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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