>>> from __future__ import division ... ... from sympy import * ... from
sympy.tensor import IndexedBase, Idx ... ... a, b = symbols('a b') ...
F_tensor = symbols('F_tensor', cls=Function)
... ... i = map(Idx, ['i']) ... ... x = IndexedBase('x') ... y =
IndexedBase('y') ...
>>> F_tensor = (y[i] - (b*x[i]+a))**2
>>> F_tensor
(−a−bx[i]+y[i])2
>>> diff(F_tensor, b)
−2(−a−bx[i]+y[i])2 x[i](−a−bx[i]+y[i])−1
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