From 3ebedb111004ac97378ab497a8636b86c45296bd Mon Sep 17 00:00:00 2001
From: bl <bl@reborn.jediinc>
Date: Mon, 3 Jul 2017 21:29:38 -0700
Subject: [PATCH] Use abs for scaling y

---
 R/R/prophet.R                  | 2 +-
 python/fbprophet/forecaster.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/R/R/prophet.R b/R/R/prophet.R
index 5b2dd81..93dc61b 100644
--- a/R/R/prophet.R
+++ b/R/R/prophet.R
@@ -226,7 +226,7 @@ setup_dataframe <- function(m, df, initialize_scales = FALSE) {
     dplyr::arrange(ds)
 
   if (initialize_scales) {
-    m$y.scale <- max(df$y)
+    m$y.scale <- max(abs(df$y))
     m$start <- min(df$ds)
     m$t.scale <- as.numeric(max(df$ds) - m$start)
   }
diff --git a/python/fbprophet/forecaster.py b/python/fbprophet/forecaster.py
index 4175026..a928bd1 100644
--- a/python/fbprophet/forecaster.py
+++ b/python/fbprophet/forecaster.py
@@ -179,7 +179,7 @@ class Prophet(object):
         df.reset_index(inplace=True, drop=True)
 
         if initialize_scales:
-            self.y_scale = df['y'].max()
+            self.y_scale = df['y'].abs().max()
             self.start = df['ds'].min()
             self.t_scale = df['ds'].max() - self.start