DOC: docstring inconsistency in RectBivariateSpline

[mirca]

The docstring of the smoothing factor s of the class RectBivariateSpline mentions the vector w as part of the estimation condition:

scipy/scipy/interpolate/fitpack2.py

Line 1152 in 9053491

``sum((w[i]*(z[i]-s(x[i], y[i])))**2, axis=0) <= s``

However, it looks like the class RectBivariateSpline doesn't take w as input. I believe this is an inconsistency in the docstring?

[erheron]

Hi! I'm looking into this one now, and I've got a feeling that someone, long ago has copied this line from documentation of I don't know, UnivariateSpline class (just my guess), and now it's completely nonsense. I can't see w initialized or used nowhere up to root of inheritance. One more thing is that s is used only in one place:

scipy/scipy/interpolate/fitpack2.py

Line 1187 in ce0e23e

nx, tx, ny, ty, c, fp, ier = dfitpack.regrid_smth(x, y, z, xb, xe, yb,

and I literally can't find what does regrid_smth do. This w there is bug for sure

[rgommers]

Closing in favor of gh-11756. Thanks @mirca and @erheron