From bd50ef4ad8dc96cc2139ffa3095762f6b27e8700 Mon Sep 17 00:00:00 2001
From: su530201 <olivier.kaufmann@umons.ac.be>
Date: Tue, 27 Jun 2023 15:25:13 +0200
Subject: [PATCH] Tests sp

---
 ohmpi/hardware_system.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index c787a0c3..dc36150d 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -234,7 +234,7 @@ class OhmPiHardware:
                 mean_iab.append(np.mean(self.readings[self.readings[:, 1] == i, 3]))
             mean_vmn = np.array(mean_vmn)
             mean_iab = np.array(mean_iab)
-            sp = np.mean(mean_vmn[np.ix_(polarity == 1)] - mean_vmn[np.ix_(polarity == -1)]) / 2
+            sp = np.mean(mean_vmn[np.ix_(polarity == 1)] + mean_vmn[np.ix_(polarity == -1)]) / 2
             return sp
 
     def _compute_tx_volt(self, pulse_duration=0.1, strategy='vmax', tx_volt=5,
-- 
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