new_contents: from pylab import *;
  import RungeKutta;
  
  def dummy(t, f, args):
  
      return zeros(f.shape);
  
  def dummyVel(f, args):
  
      return 1.3;
  
  u = zeros((10,10));
  v = zeros((10,10));
  z = zeros((10,10));
  
  delta = 0.1;
  
  
  stepfwd = RungeKutta.RungeKutta4(delta, dummy, dummy, dummyVel);
  
  tnew, fnew = stepfwd.integrate(0, [u,v,z]);
  
  print tnew;
  
subject: test script for RungeKutta