From e529a3271d87b3abcb0ed369c5a527751af5460a Mon Sep 17 00:00:00 2001
From: c9s <yoanlin93@gmail.com>
Date: Mon, 12 Jun 2023 17:38:17 +0800
Subject: [PATCH] indicator: fix ewma2 initial value

---
 pkg/indicator/v2_ewma.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/indicator/v2_ewma.go b/pkg/indicator/v2_ewma.go
index 45a15d7ca..16feb9901 100644
--- a/pkg/indicator/v2_ewma.go
+++ b/pkg/indicator/v2_ewma.go
@@ -19,6 +19,10 @@ func EWMA2(source Float64Source, window int) *EWMAStream {
 
 func (s *EWMAStream) Calculate(v float64) float64 {
 	last := s.slice.Last(0)
+	if last == 0.0 {
+		return v
+	}
+
 	m := s.multiplier
 	return (1.0-m)*last + m*v
 }