Changeset 10078 for trunk/psModules/src/objects/models/pmModel_QGAUSS.c

Timestamp:

Nov 17, 2006, 11:53:01 PM (19 years ago)

Author:

magnier

Message:

replaced factor of 2 in SXX, SYY derivative to slow swings

File:

• trunk/psModules/src/objects/models/pmModel_QGAUSS.c (modified) (1 diff)

trunk/psModules/src/objects/models/pmModel_QGAUSS.c

@@ -63 +63 @@
         dPAR[PM_PAR_XPOS] = q*(2.0*px/PAR[PM_PAR_SXX] + Y*PAR[PM_PAR_SXY]);
         dPAR[PM_PAR_YPOS] = q*(2.0*py/PAR[PM_PAR_SYY] + X*PAR[PM_PAR_SXY]);
-        dPAR[PM_PAR_SXX]  = +2.0*q*px*px/PAR[PM_PAR_SXX];
-        dPAR[PM_PAR_SYY]  = +2.0*q*py*py/PAR[PM_PAR_SYY];
+        // the extra factor of 2 below is needed to avoid excessive swings
+        dPAR[PM_PAR_SXX]  = +4.0*q*px*px/PAR[PM_PAR_SXX];
+        dPAR[PM_PAR_SYY]  = +4.0*q*py*py/PAR[PM_PAR_SYY];
         dPAR[PM_PAR_SXY]  = -q*X*Y;
         dPAR[PM_PAR_7]    = -t*z;