Internal mpath functions

These are not intended for use by users. `findlam`

is to compute the maximum value of `lambda`

so that the coefficient estimation is zero. `g`

is to compute a link function (not used at this moment), `init`

is to compute eta, which is the estimated beta_0 in the intercept-only model. `pen_sum`

is to compute the total penalty value from the estimated coefficients, `llfun`

to compute the log-likelihood function. `convexMin`

(from ncvreg) calculates the lowest index for which the penalized objective function is locally convex.

Functions not used anymore: pen_eval, pen_sum, pen_zipath

Zhu Wang and author of ncvreg (see COPYRIGHTS)

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