Update tab.h

includes/tab.h

@@ -43,6 +43,7 @@ class Materiaux
 
 };
 
+vector<double> sum_vect(vector <double> T,vector <double> F);
 vector<double> resolution(double lambda, vector<double> T);
 void settab(Materiaux mat, int u0, double f);
 void settab2D(Materiaux mat, int u0, double f);