[Nek5000-users] Reading binary data

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

Stefan,

Thanks.  I figured that, but the binary file size doesn't seem to be adding up.    For example,  a field file that doesn't have geometry data is the size described by the initial thread, i.e.

132 bytes + 4 bytes + nel* 4 bytes + nfields*nxyz*nel* wdsizo  +  nfields*2*nel * 4 bytes

My naive assumption was that a field file with xyz data would then have the additional space requirement of

nx*ny*nz*nel*wdsizo

but the file's bigger than that.  What info am I missing?  

--Mike

On Aug 11, 2010, at 3:50 PM, <nek5000-users at lists.mcs.anl.gov> wrote:

> Hi Mike,
> 
> vector fields (e.g. mesh coordinates) are stored in the following way:
> 
> LOOP over all elements
> 	LOOP i = {x,y,z}
> 		 i for all GLL points (internal element points)
> 	ENDLOOP
> ENDLOOP
> 
> 2D example with (E=2,N=2):
> x1_1 x2_1 x3_1 y1_1 y2_1 y3_1 x1_1 x2_2 x3_2 y1_2 y2_2 y3_2
> 
> where x2_1 means the x-coordinate of the 2nd GLL point of element 1.
> 
> hth,
> Stefan 
> 
> On Aug 11, 2010, at 11:34 PM, <nek5000-users at lists.mcs.anl.gov> wrote:
> 
>> 
>> Hello All.  I found this helpful message from Stefan regarding the structure of a binary field file.   Could someone please tell me what the structure is when the geometry info is also contained?
>> 
>> Thanks!
>> --Mike
>> 
>> nek5000-users at lists.mcs.anl.gov nek5000-users at lists.mcs.anl.gov 
>>> Thu May 6 07:18:03 CDT 2010
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>>> Hi Fred,
>>> 
>>> header: 132 bytes
>>> endian test tag: 4 bytes
>>> element mapping: nel* 4 bytes
>>> data: nfields*nxyz*nel* wdsizo (where wdsizo is 4 or 8 bytes)
>>> metadata (min/max values): nfields*2*nel * 4 bytes
>>> 
>>> Stefan
>>> 
>> 
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