From d6bcab29201289d86a0d32a9d7fa57fe2e2855b0 Mon Sep 17 00:00:00 2001
From: joba-1 <32450554+joba-1@users.noreply.github.com>
Date: Wed, 5 Aug 2020 23:42:34 +0200
Subject: [PATCH] Fix ln(x) via taylor series for special case x = 1

---
 tasmota/support_float.ino | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tasmota/support_float.ino b/tasmota/support_float.ino
index b99b95cd2..697f673a3 100644
--- a/tasmota/support_float.ino
+++ b/tasmota/support_float.ino
@@ -116,6 +116,7 @@ double TaylorLog(double x)
   // https://stackoverflow.com/questions/46879166/finding-the-natural-logarithm-of-a-number-using-taylor-series-in-c
 
   if (x <= 0.0) { return NAN; }
+  if (x == 1.0) { return 0; }
   double z = (x + 1) / (x - 1);                              // We start from power -1, to make sure we get the right power in each iteration;
   double step = ((x - 1) * (x - 1)) / ((x + 1) * (x + 1));   // Store step to not have to calculate it each time
   double totalValue = 0;