local_partial_pixel_derivatives¶
- astropy.wcs.utils.local_partial_pixel_derivatives(wcs, *pixel, normalize_by_world=False)[source]¶
Return a matrix of shape
(world_n_dim, pixel_n_dim)where each entry[i, j]is the partial derivative d(world_i)/d(pixel_j) at the requested pixel position.- Parameters:
- wcs
WCS The WCS transformation to evaluate the derivatives for.
- *pixel
python:float The scalar pixel coordinates at which to evaluate the derivatives.
- normalize_by_worldbool
If
True, the matrix is normalized so that for each world entry the derivatives add up to 1.
- wcs