Yuxiang Wang wrote: > Dear all, > > I was wondering is there a convenient inverse function of > np.polyval(), where I give the y value and it solves for x? > > I know one way I could do this is: > > import numpy as np > > # Set up the question > p = np.array([1, 1, -10]) > y = 100 > > # Solve > p_temp = p > p_temp[-1] -= y > x = np.roots(p_temp) > > However my guess is most would agree on that this code has low > readability. Any suggestions? > > Thanks! > > -Shawn > >
Did you get the polynomial from polyfit? In that case just swap x<->y _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
