Re: [Help-gsl] non-equal spacing data in nonlinear least squares fitting

[Patrick Alken]

You would provide the t_i values in the "struct data" parameter in that 
example. So you could add another array: double * t; into struct data 
and supply your t values in there.

Patrick

On 12/10/2015 11:06 AM, Xeelee Xeelee wrote:
> Hi,
>
> I need to fit a data set in the form of { t ,f(t) }
> (t is the argument f(t) is the value of function at t):
>
> t_0, y_0
> t_1,  y_1
> ...  ,  ...
> t_n,  y_n
>
> but the t_i is not equally spaced, e.g.
> T_my = {t_0, t_1, t_2, ...} = {0.1, 0.2, 0.4, 0.45, 0.7, 1.1, 1.21, ...}
>
> In the example program:
> http://www.gnu.org/software/gsl/manual/gsl-ref.html#Example-programs-for-Nonlinear-Least_002dSquares-Fitting
>
> The input data is simply in the form
> T_eg = {t_0, t_1, t_2, ...} = {0, 1, 2, 3, 4, 5, 6, 7, ....}
> and {y_0,....,y_n}
>
> Is there any place to provide T_my to the fitting program?
>
> Thanks a lot,
>
> X.N.