Implement gradient for SplineFunction. (idaholab#3312)

dschwen · Jul 1, 2014 · f027adf · f027adf
1 parent 8a967aa
commit f027adf
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diff --git a/framework/include/functions/SplineFunction.h b/framework/include/functions/SplineFunction.h
@@ -33,6 +33,8 @@ class SplineFunction : public Function
   virtual ~SplineFunction();
 
   virtual Real value(Real t, const Point & p);
+  virtual RealGradient gradient(Real t, const Point & p);
+
   virtual Real derivative(const Point & p);
   virtual Real secondDerivative(const Point & p);
 

diff --git a/framework/src/functions/SplineFunction.C b/framework/src/functions/SplineFunction.C
@@ -45,6 +45,14 @@ SplineFunction::value(Real /*t*/, const Point & p)
   return _ipol.sample(p(0));
 }
 
+RealGradient
+SplineFunction::gradient(Real /*t*/, const Point & p)
+{
+  RealGradient grad(0.0);
+  grad(0) = derivative(p);
+  return grad;
+}
+
 Real
 SplineFunction::derivative(const Point & p)
 {