if you just want a straight C NNLS implementation, I have this. https://github.com/EESI/quikr/blob/master/src/c/nnls.c
see quikr.c On Thu, 18 Apr 2019 at 00:32, Marco Maggi <marco.maggi-i...@poste.it> wrote: > > Lawrence Habahbeh wrote: > > > Hi, > > > In the online > > [Docs](https://www.gnu.org/software/gsl/doc/html/index.html) ยป > > Nonlinear Least-Squares Fitting, there is an example of fitting an > > exponential function to data. The data object is a structure with > > three arguments > > struct data { > > size_t n; > > double *t; > > double *y; > >> ; > > > Can you please show me how to read the data from a text file and run > > the optimization as is. . The data is a column vector with daily > > observations and T = 120000 points . > > About the data, start by toying with this: > > https://gist.github.com/marcomaggi/8530cf839f462078eb4e5f33255b6663 > > -- > Marco Maggi >
