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  1. R

    Mathematica Numerical solution in Mathematica

    The main problem is that, Mathematica tries to solve your problem analytically first. So it plugs in symbolic x, and your function can't handle it. Please refer to this question in" [Broken]...
  2. R

    Creating a function from DSolve output

    What you need to do is the following: sol = DSolve[{y'[x] == 3 + 1/x}, y, x] g = y /. sol[[1]] Please refer to this" [Broken] for detailed explanation.