radial_sum_sparse center is different

[ercius]

I want to document that radial_sum_sparse has a different center than other stempy functions like create_stem_images.

I will need to fix this so that everything matches, and we should document how to determine the center. I have a small-ish dataset where we can test this in the future:

# Input center as (col, row)
center = (185, 398) # or use stempy.image.com_dense()
fg,ax = plt.subplots(1,1)
ax.imshow(dp)
ax.scatter(center[0], center[1],c='r')
ax.legend(['center of pattern'])

# STEM images
images = stim.create_stem_images(electron_events, (0, 180), (50, 280), center=center) # here center is (row, col)

# Radial sum
radial_sum = stim.radial_sum_sparse(ee3, crop_dimensions, (576,576), center[::-1]) # center is (col, row)

[harsh07051]

I will like to take it up.