Hello all,
someone can help me with this little script??
when I try with this f(x,y):
(x+y-3)*exp(x*y)
it crash!!
I'm a newbie just started learning some script with python.
thank u !!
import sympy
from sympy import *
x = sympy.Symbol('x')
y = sympy.Symbol('y')
f = input("write f(x,y) :")
print "f(x,y): ", 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)
z = sympy.diff(a, x)
print "La derivata seconda in xx:"
sympy.pprint(z)
k = sympy.diff(b, y)
print "La derivata seconda in yy:"
sympy.pprint(k)
q = sympy.diff(a, y)
print "La derivata seconda in xy:"
sympy.pprint(q)
u = sympy.diff(b, x)
print "La derivata seconda in yx:"
sympy.pprint(u)
print "I punti critici sono:"
p = sympy.solve([a, b], [x, y])
print p
H = sympy.hessian(f, [x,y])
print "La matrice Hessiana :"
print H
D = H.det()
print "Il determinante dell'Hessiana:"
print D
##here when I run the script:
scrivi la funzione :(x+y-3)*exp(x*y)
hai scritto: -(3 - x - y)*exp(x*y)
La derivata prima in x:
x*y x*y
- y*(3 - x - y)*e + e
La derivata prima in y:
x*y x*y
- x*(3 - x - y)*e + e
La derivata seconda in xx:
x*y 2 x*y
2*y*e - y *(3 - x - y)*e
La derivata seconda in yy:
x*y 2 x*y
2*x*e - x *(3 - x - y)*e
La derivata seconda in xy:
x*y x*y x*y x*y
x*e + y*e - (3 - x - y)*e - x*y*(3 - x - y)*e
La derivata seconda in yx:
x*y x*y x*y x*y
x*e + y*e - (3 - x - y)*e - x*y*(3 - x - y)*e
I punti critici sono:
Traceback (most recent call last):
File "E:\unico_2.py", line 36, in <module>
p = sympy.solve([a, b], [x, y])
File "C:\Python25\Lib\site-packages\sympy\solvers\solvers.py", line
272, in solve
raise NotImplementedError()
NotImplementedError
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