From 12a93eafb02418c74907c57516c4f7a9c8e0c982 Mon Sep 17 00:00:00 2001
From: Fabian Joswig <fabian.joswig@ed.ac.uk>
Date: Mon, 6 Dec 2021 10:54:06 +0000
Subject: [PATCH] feat: performance of export to jackknife improved

---
 pyerrors/obs.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pyerrors/obs.py b/pyerrors/obs.py
index 5570f509..c1fcc8ca 100644
--- a/pyerrors/obs.py
+++ b/pyerrors/obs.py
@@ -623,9 +623,9 @@ class Obs:
         name = self.names[0]
         full_data = self.deltas[name] + self.r_values[name]
         n = full_data.size
-        mean = np.mean(full_data)
+        mean = self.value
         tmp_jacks = np.zeros(n + 1)
-        tmp_jacks[0] = self.value
+        tmp_jacks[0] = mean
         tmp_jacks[1:] = (n * mean - full_data) / (n - 1)
         return tmp_jacks