diff --git a/apps/shared/function_app.cpp b/apps/shared/function_app.cpp
index 298f018d2..41efe2b44 100644
--- a/apps/shared/function_app.cpp
+++ b/apps/shared/function_app.cpp
@@ -15,9 +15,7 @@ FunctionApp::Snapshot::Snapshot() :
 }
 
 void FunctionApp::Snapshot::reset() {
-  m_interval.setStart(0);
-  m_interval.setEnd(10);
-  m_interval.setStep(1);
+  m_interval.reset();
   m_indexFunctionSelectedByCursor = 0;
   m_modelVersion = 0;
   m_rangeVersion = 0;
diff --git a/apps/shared/interval.cpp b/apps/shared/interval.cpp
index 5731de680..047c94d3c 100644
--- a/apps/shared/interval.cpp
+++ b/apps/shared/interval.cpp
@@ -4,12 +4,9 @@
 namespace Shared {
 
 Interval::Interval() :
-  m_numberOfElements(0),
-  m_start(0.0),
-  m_end(10.0),
-  m_step(1.0),
-  m_needCompute(true)
+  m_numberOfElements(0)
 {
+  reset();
 }
 
 int Interval::numberOfElements() {
@@ -55,6 +52,13 @@ void Interval::setElement(int i, double f) {
   }
 }
 
+void Interval::reset() {
+  m_start = 0.0;
+  m_end = 10.0;
+  m_step = 1.0;
+  m_needCompute = true;
+}
+
 void Interval::computeElements() {
   if (!m_needCompute) {
     return;
diff --git a/apps/shared/interval.h b/apps/shared/interval.h
index edca86274..54bd946f7 100644
--- a/apps/shared/interval.h
+++ b/apps/shared/interval.h
@@ -18,6 +18,7 @@ public:
   void setEnd(double f);
   void setStep(double f);
   void setElement(int i, double f);
+  void reset();
   // TODO: decide the max number of elements after optimization
   constexpr static int k_maxNumberOfElements = 100;
 private: