# healpy.projector.CartesianProj.xy2ij¶

CartesianProj.xy2ij(self, x, y=None)

From position in the projection plane to image array index (Cartesian).

Input:
• x : if y is None, x[0], x[1] define the position in Cartesian plane.

• y : if defined, x,y define the position in projection plane.

• projinfo : additional projection information.

Return:
• i,j : image array indices.