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This question already has an answer here:

The following question is a logical continuation of this one. The Ted Ersek's RootSearch package doesn't work with this code:

Needs["Ersek`RootSearch`"];
Quiet@RootSearch[τ - ArcCos[1/(-11.` + 6.16949` E^(0.05` τ))]/
Sqrt[0.380626` + (0.08062600000000003` - 0.04130349999999999` E^(0.05` τ))/
(-1.` + 1.` E^(0.05` τ) - 0.25` E^(0.1` τ))] == 0, {τ, -5, 14}]

with error message:

Get::noopen: Cannot open Ersek`RootSearch`. >>
Needs::nocont: Context Ersek`RootSearch` was not created when Needs was evaluated. >>

Thank's for help!

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marked as duplicate by dr.blochwave, user9660, J. M. is away Nov 27 '15 at 11:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 1
    $\begingroup$ You don't have the package installed, go to this page and download the .m file and the example notebook. The notebook has a section on installation and will help you find out where to put the file. $\endgroup$ – Jason B. Nov 27 '15 at 9:40
  • $\begingroup$ Mathematica cannot open the file. Closely related (just for a different package): mathematica.stackexchange.com/q/28268/131. Tip: search the site for "was not created when Needs" or similar. $\endgroup$ – Yves Klett Nov 27 '15 at 9:52
  • $\begingroup$ On a related note, I installed the package and I get the error about setting the minprecision to negative infinity. I follow Jens's advice in the comment to this answer and replace the negative infinity by positive infinity in the package, and it now crashes my kernel. $\endgroup$ – Jason B. Nov 27 '15 at 9:52
  • $\begingroup$ Consider using any of the listed alternatives in the linked duplicate instead, so that you don't need to load an external package. $\endgroup$ – J. M. is away Nov 27 '15 at 11:38