elnet_coord: Elastic Net
In xw547/hwpkg:

A function that implements the algorithm proposed by (Zou, Hui; Hastie, Trevor, 2015, JRRSB).

elnet_coord(
  y,
  X,
  beta0 = NA,
  alpha = 0,
  lambda = 0,
  niter = 10000,
  tol = 1e-05
)

`y`	The constant vector
`X`	The regressor
`beta0`	The initial guess of the solution. If no input given, then it is set to a zero vector.
`alpha`	The elastic net parameter, alpha should be in [0,1]. More details to be found in Trevors paper.
`lambda`	Regularization parameter
`niter`	Maximum Number of Iteration
`tol`	Tolerance of the difference between two result from iteration