Hello.
I'll try to use lbfgs and got this:
===================[cut]============================================
(%i2) V: 0.75$
a: 24$
b: 68$
C(r) := 2*%pi*b*r^2 + 4*a*%pi*r + 2*b*V/r + a*V/(%pi*r^2)$
lbfgs(C(r), [r], [1.0], 1e-4, [1,0]);
(%i3)
(%i4)
(%i5)
(%i6) *************************************************
N= 1 NUMBER OF CORRECTIONS=25
INITIAL VALUES
F= 8.365790735841403D+02 GNORM= 1.042646940618427D+03
*************************************************
I NFN FUNC GNORM STEPLENGTH
Maxima encountered a Lisp error:
Error in NTH [or a callee]: T is not of type SYSTEM::PROPER-LIST.
Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.
(%i7)
===================[cut]============================================
What am I doing wrong?