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Yes, "n" can be other than 4, but I'm using that value because I'm introducing 4 differential equations.

Thanks for your comments and your help Smile

km=k-1
err(km)=(errmax/SAFE1)**(1.0_sp/(2*km+1))
end if
if (k/=1 .and. (k>=kopt-1 .or. first)) then
if (errmax < 1.0) exit main_loop
...

Thanks John and Davidb for your comments. I followed what you've told me, and I could solve the problem, but it appeared another one related to a function declared in the nrutil file named assert_eq. ...

I had a look at the code you have posted and wonder how have you declared derivs as being an external function in PROGRAM Bulirsch_Stoer .

You appear to have declared it as such in subroutine bsste ...

The most often cause of stack overflow is large local arrays.
This can be overcome by transferring these arrays from the stack to other memory areas.
Options include:
a) declare arrays in common or ...

Hi. I'm having troubles with my code. I'm using Numerical Recipes subroutines in my program but at the time of execute the program, I have the following error:

SALFORD RUN-TIME LIBRARY
Stack overf ...