Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 4000 by [email protected]: Geometric Algebra - gradient of an exponential
http://code.google.com/p/sympy/issues/detail?id=4000

Hi team,

With git version of sympy (to be the 0.7.4 release), I don't understand the following results for the attached script :

my exponential = exp(-E*gamma_w*t)
-E*gamma_w*exp( -E*gamma_w*t )*gamma_t = E*exp(-E*gamma_w*t)*gamma_t^gamma_w

grad*(my exponential) = -E*gamma_w*exp(-E*gamma_w*t)*gamma_t
grad*(my exponential)+E*gamma_w*(my exponential)*gamma_t = -E*gamma_w*exp(-E*gamma_w*t)*gamma_t - E*exp(-E*gamma_w*t)*gamma_t^gamma_w

Is it a correct value for the gradient ?

Attachments:
        bug_grad_exp.py  1.4 KB

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