Ivan Pribec

In the case `norm2` is not available, I would probably just link it as an external function: ```fortran #if NO_F2008_NORM2 external :: norm2 #else intrinsic :: norm2 #endif ``` One...

A quick grep shows there are 43 occurrences where `enorm` appears on the right-hand side: ```text $ grep -n .*=.*enorm\(.*\) minpack.f90 282: qnorm = enorm(n, Wa2) 301: gnorm = enorm(n,...

Before I forget, the two instances: ``` 3270: ajnorm = enorm(m - j + 1, a(j, j)) 3296: Rdiag(k) = enorm(m - j, a(jp1, k)) ``` can be rewritten as...

I checked the [history](https://github.com/scipy/scipy/commits/main/scipy/optimize/minpack) of that folder. The only major change is they added the `recursive` attribute to all subroutines to make sure they are re-entrant. The relevant issue is...

Here's a list of things we could try to improve on based upon [a search of the open issues containing the keyword "minpack"](https://github.com/scipy/scipy/issues?q=is%3Aissue+is%3Aopen+minpack) in the SciPy repository: * Robust handling...

Perhaps more relevant than issues directly related to MINPACK is to look directly at the options available with other solvers in [`scipy.optimize.leastsq`](https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.least_squares.html#scipy.optimize.least_squares) and [`scipy.optimize.root`](https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.root.html#scipy-optimize-root). For least squares, the features missing...

By edge cases, do you mean for examples things like NaN or infinity in the initial guess? I believe that MINPACK currently doesn't perform such checks. The question is whether...

There are a number of test collections including ill-conditioned problems. We have issues open for a few (#10, #35) of them. Here are a few original references: * [An Evaluation...

Is there any overlap with the problems located here: http://www.netlib.org/uncon/data/? (a list of names can be found in the readme at http://www.netlib.org/uncon/data/readme)

I think the same problems are also used in the CodeLib library (http://elib.zib.de/pub/elib/codelib/en/misc.html) under "Newton TestSet".