diff --git a/ext/cvscalar.cpp b/ext/cvscalar.cpp
index 0b4923b..762e421 100644
--- a/ext/cvscalar.cpp
+++ b/ext/cvscalar.cpp
@@ -181,7 +181,7 @@ rb_to_s(VALUE self)
 {
   const int i = 6;
   VALUE str[i];
-  str[0] = rb_str_new2("<%s:%d,%d,%d,%d>");
+  str[0] = rb_str_new2("<%s:%g,%g,%g,%g>");
   str[1] = rb_str_new2(rb_class2name(CLASS_OF(self)));
   str[2] = rb_aref(self, INT2FIX(0));
   str[3] = rb_aref(self, INT2FIX(1));
diff --git a/test/test_cvmat.rb b/test/test_cvmat.rb
index 0d83b11..167c7a8 100755
--- a/test/test_cvmat.rb
+++ b/test/test_cvmat.rb
@@ -394,18 +394,22 @@ class TestCvMat < TestOpenCV
 
   def test_diag
     m = make_cvmat(5, 5)
+    # a = [1.1, 7.7, 14.3, 20.9, 27.5].map { |x| CvScalar.new(x, x, x, x) }
     a = [1, 7, 13, 19, 25].map { |x| CvScalar.new(x, x, x, x) }
     d = m.diag
+
     a.each_with_index { |s, i|
       assert(is_same_float_array(s.to_ary, d[i].to_ary))
     }
 
+    # a = [2.2, 8.8, 15.4, 22.0].map { |x| CvScalar.new(x, x, x, x) }
     a = [2, 8, 14, 20].map { |x| CvScalar.new(x, x, x, x) }
     d = m.diag(1)
     a.each_with_index { |s, i|
       assert(is_same_float_array(s.to_ary, d[i].to_ary))
     }
 
+    # a = [6.6, 13.2, 19.8, 26.4].map { |x| CvScalar.new(x, x, x, x) }
     a = [6, 12, 18, 24].map { |x| CvScalar.new(x, x, x, x) }
     d = m.diag(-1)
     a.each_with_index { |s, i|
@@ -413,6 +417,7 @@ class TestCvMat < TestOpenCV
     }
 
     # Alias
+    # a = [1.1, 7.7, 14.3, 20.9, 27.5].map { |x| CvScalar.new(x, x, x, x) }
     a = [1, 7, 13, 19, 25].map { |x| CvScalar.new(x, x, x, x) }
     d = m.diagonal
     a.each_with_index { |s, i|
diff --git a/test/test_cvscalar.rb b/test/test_cvscalar.rb
index cd8d38b..dc8ca2f 100755
--- a/test/test_cvscalar.rb
+++ b/test/test_cvscalar.rb
@@ -16,6 +16,11 @@ class TestCvScalar < TestOpenCV
     [10, 20, 30, 40].each_with_index { |x, i|
       assert_in_delta(x, s[i], 0.01)
     }
+
+    s = CvScalar.new(0.1, 0.2, 0.3, 0.4)
+    [0.1, 0.2, 0.3, 0.4].each_with_index { |x, i|
+      assert_in_delta(x, s[i], 0.01)
+    }
   end
 
   def test_aset
@@ -26,6 +31,14 @@ class TestCvScalar < TestOpenCV
     [10, 20, 30, 40].each_with_index { |x, i|
       assert_in_delta(x, s[i], 0.01)
     }
+
+    s = CvScalar.new
+    [0.1, 0.2, 0.3, 0.4].each_with_index { |x, i|
+      s[i] = x
+    }
+    [0.1, 0.2, 0.3, 0.4].each_with_index { |x, i|
+      assert_in_delta(x, s[i], 0.01)
+    }
   end
 
   def test_sub
@@ -37,20 +50,29 @@ class TestCvScalar < TestOpenCV
       assert_in_delta(24, s[2], 0.01)
       assert_in_delta(32, s[3], 0.01)
     }
+
+    s3 = CvScalar.new(0.2, 0.4, 0.6, 0.8)
+    [s2.sub(s3), s2 - s3].each { |s|
+      assert_in_delta(1.8, s[0], 0.01)
+      assert_in_delta(3.6, s[1], 0.01)
+      assert_in_delta(5.4, s[2], 0.01)
+      assert_in_delta(7.2, s[3], 0.01)
+    }
   end
 
   def test_to_s
     assert_equal("<OpenCV::CvScalar:10,20,30,40>", CvScalar.new(10, 20, 30, 40).to_s)
+    assert_equal("<OpenCV::CvScalar:0.1,0.2,0.3,0.4>", CvScalar.new(0.1, 0.2, 0.3, 0.4).to_s)
   end
 
   def test_to_ary
-    a = [10, 20, 30, 40]
-    s = CvScalar.new(*a)
-    
-    b = s.to_ary
-    assert_equal(Array, b.class)
-    a.each_with_index { |x, i|
-      assert_in_delta(x, b[i], 0.01)
+    [[10, 20, 30, 40], [0.1, 0.2, 0.3, 0.4]].each { |a|
+      s = CvScalar.new(*a)
+      b = s.to_ary
+      assert_equal(Array, b.class)
+      a.each_with_index { |x, i|
+        assert_in_delta(x, b[i], 0.01)
+      }
     }
   end