lsst.cp.pipe.astierCovPtcFit.Pol2d Class Reference

Public Member Functions
def	__init__ (self, x, y, z, order, w=None)
def	monomials (self, x, y)
def	eval (self, x, y)

Public Attributes
	orderx
	ordery

Detailed Description

A class to calculate 2D polynomials

Definition at line 186 of file astierCovPtcFit.py.

Constructor & Destructor Documentation

__init__()

def lsst.cp.pipe.astierCovPtcFit.Pol2d.__init__	(		self,
			x,
			y,
			z,
			order,
			w = None
	)

Definition at line 189 of file astierCovPtcFit.py.

    def __init__(self, x, y, z, order, w=None):
        self.orderx = min(order, x.shape[0]-1)
        self.ordery = min(order, x.shape[1]-1)
        G = self.monomials(x.ravel(), y.ravel())
        if w is None:
            self.coeff, _, rank, _ = np.linalg.lstsq(G, z.ravel())
        else:
            self.coeff, _, rank, _ = np.linalg.lstsq((w.ravel()*G.T).T, z.ravel()*w.ravel())
 

Member Function Documentation

eval()

def lsst.cp.pipe.astierCovPtcFit.Pol2d.eval	(		self,
			x,
			y
	)

Definition at line 207 of file astierCovPtcFit.py.

    def eval(self, x, y):
        G = self.monomials(x, y)
 
        return np.dot(G, self.coeff)
 
 

monomials()

def lsst.cp.pipe.astierCovPtcFit.Pol2d.monomials	(		self,
			x,
			y
	)

Definition at line 198 of file astierCovPtcFit.py.

    def monomials(self, x, y):
        ncols = (self.orderx+1)*(self.ordery+1)
        G = np.zeros(x.shape + (ncols,))
        ij = itertools.product(range(self.orderx+1), range(self.ordery+1))
        for k, (i, j) in enumerate(ij):
            G[..., k] = x**i * y**j
 
        return G
 

Member Data Documentation

orderx

lsst.cp.pipe.astierCovPtcFit.Pol2d.orderx

Definition at line 190 of file astierCovPtcFit.py.

ordery

lsst.cp.pipe.astierCovPtcFit.Pol2d.ordery

Definition at line 191 of file astierCovPtcFit.py.

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/0.1.5/Linux64/cp_pipe/21.0.0-5-gb7080ec+8658c79ec4/python/lsst/cp/pipe/astierCovPtcFit.py