You may use this program for c personal, educational or research purposes.
Commercial purposes require c special arrangements.
If you publish a paper that depends upon this code, c please cite it appropriately. This is exact for c any isotropic-metric cosmology consistent with General Relativity. Integrate starting c value y from a to b with accuracy eps, storing intermediate results in c global variables. This general-purpose c choice can be modified if need be. If stepsize overshoots, decrease it.