Thanks, indeed this solved the problem in the example. Unfortunately, there is still a problem, if the degree of both polynomials U and V increases to, say d = 1024. Note that the degree of the rational function P = U/V is still 0 and both poles (0 and 1) are far enough outside of the range where I want to plot.
d = 1024 R = PolynomialRing(ZZ, x) U = x^d + R.random_element(d-1) V = x^d - x^(d-1) U = expand(U) V = expand(V) P = U/V G = P.plot(2, 15) G.show() returns verbose 0 (2999: plot.py, generate_plot_points) WARNING: When plotting, failed to evaluate function at 5 points. verbose 0 (2999: plot.py, generate_plot_points) Last error message: '' as error message. And even the option plot_points=5 does not change that, although computing several values for P on the interval goes smoothely. Perhaps the problem is, that plot stores the values of P as fractions with quite large numerator and denominator, although it would suffice to store a numerical approximation -- which is someplace around 1? Any ideas? Konstantin
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