File talk:Zernike polynomials2.png
This figure is not consistent with the formulae in the article. Which ever way the color scale is chosen (e.g. red is positive, blue is negative) some of the graphs disagree with corresponding formulae. For example: Z_2^2 = x^2 - y^2 according to the text but the figure shows y^2-x^2.
- The figure may still be correct if one assumes that the x-axis points to
the left and the y-axis up, the blue=+1 and red=-1. To save the effort one might put this into the figure caption and live with it. To show the signs that I would expect, I've put another version into the commons
