Cliff Hansen

Test failure for `ubuntu-latest, 3.8, conda, -min` is because that environment installs scipy=1.6.0, which doesn't allow for constraints when using Nelder-Mead, so the optimizer gets a different, unsatisfactory, solution.

> Is the simplex solver required? Why not try Powell instead? @leliadeville

For context, here's the submitted paper. The main point is determining that optimization is preferred over two other techniques (functions currently in pvlib, and an approach that equates quantities that...

> This is a method of directly obtaining parameters without generating an IEC-61853 matrix as the go between first. I may be misunderstanding, but generating the IEC-61853 matrix data for...

@pvlib/pvlib-maintainer I am perplexed by the test failure. Test passes when I run it locally, and the results compare favorably when I look at the numbers. Is there some pvlib...

@echedey-ls thanks, after a little more investigation I figured it was configuration dependent. There's one parameter being estimated that's very sensitive to what must be round-off level differences.

In my opinion, validating a parameter estimation method should be done in a manner that demonstrates that the method has two properties: 1) the model fitting does not introduce a...

> The RMS value on the final figure for the _Fast simulation using the ADR efficiency model starting from PVsyst parameters_ gallery example in [the new docs](https://pvlib-python--2112.org.readthedocs.build/en/2112/gallery/adr-pvarray/plot_simulate_fast.html) is different to...

Any irradiance quantity could have a corresponding spectral variable. Broadband irradiance (a single number) is an integration over wavelength of a vector of wavelength-dependent values. I think the plane and...

+1 to `spectrum` for a general variable (not specific to plane or aperture of the measurement). Spectrum "is the intensity of light as it varies with wavelength or frequency." (Brittannica)....