Following some refactoring earlier this year, the PfsArm class has been refactored and moved to drp.py.

Here's skeleton code for creating a PfsArm file:

from pfs.datamodel.drp import PfsArm
[...]
PfsArm(dataId, fiberIds, wavelength, flux, mask,
                      sky, covar, flags, metadata)

For the constructor parameters, see also the docString for parent class PfsSpectra in pfsSpectra.py .

Assigned to price to provide additional support.

OK. I'll give it a try.

Then, another question arises. How can I make a pfsObject from a set of pfsArm objects? Previously, we used makePfsObject.py but it seems to be outdated. Is it possible to update makePfsObject.py? Or, is there an easy way to do that?

Can you use the MergeArmsTask in drp_stella? If not, what are you trying to do?

The DRP design document is slightly outdated now, but it might be useful to read.

We can use it if it is included in datamodel package. We (ETC users) don't want to install the DRP packages. What I want to do is just to make both pfsArm and pfsObject fits files with simulated spectra included. I could make pfsArm file using drp.py but not for pfsObject...

Making a PfsObject from PfsArm files necessarily involves algorithmic code (interpolation and coaddition), which I think would be good to keep out of the data model package. Perhaps you could copy the implementation from MergeArmsTask?

Alternatively, I have been working on updating the 1D simulator (ticket SURVEY-7?), and have just been waiting for the recent changes to settle before pushing it out.

I think the remaining questions are addressed in DAMD-63.