ZernikeAnnularGrad¶
- lsst.ts.wep.utils.ZernikeAnnularGrad(z, x, y, e, axis)¶
Evaluate the gradient of annular Zernike polynomials in a certain direction.
- Parameters:
- znumpy.ndarray
Coefficient of annular Zernike polynomials.
- xnumpy.ndarray
X coordinate on pupil plane.
- ynumpy.ndarray
Y coordinate on pupil plane.
- efloat
Obscuration value. It is 0.61 in LSST.
- axisstr
It can be “dx”, “dy”, “dx2”, “dy2”, or “dxy”.
- Returns:
- numpy.ndarray
Integration elements of gradient part in pupil x and y directions.
- Raises:
- ValueError
Raise error for invalid axis argument