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I am using Mathematica 9.0 on Ubuntu.

I tried the first example from this documentation page, but it returns unevaluated:

Needs["DifferentialEquations`NDSolveProblems`"];
Needs["DifferentialEquations`NDSolveUtilities`"];

NDSolve`ImplicitRungeKuttaGaussCoefficients[4, 50]

(* ==> NDSolve`ImplicitRungeKuttaGaussCoefficients[4, 50] *)

What is the problem ?

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You may have a broken installation. First restart Mathematica and try again. If that doesn't solve the problem, please evaluate $Path in a newly started Mathematica instance and update your question with the result. Also post the precise error message you get when you evaluate these Needs. –  Szabolcs Dec 6 '13 at 18:41
    
Advanced thanks for post. But, I don't get any error after proccessing Needs. –  drxy Dec 6 '13 at 20:21
    
And my $Path results are as follows "/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Links", \ "/root/.Mathematica/Kernel", "/root/.Mathematica/Autoload", \ "/root/.Mathematica/Applications", "/usr/share/Mathematica/Kernel", \ "/usr/share/Mathematica/Autoload", \ "/usr/share/Mathematica/Applications", ".", "/root", –  drxy Dec 6 '13 at 20:22
    
"/usr/local/Wolfram/Mathematica/9.0/AddOns/Packages", \ "/usr/local/Wolfram/Mathematica/9.0/AddOns/LegacyPackages", \ "/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Autoload", \ "/usr/local/Wolfram/Mathematica/9.0/AddOns/Autoload", \ "/usr/local/Wolfram/Mathematica/9.0/AddOns/Applications", \ "/usr/local/Wolfram/Mathematica/9.0/AddOns/ExtraPackages", \ "/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Kernel/Packages", –  drxy Dec 6 '13 at 20:23
    
"/usr/local/Wolfram/Mathematica/9.0/Documentation/English/System", \ "/usr/local/Wolfram/Mathematica/9.0/SystemFiles/Data/ICC"} –  drxy Dec 6 '13 at 20:23
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1 Answer

up vote 6 down vote accepted

This example works in version 8, but in version 9 it does indeed fail to evaluate.

I did a little bit of spelunking to find out why. It turns out that in version 9 this function (as well as related ones) takes a third argument. I believe this third argument is just a symbol that will be used as the head in any messages that might be reported. Maybe this change was done because version 9 has four different NDSolve-related functions (compared to v8): NDSolve, NDSolveVaule, ParametricNDSolve and ParametricNDSolveValue.

The simple workaround is to just pass NDSolve as the third argument:

NDSolve`ImplicitRungeKuttaGaussCoefficients[4, Infinity, NDSolve]

(* ==> {{{1/4, 1/12 (3 - 2 Sqrt[3])}, {1/12 (3 + 2 Sqrt[3]), 1/4}}, {1/2, 1/2}, {1/6 (3 - Sqrt[3]), 1/6 (3 + Sqrt[3])}} *)
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Very very very much thanks to solve my problem. You approach my mistakes very kindly. So thanks again. –  drxy Dec 7 '13 at 13:31
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