--- trunk/src/perturbations/UniformField.cpp	2014/09/22 19:18:35	2020
+++ trunk/src/perturbations/UniformField.cpp	2014/10/22 12:23:59	2026
@@ -58,14 +58,28 @@ namespace OpenMD {
   }
   
   void UniformField::initialize() {
+
+    std::vector<RealType> ef;
+
     if (simParams->haveElectricField()) {
       doUniformField = true;
-      EF = simParams->getElectricField();
+      ef = simParams->getElectricField();            
     }   
     if (simParams->haveUniformField()) {
       doUniformField = true;
-      EF = simParams->getUniformField();
+      ef = simParams->getUniformField();
     }   
+    if (ef.size() != 3) {
+      sprintf(painCave.errMsg,
+              "UniformField: Incorrect number of parameters specified.\n"
+              "\tthere should be 3 parameters, but %lu were specified.\n", ef.size());
+      painCave.isFatal = 1;
+      simError();      
+    }
+    EF.x() = ef[0];
+    EF.y() = ef[1];
+    EF.z() = ef[2];
+
     int storageLayout_ = info_->getSnapshotManager()->getStorageLayout();
     if (storageLayout_ & DataStorage::dslParticlePot) doParticlePot = true;
     initialized = true;