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Original Message (ID '256838') By Markus:
In Response To 'Re: Solve equation(s) with a List as Variable' --------- Hi, thanks for your help. It looks already much better. I used the FindRoot version. Values for mag are in the order of E-8. The results look reasonable too (in the same range, if you choose some 1E-8 starting value it will work). But i still get an error: FindRoot::jsing: "Encountered a singular Jacobian at the point {x} = {10.1046}. Try perturbing the initial point(s)" Whats the problem here?