thank you for the answer
I found the error "solve_system" instead of "solve"!!
but now how I can pass every couple of critical point to the hessiana,
and take determinant?
this is my script now:
import sympy
x = sympy.Symbol('x')
y = sympy.Symbol('y')
f = input("scrivi la funzione :")
print "hai scritto: ", f
a = sympy.diff(f, x)
print "La derivata prima in x:"
sympy.pprint(a)
b = sympy.diff(f, y)
print "La derivata prima in y:"
sympy.pprint(b)
print "I punti critici sono:"
print sympy.solve([a, b], [x, y])
H = sympy.hessian(f, [x,y])
print "La matrice Hessiana :"
print H
print "Il determinante dell'Hessiana:"
print H.det()
p.s.
ciao riccardo grazie mille
รจ la prima volta in assoluto che programmo scusami per le numerose
richieste di aiuto!!
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