dfp_min  - dfp from numerical recipes
frpr_min - frpr from numerical recipes
maxlik   - general optimization routine
pow_min  - powell from numerical recipes
optsolv  - general optimization routine

optim1_d  - dfp,frpr,pow,maxlik demo
optim2_d  - optsolv demo
optim3_d  - fmins demo

apprgrdn   - computes gradient for optsolv
box_like1  - used by optim3_d
gradnt     - computes gradient
gradt      - computes gradient
stepsize   - computes stepsize
hessian    - evaluates hessian
linmin     - line minimization dfp,frpr,pow
tol_like1  - used by optim1_d,optim2_d
updateh    - updates hessian