This uses implicit fortran conventions, that is integers for variables prefixed with i through n and reals for others
make_c_args(...)list of variable names, as is
make_c_args(no,ni,x,y,w,theta,ng,mg,aa,ne,nx,nlam,ulam,thr,maxit,verbose,ao,ia,kin,nlp,jerr)
#> [1] "int *no" "int *ni" "double *x" "double *y"
#> [5] "double *w" "double *theta" "int *ng" "int *mg"
#> [9] "double *aa" "int *ne" "int *nx" "int *nlam"
#> [13] "double *ulam" "double *thr" "int *maxit" "double *verbose"
#> [17] "double *ao" "int *ia" "int *kin" "int *nlp"
#> [21] "int *jerr"