Remove differentiation reference from difference's column argument help.

diff --git a/hooke/plugin/curve.py b/hooke/plugin/curve.py
index 9daab06c6a5faa48906522d3b33b90cfbd305399..158cb772a3e2c4ba31dcaf0aa4284c24e93c2f92 100644 (file)
--- a/hooke/plugin/curve.py
+++ b/hooke/plugin/curve.py
@@ -190,11 +190,11 @@ approaching curve and `1` selects the retracting curve.
                          help='Block B in A-B.'),
                 Argument(name='x column', type='int', default=0,
                          help="""
-Column of data block to differentiate with respect to.
+Column of data to return as x values.
 """.strip()),
-                Argument(name='f column', type='int', default=1,
+                Argument(name='y column', type='int', default=1,
                          help="""
-Column of data block to differentiate.
+Column of data block to difference.
 """.strip()),
                 ],
             help=self.__doc__, plugin=plugin)
@@ -205,7 +205,7 @@ Column of data block to differentiate.
         assert a[:,params['x column']] == b[:,params['x column']]
         out = Data((a.shape[0],2), dtype=a.dtype)
         out[:,0] = a[:,params['x column']]
-        out[:,1] = a[:,params['f column']] - b[:,params['f column']]
+        out[:,1] = a[:,params['y column']] - b[:,params['y column']]
         outqueue.put(out)
 
 class DerivativeCommand (Command):