Hello everyone. I'm trying to use the script to get the upperwall stress by time after a confiend shear, but I can just get the whole stress of the model by the script. how to modify the script to get the upperwall.

my \\\$numFrames = \\\$doc->Trajectory->NumFrames;
my \\\$symmetrysystem=  \\\$doc->SymmetrySystems;

for (my \\\$counter = 1; \\\$counter <= \\\$numFrames; ++\\\$counter) {
\\\$doc->Trajectory->CurrentFrame = \\\$counter;

my \\\$stressXX=0;
my \\\$stressYY=0;
my \\\$stressZZ=0;

foreach my \\\$symmetrysystem(@\\\$symmetrysystem)
{
my \\\$stress=\\\$symmetrysystem->Stress;

   \\\$stressXX=\\\$stressXX+\\\$stress->Eij(1,1);
   \\\$stressYY=\\\$stressYY+\\\$stress->Eij(2,2);
   \\\$stressZZ=\\\$stressZZ+\\\$stress->Eij(3,3);
}

Any help is appreciated!