Index: /issm/trunk-jpl/src/m/mech/drivingstress.m
===================================================================
--- /issm/trunk-jpl/src/m/mech/drivingstress.m	(revision 21697)
+++ /issm/trunk-jpl/src/m/mech/drivingstress.m	(revision 21698)
@@ -14,5 +14,5 @@
 thickness_bar=(md.geometry.thickness(md.mesh.elements(:,1))+md.geometry.thickness(md.mesh.elements(:,2))+md.geometry.thickness(md.mesh.elements(:,3)))/3;
 
-px=md.materials.rho_ice*md.constants.g*thickness_bar.*sx;
-py=md.materials.rho_ice*md.constants.g*thickness_bar.*sy;
+px=-md.materials.rho_ice*md.constants.g*thickness_bar.*sx;
+py=-md.materials.rho_ice*md.constants.g*thickness_bar.*sy;
 pmag=sqrt(px.^2+py.^2);