variables I would expect 
>> contain r,s,t. It worked with the element number, however.
>>
>> Thanks,
>> Markus
>>
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