From 4bdb835c96ae6cae8f47b96ca4452b72b6ae2a98 Mon Sep 17 00:00:00 2001
From: Vladimir Agafonkin <agafonkin@gmail.com>
Date: Fri, 21 Sep 2018 17:58:15 +0200
Subject: [PATCH] fix log expressions in IE

closes #7318
---
 src/style-spec/expression/definitions/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/style-spec/expression/definitions/index.js b/src/style-spec/expression/definitions/index.js
index f39dc07639d..7248dfbb801 100644
--- a/src/style-spec/expression/definitions/index.js
+++ b/src/style-spec/expression/definitions/index.js
@@ -280,7 +280,7 @@ CompoundExpression.register(expressions, {
     'log10': [
         NumberType,
         [NumberType],
-        (ctx, [n]) => Math.log10(n.evaluate(ctx))
+        (ctx, [n]) => Math.log(n.evaluate(ctx)) / Math.LN10
     ],
     'ln': [
         NumberType,
@@ -290,7 +290,7 @@ CompoundExpression.register(expressions, {
     'log2': [
         NumberType,
         [NumberType],
-        (ctx, [n]) => Math.log2(n.evaluate(ctx))
+        (ctx, [n]) => Math.log(n.evaluate(ctx)) / Math.LN2
     ],
     'sin': [
         NumberType,