Fix many long to int implicit conversions

test/sparse.h

diff --git a/test/sparse.h b/test/sparse.h
index e19a763..81ab9e8 100644
--- a/test/sparse.h
+++ b/test/sparse.h
@@ -71,7 +71,7 @@
     //sparseMat.startVec(j);
     for(Index i=0; i<sparseMat.innerSize(); i++)
     {
-      int ai(i), aj(j);
+      Index ai(i), aj(j);
       if(IsRowMajor)
         std::swap(ai,aj);
       Scalar v = (internal::random<double>(0,1) < density) ? internal::random<Scalar>() : Scalar(0);
@@ -163,7 +163,7 @@
 {
   sparseVec.reserve(int(refVec.size()*density));
   sparseVec.setZero();
-  for(Index i=0; i<refVec.size(); i++)
+  for(int i=0; i<refVec.size(); i++)
   {
     Scalar v = (internal::random<double>(0,1) < density) ? internal::random<Scalar>() : Scalar(0);
     if (v!=Scalar(0))