diff --git a/gtsam.h b/gtsam.h
index 3222cd2d1..9d7d7a7a6 100644
--- a/gtsam.h
+++ b/gtsam.h
@@ -1090,13 +1090,13 @@ class LevenbergMarquardtParams {
   LevenbergMarquardtParams();
   void print(string s) const;
 
-  double getMaxIterations() const;
+  size_t getMaxIterations() const;
   double getRelativeErrorTol() const;
   double getAbsoluteErrorTol() const;
   double getErrorTol() const;
   string getVerbosity() const;
 
-  void setMaxIterations(double value);
+  void setMaxIterations(size_t value);
   void setRelativeErrorTol(double value);
   void setAbsoluteErrorTol(double value);
   void setErrorTol(double value);
diff --git a/gtsam/linear/VectorValues.h b/gtsam/linear/VectorValues.h
index aa9c1aa6d..9fad99223 100644
--- a/gtsam/linear/VectorValues.h
+++ b/gtsam/linear/VectorValues.h
@@ -419,7 +419,7 @@ namespace gtsam {
     maps_.reserve(maps_.size() + dimensions.size());
     BOOST_FOREACH(size_t dim, dimensions) {
       maps_.push_back(values_.segment(varStart, dim));
-      varStart += dim; // varStart is continued from first for loop
+      varStart += (int)dim; // varStart is continued from first for loop
     }
   }
 
diff --git a/gtsam/nonlinear/NonlinearOptimizer.h b/gtsam/nonlinear/NonlinearOptimizer.h
index 44b352938..1c071faef 100644
--- a/gtsam/nonlinear/NonlinearOptimizer.h
+++ b/gtsam/nonlinear/NonlinearOptimizer.h
@@ -45,23 +45,23 @@ public:
   Verbosity verbosity; ///< The printing verbosity during optimization (default SILENT)
 
   NonlinearOptimizerParams() :
-    maxIterations(100.0), relativeErrorTol(1e-5), absoluteErrorTol(1e-5),
+    maxIterations(100), relativeErrorTol(1e-5), absoluteErrorTol(1e-5),
     errorTol(0.0), verbosity(SILENT) {}
 
   virtual ~NonlinearOptimizerParams() {}
   virtual void print(const std::string& str = "") const ;
 
-  inline double getMaxIterations() const { return maxIterations; }
-  inline double getRelativeErrorTol() const { return relativeErrorTol; }
-  inline double getAbsoluteErrorTol() const { return absoluteErrorTol; }
-  inline double getErrorTol() const { return errorTol; }
-  inline std::string getVerbosity() const { return verbosityTranslator(verbosity); }
+  size_t getMaxIterations() const { return maxIterations; }
+  double getRelativeErrorTol() const { return relativeErrorTol; }
+  double getAbsoluteErrorTol() const { return absoluteErrorTol; }
+  double getErrorTol() const { return errorTol; }
+  std::string getVerbosity() const { return verbosityTranslator(verbosity); }
 
-  inline void setMaxIterations(double value) { maxIterations = value; }
-  inline void setRelativeErrorTol(double value) { relativeErrorTol = value; }
-  inline void setAbsoluteErrorTol(double value) { absoluteErrorTol = value; }
-  inline void setErrorTol(double value) { errorTol  = value ; }
-  inline void setVerbosity(const std::string &src) { verbosity = verbosityTranslator(src); }
+  void setMaxIterations(size_t value) { maxIterations = value; }
+  void setRelativeErrorTol(double value) { relativeErrorTol = value; }
+  void setAbsoluteErrorTol(double value) { absoluteErrorTol = value; }
+  void setErrorTol(double value) { errorTol  = value ; }
+  void setVerbosity(const std::string &src) { verbosity = verbosityTranslator(src); }
 
   Verbosity verbosityTranslator(const std::string &s) const;
   std::string verbosityTranslator(Verbosity value) const;
diff --git a/gtsam/nonlinear/Ordering.h b/gtsam/nonlinear/Ordering.h
index c2bac18f8..c6881fbde 100644
--- a/gtsam/nonlinear/Ordering.h
+++ b/gtsam/nonlinear/Ordering.h
@@ -155,7 +155,7 @@ public:
   iterator end() { return order_.end(); }
 
   /// Test if the key exists in the ordering.
-  bool exists(Key key) const { return order_.count(key); }
+  bool exists(Key key) const { return order_.count(key) > 0; }
 
   ///TODO: comment
   std::pair<iterator,bool> tryInsert(Key key, Index order) { return tryInsert(std::make_pair(key,order)); }