code: def shiftx_image2d_flux(image2d_orig, xoffset):
      
  
      if image2d_orig.ndim == 1:
          naxis1 = image2d_orig.size
      elif image2d_orig.ndim == 2:
          naxis2, naxis1 = image2d_orig.shape
      else:
          print('>>> image2d_orig.shape:', image2d_orig.shape)
          raise ValueError('Unexpected number of dimensions')
  
      return resample_image2d_flux(image2d_orig,
                                   naxis1=naxis1,
                                   cdelt1=1,
                                   crval1=1,
                                   crpix1=1,
                                   coeff=[xoffset, 1])
docs: Resample 2D image using a shift in the x direction (flux is preserved).
  
      Parameters
      ----------
      image2d_orig : numpy array
          2D image to be resampled.
      xoffset : float
          Offset to be applied.
  
      Returns
      -------
      image2d_resampled : numpy array
          Resampled 2D image.