diff --git a/pkg/indicator/v2/rma.go b/pkg/indicator/v2/rma.go
index 1aa08ccdc..4a6c8b327 100644
--- a/pkg/indicator/v2/rma.go
+++ b/pkg/indicator/v2/rma.go
@@ -48,11 +48,6 @@ func (s *RMAStream) Calculate(x float64) float64 {
 	}
 	s.counter++
 
-	if s.counter < s.window {
-		// we can use x, but we need to use 0. to make the same behavior as the result from python pandas_ta
-		s.Slice.Push(0)
-	}
-
 	s.Slice.Push(tmp)
 	s.previous = tmp
 	return tmp
diff --git a/pkg/types/series_float64.go b/pkg/types/series_float64.go
index f12e05d58..8c07b4a13 100644
--- a/pkg/types/series_float64.go
+++ b/pkg/types/series_float64.go
@@ -46,6 +46,21 @@ func (f *Float64Series) Subscribe(source Float64Source, c func(x float64)) {
 	}
 }
 
+// AddSubscriber adds the subscriber function and push historical data to the subscriber
+func (f *Float64Series) AddSubscriber(fn func(v float64)) {
+	f.OnUpdate(fn)
+
+	if f.Length() == 0 {
+		return
+	}
+
+	// push historical values to the subscriber
+	for _, vv := range f.Slice {
+		fn(vv)
+	}
+}
+
+
 // Bind binds the source event to the target (Float64Calculator)
 // A Float64Calculator should be able to calculate the float64 result from a single float64 argument input
 func (f *Float64Series) Bind(source Float64Source, target Float64Calculator) {