diff --git a/lib/graphic/mathgl_dens.cpp b/lib/graphic/mathgl_dens.cpp
index 04b8451..b12a295 100644
--- a/lib/graphic/mathgl_dens.cpp
+++ b/lib/graphic/mathgl_dens.cpp
@@ -83,8 +83,8 @@ int gctl::mathgl_dens::Draw(mglGraph *gr)
         for (size_t j = 0; j < xnum_; j++)
         {
             z_d.a[j + i*xnum_] = z_[j + i*xnum_];
-            zmin = std::min(zmin, z_[j + i*xnum_]);
-            zmax = std::max(zmax, z_[j + i*xnum_]);
+            zmin = GCTL_MIN(zmin, z_[j + i*xnum_]);
+            zmax = GCTL_MAX(zmax, z_[j + i*xnum_]);
         }
     }
 
diff --git a/lib/graphic/mathgl_plot.cpp b/lib/graphic/mathgl_plot.cpp
index 749f2a2..28f054d 100644
--- a/lib/graphic/mathgl_plot.cpp
+++ b/lib/graphic/mathgl_plot.cpp
@@ -49,7 +49,7 @@ void gctl::mathgl_plot::add_profile(const array<double> &in_y, std::string y_lab
     if (xnum_ != in_y.size())
         throw std::runtime_error("[gctl::mathgl_plot] Invalid profile data size.");
 
-    ys_.append_array(in_y);
+    ys_.concat(in_y);
     y_ll_ = y_label;
     ynum_++;
     return;
@@ -65,8 +65,8 @@ int gctl::mathgl_plot::Draw(mglGraph *gr)
     double mini = ys_.front(), maxi = ys_.front();
     for (size_t i = 1; i < ys_.size(); i++)
     {
-        mini = std::min(mini, ys_[i]);
-        maxi = std::max(maxi, ys_[i]);
+        mini = GCTL_MIN(mini, ys_[i]);
+        maxi = GCTL_MAX(maxi, ys_[i]);
     }
 
     gr->SetSize(800, 400);