diff --git a/Diagrams/TwoD/ProbabilityGrid.hs b/Diagrams/TwoD/ProbabilityGrid.hs
new file mode 100644
--- /dev/null
+++ b/Diagrams/TwoD/ProbabilityGrid.hs
@@ -0,0 +1,67 @@
+
+-- | Probability grid square drawing routines.
+
+module Diagrams.TwoD.ProbabilityGrid where
+
+import Data.List (genericLength)
+import Data.List.Split (chunksOf)
+import Diagrams.Backend.Postscript
+import Diagrams.Backend.SVG
+import Diagrams.Prelude
+import Diagrams.TwoD
+import Diagrams.TwoD.Text
+import Numeric.Log
+
+
+
+-- | Fill weight for our grid. If the fill weight is @logarithmic@, then
+-- the line length is @1 / (1 + log value)@ otherwise it is @value@.
+
+data FillWeight = FWlog | FWlinear
+
+-- | A single square in our grid.
+
+-- gridSquare :: FillWeight -> Log Double
+gridSquare
+  :: (Monoid m, Semigroup m, TrailLike (QDiagram b V2 Double m))
+  => FillWeight -> Log Double -> QDiagram b V2 Double m
+gridSquare (fw :: FillWeight) (v :: Log Double) = g `beneath` (z # scale s)
+  where s = case fw of
+              FWlog     -> 1 / (1 - ln v)
+              FWlinear  -> exp $ ln v
+        z = square 1 # lw 0 # fc blue # centerXY
+        g = square 1 # lc black
+
+-- | Draw the actual grid.
+
+grid
+  :: ( Renderable (Diagrams.TwoD.Text.Text Double) b
+     , Renderable (Path V2 Double) b)
+  => FillWeight
+  -> t
+  -> Int
+  -> [String]
+  -> [String]
+  -> [Log Double]
+  -> QDiagram b V2 Double Any
+grid (fw :: FillWeight) n m (ns :: [String]) (ms :: [String]) (vs :: [Log Double])
+  | null ns && null ms = grd
+  | otherwise =  (grd ||| ns') === ms'
+  where ns' = if null ns then mempty else vcat $ map (\t -> (square 1) `beneath` (text t # scale (0.9 / genericLength t))) ns
+        ms' = if null ms then mempty else hcat $ map (\t -> (square 1) `beneath` (text t # scale (0.9 / genericLength t))) ms
+        grd = vcat $ map hcat $ map (map (gridSquare fw)) $ chunksOf m $ vs
+
+-- | Render as @svg@.
+
+svgGridFile :: FilePath -> FillWeight -> Int -> Int -> [String] -> [String] -> [Log Double] -> IO ()
+svgGridFile fname fw n m ns ms vs = renderPretty fname size $ g
+  where size = ((*100) . fromIntegral) <$> mkSizeSpec2D (Just m) (Just n) -- Nothing Nothing -- n n
+        g = grid fw n m ns ms vs
+
+-- | Render as @eps@.
+
+epsGridFile :: String -> FillWeight -> Int -> Int -> [String] -> [String] -> [Log Double] -> IO ()
+epsGridFile fname fw n m ns ms vs = renderDia Postscript (PostscriptOptions fname size EPS) g
+  where size = ((*100) . fromIntegral) <$> mkSizeSpec2D (Just m) (Just n)
+        g = grid fw n m ns ms vs
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Christian Hoener zu Siederdissen 2016
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Christian Hoener zu Siederdissen nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/PrimitiveArray-Pretty.cabal b/PrimitiveArray-Pretty.cabal
new file mode 100644
--- /dev/null
+++ b/PrimitiveArray-Pretty.cabal
@@ -0,0 +1,81 @@
+Name:           PrimitiveArray-Pretty
+Version:        0.0.0.1
+License:        BSD3
+License-file:   LICENSE
+Maintainer:     choener@bioinf.uni-leipzig.de
+author:         Christian Hoener zu Siederdissen, 2016
+copyright:      Christian Hoener zu Siederdissen, 2016
+homepage:       https://github.com/choener/PrimitiveArray-Pretty
+bug-reports:    https://github.com/choener/PrimitiveArray-Pretty/issues
+Stability:      Experimental
+Category:       Data
+Build-type:     Simple
+Cabal-version:  >=1.10.0
+tested-with:    GHC == 7.8.4, GHC == 7.10.3
+Synopsis:       Pretty-printing for primitive arrays
+Description:
+                <http://www.bioinf.uni-leipzig.de/Software/gADP/ generalized Algebraic Dynamic Programming>
+                .
+                A Pretty-printer for Primitive Arrays.
+                .
+                The idea is not so much to provide pretty-printing for single
+                arrays, but rather to allow for simple prettyfication of
+                typical array data. In particular we want to have simplified
+                pretty-printing of Inside/Outside combinations of arrays.
+
+
+
+extra-source-files:
+  README.md
+  changelog.md
+
+
+
+Library
+  Exposed-modules:
+    Diagrams.TwoD.ProbabilityGrid
+  build-depends: base                     >= 4.7    &&  < 4.9
+               , diagrams                 >= 1.3    &&  < 1.4
+               , diagrams-lib             >= 1.3    &&  < 1.4
+               , diagrams-svg             >= 1.3    &&  < 1.4
+               , diagrams-postscript      >= 1.3    &&  < 1.4
+               , log-domain               >= 0.10   &&  < 0.11
+               , split                    >= 0.2    &&  < 0.3
+  default-extensions: BangPatterns
+                    , TypeFamilies
+                    , FlexibleContexts
+                    , ScopedTypeVariables
+  default-language:
+    Haskell2010
+  ghc-options:
+    -O2
+    -funbox-strict-fields
+
+
+
+test-suite properties
+  type:
+    exitcode-stdio-1.0
+  main-is:
+    properties.hs
+  ghc-options:
+    -threaded -rtsopts -with-rtsopts=-N
+  hs-source-dirs:
+    tests
+  default-language:
+    Haskell2010
+  default-extensions: CPP
+                    , TemplateHaskell
+  build-depends: base
+               , PrimitiveArray-Pretty
+               , QuickCheck
+               , test-framework               >= 0.8  && < 0.9
+               , test-framework-quickcheck2   >= 0.3  && < 0.4
+               , test-framework-th            >= 0.2  && < 0.3
+
+
+
+source-repository head
+  type: git
+  location: git://github.com/choener/PrimitiveArray-Pretty
+
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+[![Build Status](https://travis-ci.org/choener/PrimitiveArray-Pretty.svg?branch=master)](https://travis-ci.org/choener/PrimitiveArray-Pretty)
+
+# PrimitiveArray-Pretty
+
+[*generalized Algebraic Dynamic Programming Homepage*](http://www.bioinf.uni-leipzig.de/Software/gADP/)
+
+Prettyprinting for tables that holds probability information. Currently mostly
+useful for pretty-printing the result of Inside-Outside calculations.
+
+
+
+#### Contact
+
+Christian Hoener zu Siederdissen  
+Leipzig University, Leipzig, Germany  
+choener@bioinf.uni-leipzig.de  
+http://www.bioinf.uni-leipzig.de/~choener/  
+
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/changelog.md b/changelog.md
new file mode 100644
--- /dev/null
+++ b/changelog.md
@@ -0,0 +1,4 @@
+0.0.0.1
+-------
+
+- initial checkin
diff --git a/tests/properties.hs b/tests/properties.hs
new file mode 100644
--- /dev/null
+++ b/tests/properties.hs
@@ -0,0 +1,8 @@
+
+module Main where
+
+
+
+main :: IO ()
+main = return ()
+
