Describe the bug
vis_cpu does not appear to be able to handle UVBeam objects which have the feed array specified in E and N and a corresponding x_orientation definition. In my particular situation the beam is specified with E and N in upper case, in case the comparison/conversion already exists but is not case-insensitive.
To Reproduce
Steps to reproduce the behavior:
have a uvbeam object with feed_array = ['E', 'N'] and x_orientation='east'
attempt to simulate anything
Expected behavior
vis_cpu should check if the feeds are specified with either x/y or e/n and convert to the internal representation accordingly.
OS: Red Hat Enterprise Linux release 8.8 (Ootpa)
Exact Error
```python
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
Cell In[154], line 1
----> 1 vis_vc = simulate_vis(
2 ants=antpos,
3 fluxes=fluxes,
4 ra=ra_new,
5 dec=dec_new,
6 freqs=freqs,
7 lsts=np.array([lst.to_value("rad")]),
8 beams=beams,
9 beam_idx=beam_ids,
10 polarized=False,
11 precision=2,
12 )
File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/vis_cpu/wrapper.py:124, in simulate_vis(ants, fluxes, ra, dec, freqs, lsts, beams, polarized, precision, latitude, use_feed, use_gpu, beam_spline_opts, beam_idx, **backend_kwargs)
121 eq2tops = np.array([conversions.eci_to_enu_matrix(lst, latitude) for lst in lsts])
123 # Create beam pixel models (if requested)
--> 124 beams = [
125 conversions.prepare_beam(beam, polarized=polarized, use_feed=use_feed)
126 for beam in beams
127 ]
129 if polarized:
130 vis = np.zeros(
131 (freqs.size, lsts.size, nfeeds, nfeeds, nants, nants), dtype=complex_dtype
132 )
File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/vis_cpu/wrapper.py:125, in (.0)
121 eq2tops = np.array([conversions.eci_to_enu_matrix(lst, latitude) for lst in lsts])
123 # Create beam pixel models (if requested)
124 beams = [
--> 125 conversions.prepare_beam(beam, polarized=polarized, use_feed=use_feed)
126 for beam in beams
127 ]
129 if polarized:
130 vis = np.zeros(
131 (freqs.size, lsts.size, nfeeds, nfeeds, nants, nants), dtype=complex_dtype
132 )
File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/vis_cpu/conversions.py:291, in prepare_beam(uvbeam, polarized, use_feed)
289 # Analytic beams have no concept of feeds, so assume they have a "single" feed
290 if getattr(uvbeam_, "Nfeeds", 1) > 1:
--> 291 uvbeam_.select(feeds=[use_feed])
293 if isinstance(uvbeam, UVBeam):
294 uvbeam_.efield_to_power(calc_cross_pols=False)
File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/pyuvdata/uvbeam/uvbeam.py:3656, in UVBeam.select(self, axis1_inds, axis2_inds, pixels, frequencies, freq_chans, feeds, polarizations, inplace, run_check, check_extra, run_check_acceptability)
3651 feed_inds = np.append(
3652 feed_inds,
3653 np.where(beam_object.feed_array == x_orient_dict[f])[0],
3654 )
3655 else:
-> 3656 raise ValueError(
3657 "Feed {f} is not present in the feed_array".format(f=f)
3658 )
3660 feed_inds = sorted(set(feed_inds))
3661 beam_object.Nfeeds = len(feed_inds)
ValueError: Feed x is not present in the feed_array
```
Describe the bug vis_cpu does not appear to be able to handle UVBeam objects which have the feed array specified in E and N and a corresponding x_orientation definition. In my particular situation the beam is specified with
EandNin upper case, in case the comparison/conversion already exists but is not case-insensitive.To Reproduce Steps to reproduce the behavior:
Expected behavior vis_cpu should check if the feeds are specified with either
x/yore/nand convert to the internal representation accordingly.Exact Error
```python --------------------------------------------------------------------------- ValueError Traceback (most recent call last) Cell In[154], line 1 ----> 1 vis_vc = simulate_vis( 2 ants=antpos, 3 fluxes=fluxes, 4 ra=ra_new, 5 dec=dec_new, 6 freqs=freqs, 7 lsts=np.array([lst.to_value("rad")]), 8 beams=beams, 9 beam_idx=beam_ids, 10 polarized=False, 11 precision=2, 12 ) File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/vis_cpu/wrapper.py:124, in simulate_vis(ants, fluxes, ra, dec, freqs, lsts, beams, polarized, precision, latitude, use_feed, use_gpu, beam_spline_opts, beam_idx, **backend_kwargs) 121 eq2tops = np.array([conversions.eci_to_enu_matrix(lst, latitude) for lst in lsts]) 123 # Create beam pixel models (if requested) --> 124 beams = [ 125 conversions.prepare_beam(beam, polarized=polarized, use_feed=use_feed) 126 for beam in beams 127 ] 129 if polarized: 130 vis = np.zeros( 131 (freqs.size, lsts.size, nfeeds, nfeeds, nants, nants), dtype=complex_dtype 132 ) File /opt/devel/mkolopanis/envs/vis_cpu/lib/python3.10/site-packages/vis_cpu/wrapper.py:125, in