Hello,

Consider we have a finite element model with two elements and each element has a line with slope. consider again we run that finite element with two different theories. Therefore, for each element we have a line with slope for each theories. It means that we have two lines in first theory and two lines in the second one. We want to compare those and find the normalized differences. I want to use this formula:

sqrt(([Sigma(x1-x2)^2/(x1^2)]/n-1))*100% with x1 is angle for the first model and x2 is angle for the final model and sigma is sum.  

However, if one of the angles is zero what should I do?