I get that warning when I execute scipy.special.chebyt(1) The error comes from somewhere inside of gen_roots_and_weights What might be causing this? Also, how can I go about tracking down the source? I tried by pasting various bits of code from various scipy files and seeing if error is reproduced, but is there a more efficient method? -- Yaroslav Bulatov bulatov@cs.oregonstate.edu Dearborn 102 Oregon State University Corvallis, OR