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to_r

        # Complex.to_r

(from ruby core)
---
    cmp.to_r  ->  rational

---

Returns the value as a rational if possible (the imaginary part should
be exactly zero).

    Complex(1, 0).to_r    #=> (1/1)
    Complex(1, 0.0).to_r  # RangeError
    Complex(1, 2).to_r    # RangeError

See rationalize.



      

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