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 . Kind regards, Sent with [ProtonMail](https://protonmail.com) Secure Email.
