Missing Header extract subset of snapshots particles
Xiaoju Xu
26 Mar '18
Hi, I was trying to extract subsets (all dark matter particles) of Illustris 2 hydrodynamic simulation, some information in Header of .hdf5 was missing.
The code I was using is:
When I tried to read data with python, all the data in 'PartType1' is same as the 'PartType1' in raw data downloaded directly from Illustris 2 web page, but the Header part was incomplete. For example, if I check attributes in Header with header.attrs['BoxSize'] or header.attrs['Time'], there's nothing, but they all exist in the raw particle data. Sorry that I may didn't make the question vary clear, I wanted to get all the dark matter particles in some snapshots in Illustris 2 hydrodynamic simulation, not only particles of some specific halo or subhalo. Since I plan to use this subsets of particle data as input to other code, I want to include all the Header information as same as raw complete particle data in .hdf5 file, at least include OmegaLambda, Omega0, HubbleParam, Time, BoxSize, NumPart_ThisFile, NumPart_Total_HighWord, NumPart_Total, MassTable. Can you add these in the Header of hdf5 file downloaded with API?
Xiaoju
Dylan Nelson
28 Mar '18
Hi Xiaoju,
Sorry for the mixup, I thought you were doing subhalo/halo cutouts of snapshot data.
I have added the full Header also to these field cutouts of snapshot data.
Xiaoju Xu
29 Mar '18
Hi Dylan,
Thank you so much, I think it already including everything I need except for NumPart_ThisFile. It seems this parameter is also very important for me, can you please also add this in Header? Sorry about having so many requirements.
Xiaoju Xu
29 Mar '18
Hi Dylan,
Thank you so much, I think it already including everything I need except for NumPart_ThisFile. It seems this parameter is also very important for me, can you please also add this in Header? Sorry about having so many requirements.
Hi, I was trying to extract subsets (all dark matter particles) of Illustris 2 hydrodynamic simulation, some information in Header of .hdf5 was missing. The code I was using is:
url='http://www.illustris-project.org/api/Illustris-2/files/snapshot-'+str(snap)+'.'+str(block)+'.hdf5' headers={"api-key"} params={'dm':'Coordinates,ParticleIDs,Potential,Velocities'} data=requests.get(url,headers=headers,params=params)
When I tried to read data with python, all the data in 'PartType1' is same as the 'PartType1' in raw data downloaded directly from Illustris 2 web page, but the Header part was incomplete. For example, if I check attributes in Header with header.attrs['BoxSize'] or header.attrs['Time'], there's nothing, but they all exist in the raw particle data. Sorry that I may didn't make the question vary clear, I wanted to get all the dark matter particles in some snapshots in Illustris 2 hydrodynamic simulation, not only particles of some specific halo or subhalo. Since I plan to use this subsets of particle data as input to other code, I want to include all the Header information as same as raw complete particle data in .hdf5 file, at least include OmegaLambda, Omega0, HubbleParam, Time, BoxSize, NumPart_ThisFile, NumPart_Total_HighWord, NumPart_Total, MassTable. Can you add these in the Header of hdf5 file downloaded with API?
Xiaoju
Hi Xiaoju,
Sorry for the mixup, I thought you were doing subhalo/halo cutouts of snapshot data.
I have added the full
Headeralso to these field cutouts of snapshot data.Hi Dylan,
Thank you so much, I think it already including everything I need except for NumPart_ThisFile. It seems this parameter is also very important for me, can you please also add this in Header? Sorry about having so many requirements.
Hi Dylan,
Thank you so much, I think it already including everything I need except for NumPart_ThisFile. It seems this parameter is also very important for me, can you please also add this in Header? Sorry about having so many requirements.
This should be fixed now.
Thank you!