#include <RcppArmadillo.h>
// [[Rcpp::depends(RcppArmadillo)]]
using namespace arma;

// [[Rcpp::export]]
vec nicelr (vec y, mat x) {
  vec beta_hat = solve(x.t() * x, x.t() * y);
  return beta_hat;
}

/*** R
x = cbind(rep(1,5),1:5); y = x %*% c(1,2) + rnorm(5)
nicelr(y, x)
*/