Creating a function from DSolve output

[rasouza]

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

 

[ross_tang]

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/" for detailed explanation.