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  • $\begingroup$ Thanks a lot, it works! Is it possible to correct this function and not to use interpolation? I'd like to get only values of phi. Sorry if it is a very foolish and simple question, I have never worked with manual functions before. $\endgroup$ Commented Aug 12, 2016 at 14:22
  • $\begingroup$ @Chertan I'm not sure if this is exactly what you mean by correcting this function, but you can extract particular values of \[Phi] like this: \[Phi][1] /. tr gives -0.506903. $\endgroup$ Commented Aug 13, 2016 at 1:39
  • $\begingroup$ yes, that's exactly what I meant. Thank you! $\endgroup$ Commented Aug 13, 2016 at 13:42