Hello, i think that my question is simple one, but i have not found answer in the reference manual. I need a function of vector variables. For example: var("x1,x2,x3") x=vector([x1,x2,x3]) Is it possible to define a function of the vector variable "x", something like this: f(x)=sum(x[i]*x[i]for i in range(3)) ?
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