Resolve "Check that element length is long relative to a time step"

Closes #349 (closed)

src/Algorithms/OrbitThreader.cpp

@@ -113,7 +113,7 @@ void OrbitThreader::checkElementLengths(const std::set<std::shared_ptr<Component
     if (stepSizes_m.reachedEnd()) {
         return;
     }
-    double driftLength = Physics::c * stepSizes_m.getdT() * p_m(2) / Util::getGamma(p_m);
+    double driftLength = Physics::c * stepSizes_m.getdT() * euclidean_norm(p_m) / Util::getGamma(p_m);
     for (const std::shared_ptr<Component> field : fields) {
         double length = field->getElementLength();
         int numSteps = field->getRequiredNumberOfTimeSteps();