Fit points to curve with zero slope

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Niclas Madsen
Niclas Madsen 2018-8-21
编辑： Torsten 2018-8-21
Hi
I have to fit a set of coordinates (two points) to a linear slope, however, in one case I know the slope is 0. I'm using polyfit.
polyfit([x1 x2], [y1 y2], 1)
This returns a slope coefficient of -263.0023e-018.
I know the slope for this specific case is 0, but I want to make my script able to handle changes to input, which is why I don't want to manually change the slope coefficient. While e-018 might be accurate enough for the task at hand, I'd like to be able to do it correctly.
So how do I fit two points to a linear curve where the slope is 0?

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Torsten
Torsten 2018-8-21
编辑：Torsten 2018-8-21
The polynomial is given by
p = (sum_{i=1}^{n} yi) / n
where
(x1,y1), (x2,y2), ..., (xn,yn)
are the given data points.
In your case:
p = (y1+y2)/2
Best wishes
Torsten.

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