FindRoot: Failed to converge to the requested accuracy - CORRECTION

*To*: mathgroup at smc.vnet.net*Subject*: [mg57464] FindRoot: Failed to converge to the requested accuracy - CORRECTION*From*: <topolog at gazeta.pl>*Date*: Sat, 28 May 2005 05:40:24 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Dear Mathematica Users, This is a valid part of a code that provides shooting method to solve equation EQJ = J1(W,z)*v(z) + J2(W,z)*v'(z) + J3(W,z)*v''(z) == 0 (--THIS IS THE CORRECT FORM!!--) with W - an eigenvalue: dYdX[W_?NumericQ] := EQJ; (* the equation *) Y1X1[W_?NumericQ] := {v[z1] == BCV1, v'[z2] == BCV2}; (* boundary conditions, BCV2 is W-dependent *) eqset[W_?NumericQ] := Join[{dYdX[W] == 0.}, Y1X1[W]]; (* the set of the above *) (* function that solves eqset for the specified W *) ndsolut[W_?NumberQ] := NDSolve[eqset[W], v, {z, z1, z2}][[1, 1, 2]]; (* searching for W that satisfies another boundary condition *) FindRoot[ndsolut[W][z2] == BCV3, {W, W1, W2}] While in version 4.0 of Mathematica similar code was able to find solutions quickly and accurately, the 5.1 version breaks after 100 iterations in FindRoot: FindRoot::cvmit: Failed to converge to the requested accuracy or precision within 100 iterations Any sugestion, please. Rafal Kosinski P.S. The J-functions are rather complex so I do not present them here. They are dependent of z-coordinate through InterpolatingFunction[{{0., 3000.}}, <>][z] and of W in powers from 1 to 10.

**Follow-Ups**:**Re: FindRoot: Failed to converge to the requested accuracy - CORRECTION***From:*Chris Chiasson <chris.chiasson@gmail.com>