On 5/5/2009 8:23:13 AM, YuK wrote: >Hi All. > >http://en.wikipedia.org/wiki/R >unge-Kutta > >We know Runge-Kutta metod 4-th >Order Approximation has 4-th >Order Approximation. How to >view this by Mathkad? > >Thanks. >YuK _____________________________
Not sure what you are looking for, YuK Here is also Fehlberg 45.
On 5/5/2009 8:23:13 AM, YuK wrote: >We know Runge-Kutta metod 4-th >Order Approximation has 4-th >Order Approximation. How to >view this by Mathkad?
Is 4th global, but that's only because is 5th local. You can see that with the 'symbolic not found' for a serie of order 5 in your setup.
To evaluate the local error, you starting acotating the value e = |yn+1-yn|. To do that, assume at first that yn have not error! (which is absolutely false).
