Please provide complete code to reproduce. The following works for me.
```
sage: x = vector((4.00810430656697, 19.9617665490168, -4.87852077236756))
sage: f(s) = x[0] * s^0 + x[1] * s^1 + x[2] * s^2
sage: plot(f(s), (s, 0, 2))
Launched png viewer for Graphics object consisting of 1 graphics primitive
```

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