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Creating a function from DSolve output

  1. Jun 18, 2010 #1
    I have discovered the solution for the differential equation. I have:

    DSolve[{y'[x] == 3 + 1/x}, y, x]

    and got
    {{y -> Function[{x}, 3 x + C[1] + Log[x]]}}

    I'd like to make y a function of z, for example. I just would like to be able to use the function another time, evaluating y[2] for example.

    I tried a[x_] = DSolve[{y'[x] == 3 + 1/x}, y, x] but failed
  2. jcsd
  3. Jun 18, 2010 #2
    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 http://www.voofie.com/content/81/how-to-use-the-output-from-mathematica-function-dsolve/" [Broken] for detailed explanation.
    Last edited by a moderator: May 4, 2017
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