RKmain running
solving RKuser ordinary differential equation
xmin=1.0, xmax=2.0, y=1.0, h=0.1
y' = f(x,y) = 2.0
  x                     y
1.0    1.0
1.1    1.2210252083333333
1.2000000000000002    1.4884158636814235
1.3000000000000003    1.809151675411352
1.4000000000000004    2.1909464147407602
1.5000000000000004    2.642325116634392
1.6000000000000005    3.1727094010884285
1.7000000000000006    3.7925117677254
1.8000000000000007    4.51323980743022
1.9000000000000008    5.34761137401083
2.000000000000001    6.309681868558361