> Thank you! - that does explain the error. > > If I convert back within the function (as below) , it eliminates the error > message, and also seems to work in my "real" problem. Are there better > ways to do this "conversion back" (to something compatible with symbolic > expressions) than using RealField? > > from mpmath import * > def f(a,b): > a=RealField(100)(a) > c=x-a > return a-2, b-3 > print findroot(f, (5, 6)) > >
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