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Runge-kutta vs euler

  1. Jul 21, 2008 #1
    Hi, I dunno if this is the right forum to adress, but I will try nevertheless
    Im solving a simple two-dimensional differential equation:

    dx/dt = (-y,x)

    which will give a circle when integrating over time.

    Now, the problem is that the simple euler scheme seems to be a lot more precise than the runge-kutta fourth order method. I've spend two whole days trying to debug my code and I feel stuck. so, are there some special cases where rk is worse than euler -- or is there no other explanation than I have made a mistake somewhere (it's four lines of code and my supervisors have had a look without the error popping up.)
  2. jcsd
  3. Jul 21, 2008 #2
    great monday... just after complaining in here i found that Ive messed an extra time-increment in somewhere in the code :p sorry for the inconvenience
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