diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -7,3 +7,7 @@
 ## 0.1.1.0 -- 2020-09-17
 
 * First version revised A. Defined intervalNRealFrac for the equal two first arguments (though this can be rarely useful). 
+
+## 0.2.0.0 -- 2020-09-19
+
+* Second version. Some code re-defining for special cases. 
diff --git a/Languages/UniquenessPeriods/Vector/Filters.hs b/Languages/UniquenessPeriods/Vector/Filters.hs
--- a/Languages/UniquenessPeriods/Vector/Filters.hs
+++ b/Languages/UniquenessPeriods/Vector/Filters.hs
@@ -30,7 +30,7 @@
   -> b 
   -> Int
 intervalNRealFrac minE maxE n x 
- | maxE == minE = round (0.5 * fromIntegral n)
+ | maxE == minE = ceiling (0.5 * fromIntegral n)
  | otherwise = zero2One . ceiling $ fromIntegral n * (x - minE) / (maxE - minE)
 {-# INLINE intervalNRealFrac #-} 
 
@@ -49,7 +49,9 @@
   -> b
   -> b
   -> b
-unsafeTransfer1I5 minE0 maxE0 minE1 maxE1 x = minE1 + (x - minE0) * (maxE1 - minE1) / (maxE0 - minE0) 
+unsafeTransfer1I5 minE0 maxE0 minE1 maxE1 x 
+ | minE0 == maxE0 = x
+ | otherwise = minE1 + (x - minE0) * (maxE1 - minE1) / (maxE0 - minE0) 
 {-# INLINE unsafeTransfer1I5 #-} 
 
 -- | A variant of the 'unsafeTransfer1I5' where the lengths of the both intervals (the old and the new ones) are equal.
@@ -74,8 +76,10 @@
   -> V.Vector (Int,Int)
   -> b
   -> b
-unsafeRearrangeIG minE maxE n v x = x + fromIntegral (getBFst' (n0, v) n0 - n0) * (maxE - minE) / fromIntegral n
-   where n0 = intervalNRealFrac minE maxE n x
+unsafeRearrangeIG minE maxE n v x 
+ | minE == maxE = x
+ | otherwise = x + fromIntegral (getBFst' (n0, v) n0 - n0) * (maxE - minE) / fromIntegral n
+      where n0 = intervalNRealFrac minE maxE n x
 
 -- | An unzipped variant of the 'unsafeRearrangeIG' function where the 'V.Vector' argument is internally 'V.zip'ped as the second argument with the 'V.Vector' @[1..n]@. 
 -- This allows to shorten the time of the arguments writing given only the resulting backpermutted indexes in the 'V.Vector'.
diff --git a/uniqueness-periods-vector-filters.cabal b/uniqueness-periods-vector-filters.cabal
--- a/uniqueness-periods-vector-filters.cabal
+++ b/uniqueness-periods-vector-filters.cabal
@@ -2,7 +2,7 @@
 --   For further documentation, see http://haskell.org/cabal/users-guide/
 
 name:                uniqueness-periods-vector-filters
-version:             0.1.1.0
+version:             0.2.0.0
 synopsis:            A library allows to change the structure of the 'RealFrac' function output.
 description:         A library allows to change the structure of the 'RealFrac' function output. At the moment only the equal intervals are supported.