--- trunk/src/perturbations/UniformField.cpp	2014/09/22 19:18:35	2020
+++ trunk/src/perturbations/UniformField.cpp	2015/03/07 21:41:51	2071
@@ -50,22 +50,36 @@ namespace OpenMD {
 
 namespace OpenMD {
   
-  UniformField::UniformField(SimInfo* info) : info_(info), 
-                                            doUniformField(false), 
-                                            doParticlePot(false),
-                                            initialized(false) {
+  UniformField::UniformField(SimInfo* info) : initialized(false), 
+					      doUniformField(false), 
+					      doParticlePot(false),
+					      info_(info) {
     simParams = info_->getSimParams();
   }
   
   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;