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diff --git a/README.md b/README.md
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+# Matrix
+
+An unfinished matrix calculator written in Haskell.
diff --git a/main.hs b/main.hs
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+--innerProduct :: [Int] -> [Int] -> Int
+dotProduct [] [] = 0
+dotProduct (x:xs) (y:ys) = x * y + dotProduct xs ys
+
+--oneRow row [[], []] = []
+oneRow row mat@(x:xs) = if null x
+                  then []
+                  else dotProduct row (map head mat) : oneRow row (map tail mat)
+
+almostMatrixMult mat1 mat2 = if null mat1
+                        then [[]]
+                        else oneRow (head mat1) mat2 : almostMatrixMult (tail mat1) mat2
+
+matrixMult mat1 mat2 = [a | a <- almostMatrixMult mat1 mat2, not $ null a]
+
+
+dropNth xs n = map fst $ filter ((n/=) . snd) $ zip xs [1..]
+
+minor mat i = dropNth (map tail mat) i
+
+cofac mat i = ((-1) ^ (i+1)) * det (minor mat i)
+
+expFac mat i = head (mat!!(i-1)) * cofac mat i
+
+det [[a, b], [c, d]] = a * d - b * c
+det mat = helper mat 1 where
+            helper mat i = if i >= length mat
+                                    then expFac mat i
+                                    else expFac mat i + helper mat (i+1)