For easier low-level math-ish programming, I chose to learn Fortran. Actually, it is the free, GFortran implementation of Fortran 90. And it ran very fast! It could calculate the Euler-Mascheroni constant in up to 2,147,483,647 iterations quickly.

Using a simple method, I tried to numerically solve a non-linear second-order ODE... Well, actually it is a pendulum motion with a large amplitude. It solves and produces the time versus angle data in a blink with a fair precision (d

*t*= .01 s)...Out of the box, GNU Emacs integrates nicely with GFortran, with code highlighting and debugging (I haven't tried the debugging yet).