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Dear Mathgroup! I need to perform some calculations involving elliptic functions. after the first attempt to use Mathematica's WeierstrassP function I found that it is defined in terms of the invariants g2 and g3, not the torus periods omega and omega prime: In:= ?WeierstrassP WeierstrassP[u, g2, g3] gives the Weierstrass elliptic function P. Moreover it is not defined for all complex values of g2 and g3: Mathematica 2.0 for DEC RISC Copyright 1988-91 Wolfram Research, Inc. -- X11 windows graphics initialized -- In:=WeierstrassP[1,I,I] Out= WeierstrassP[1, I, I] In:= %//N Out= WeierstrassP[1., 1. I, 1. I] At the same time In:= WeierstrassP[1,1,I]//N Out= 1.20281 but In:= WeierstrassP[1,1,I+1]//N Out= WeierstrassP[1., 1., 1. + 1. I] Can anyone explain this strange behavior? Please let me know if anyone has a package for calculation of elliptic functions in terms of torus periods rather then the coefficients of the cubic. Any help would be deeply appreciated. Alexander Belopolsky.