2 files changed, 3 insertions, 3 deletions
diff --git a/src/body.cpp b/src/body.cpp
index a5c572a..83838a5 100644
--- a/src/body.cpp
+++ b/src/body.cpp
@@ -47,10 +47,10 @@ Body::vel ( const Matrix<double,3,1> &v )
  *--------------------------------------------------------------------------------------
  */
 Matrix<double,1,1>
-Body::S ( const Matrix<double,9,9> &P )
+Body::S ( const Matrix<double,9,9> &Pxx )
 {
     Matrix<double,1,1> S;
-    S << P(2,2);
+    S << Pxx(2,2);
     return S+R();
 }		/* -----  end of method Body::S  ----- */
 
diff --git a/src/body.h b/src/body.h
index 6c1268e..38497e6 100644
--- a/src/body.h
+++ b/src/body.h
@@ -38,7 +38,7 @@ class Body
                 const Quaterniond &q, const double dt);
         Matrix<double,9,9> Q(double dt);
         Matrix<double,1,1> R();
-        Matrix<double,1,1> S(const Matrix<double,9,9> &P);
+        Matrix<double,1,1> S(const Matrix<double,9,9> &Pxx);
         Matrix<double,3,3> skewSymmetric(const Vector3d &x);
         void unicsv();