Here is an example of fitting a quadratic polynomial to a dataset: https://www.gnu.org/software/gsl/doc/html/lls.html#multi-parameter-linear-regression-example
You should be able to adapt it to a 3rd order polynomial. On 04/28/2017 07:00 AM, Sumit Adhikari wrote: > Hello All, > > I am not a mathematician! > > I have Input vs Output Data for an unknown system. I want to find out the > coefficient of a third order polynomial which fits the data. > > Anybody please help me where to start using gsl? > > Thanks in advance. >
