get rid of const qualifier

stan-dev · Feb 11, 2020 · c4d39e4 · c4d39e4
1 parent f541961
commit c4d39e4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/stan/math/rev/functor/gradient.hpp b/stan/math/rev/functor/gradient.hpp
@@ -43,7 +43,7 @@ void gradient(const F& f, const Eigen::Matrix<double, Eigen::Dynamic, 1>& x,
               double& fx, Eigen::Matrix<double, Eigen::Dynamic, 1>& grad_fx) {
   start_nested();
   try {
-    const Eigen::Matrix<var, Eigen::Dynamic, 1> x_var(x);
+    Eigen::Matrix<var, Eigen::Dynamic, 1> x_var(x);
     var fx_var = f(x_var);
     fx = fx_var.val();
     grad_fx.resize(x.size());