Of course I want to get a spline following exactly my points. I didn't even
think of combining two splines in one. I don't think it's possible.
For now because natural_spline doesn't give me solution I wonder how to connect
two separate straight lines with smooth curve as a part of of circle or
quadratic function in the way where you can not see where straight lines end
and curve begins. This is a mathematic problem that shouldn't be very complex.
So in the result I would like to create output points array - some kind of
spline substitution. Any ideas?

twister

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