# igcop (development version)

# igcop 1.0.2

* Package-level documentation now accessible via `package?igcop`. 

# igcop 1.0.1

* Ensure specification of bd,eps,mxiter parameters match across all calls to the Newton Raphson algorithms.
* Add tests for `interp_gen_D1` at 0.
* Added package documentation.

# igcop 1.0.0

* The package now has a C++ backend, by converting the four Newton-Raphson algorithms and their dependencies from R to C++. 

Smaller changes:

* Renamed `tau` argument to `p` in IG and IGL quantile functions. 
* Removed `igl_gen_DD` and `igamma()` internal functions, which were not used for copula quantities.


# igcop 0.2.0

* Added a `NEWS.md` file to track changes to the package.
* Completed the collection of distributional quantities to match that of the CopulaModel package.
* Computations of quantile functions are now more robust. 
* Changed the parameterization of the copula families to make them more numerically stable.
    * Small values of the parameter `alpha` (previously = `k - 1`) are now reliable.
* Placed the theta and alpha parameters of the IG copula as their own arguments. 

# igcop 0.1.0

* Computational tools for IG and IGL copulas are now available, using the original parameterization of these copulas as defined in Coia (2017) thesis.
