diff --git a/README.md b/README.md
index 1cd3206..eede82e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # amscppperm1
 
-Numeric array template class library. A numeric array, in addition to the usual array operations, is expected to have numeric data that can be added, subtracted, multiplied, etc.
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+Numeric array template class library. A numeric array, in addition to the usual array operations, is expected to have numeric data that can be added, subtracted, multiplied, etc.
+
+This numeric array class implements random number generation, threaded vector operations, threaded math and statistics for fast operations on the arrays.
+
+The primary object is the template class narray<T>
+
+    ams::narray::narray<T>
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diff --git a/build_linux64/libamscppnarray.linux64.a b/build_linux64/libamscppnarray.linux64.a
index 9a39670..c3c1898 100644
Binary files a/build_linux64/libamscppnarray.linux64.a and b/build_linux64/libamscppnarray.linux64.a differ
diff --git a/build_linux64/objstore/amscppnarray_math.o b/build_linux64/objstore/amscppnarray_math.o
index 4a94787..e910f58 100644
Binary files a/build_linux64/objstore/amscppnarray_math.o and b/build_linux64/objstore/amscppnarray_math.o differ
diff --git a/build_linux64/tests b/build_linux64/tests
index f1d1844..c34c08d 100644
Binary files a/build_linux64/tests and b/build_linux64/tests differ
diff --git a/include/amscppnarray/amscppnarray.hpp b/include/amscppnarray/amscppnarray.hpp
index 735e378..fdf3911 100644
--- a/include/amscppnarray/amscppnarray.hpp
+++ b/include/amscppnarray/amscppnarray.hpp
@@ -53,6 +53,8 @@ template<typename T> class narray
     narray<T>& operator=(const std::initializer_list<T> initlist);
     ~narray();
 
+    template<typename T2> operator narray<T2>() const; //casting datatypes
+
     int resize(const narray_size_t newlength);
     const narray_size_t size() const;
 
diff --git a/include/amscppnarray/amscppnarray_impl.hpp b/include/amscppnarray/amscppnarray_impl.hpp
index 53c37e4..0e330ab 100644
--- a/include/amscppnarray/amscppnarray_impl.hpp
+++ b/include/amscppnarray/amscppnarray_impl.hpp
@@ -225,6 +225,28 @@ template<typename T> narray<T>& narray<T>::operator=(const std::initializer_list
     return *this;
 }
 
+template<class T> template<class T2> narray<T>::operator narray<T2>() const
+{
+    //casting datatypes
+    narray<T2> ret;
+    int res;
+
+    res = ret.resize(this->length);
+    if(res!=narray_success)
+    {
+        ret.resize(0);
+        return ret;
+    }
+    else
+    {
+        buffer_copycast<T2,T>(&(ret.data),data,length);
+    }
+
+    return ret;
+}
+
+
+
 template<typename T> narray<T>::~narray()
 {
     //printf("debug: destructor called for %p\n",this);
diff --git a/src/amscppnarray/amscppnarray_math.cpp b/src/amscppnarray/amscppnarray_math.cpp
index 5e28bf0..3115af7 100644
--- a/src/amscppnarray/amscppnarray_math.cpp
+++ b/src/amscppnarray/amscppnarray_math.cpp
@@ -63,7 +63,7 @@ namespace narray
         printf("rseed: %d\n",(int)rand::dpr32_rseed); //< -- this is different than the line above
 
         
-        narray<double> unif = ams::narray::rand::narray_rand(100);
+        narray<double> unif = ams::narray::rand::narray_rand(10000*10000);
         
 
         printf("rseed: %d\n",(int)rand::get_rseed());
diff --git a/src/main.cpp b/src/main.cpp
index b316a02..5d8bf2d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,7 +9,7 @@ int main(int argc, char* argv[])
     // ams::narray::test_narray3();
     // ams::narray::narray_testmath1();
     ams::narray::narray_testmath2();
-    ams::narray::narray_testmath3();
+    //ams::narray::narray_testmath3();
 
     return ret;
 }
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