[SciPy-Dev] Bug in place_poles

[Irvin Probst]

Hi,
FYI there is a bug in place_poles, the return values rtol and nb_iter 
are supposed to be np.nan when there is nothing to optimize and 0 when 
the solution is unique but the function does it the other way around.
Note that the doc contains an error too, it is stated:

rtol will be NaN if the optimisation algorithms can not run, i.e when 
B.shape[1] == 1, or 0 when the solution is unique.

But one should read:

rtol will be NaN if the optimisation algorithms can not run,  or 0 when 
the solution is unique i.e when B.shape[1] == 1.

I'll fix this ASAP, in the meantime please consider this bug as already 
acknowledged if anyone reports it.

Regards.

-- 
Irvin

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