From: W. Trevor King <wking@drexel.edu>
Date: Fri, 20 Aug 2010 11:03:50 +0000 (-0400)
Subject: Convert JPK deflection sign to follow Hooke convention.
X-Git-Url: http://git.tremily.us/?p=hooke.git;a=commitdiff_plain;h=ed4b22024590cbd929bb60c56d7804ef3f1b48d6

Convert JPK deflection sign to follow Hooke convention.
---

diff --git a/hooke/driver/jpk.py b/hooke/driver/jpk.py
index 7b33c5b..39717ef 100644
--- a/hooke/driver/jpk.py
+++ b/hooke/driver/jpk.py
@@ -201,6 +201,11 @@ class JPKDriver (Driver):
             if name == 'vDeflection':
                 assert unit == 'm', segment.info['columns'][i]
                 segment.info['columns'][i] = join_data_label('deflection', 'm')
+                # Invert because deflection voltage increases as the
+                # tip moves away from the surface, but it makes more
+                # sense to me to have it increase as it moves toward
+                # the surface (positive tension on the protein chain).
+                segment[:,i] *= -1
             elif name == 'height':
                 assert unit == 'm', segment.info['columns'][i]
                 segment.info['columns'][i] = join_data_label('z piezo', 'm')