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