1 files changed, 4 insertions, 0 deletions

diff --git a/packages/sundials/src/Numeric/Sundials/ODEOpts.hs b/packages/sundials/src/Numeric/Sundials/ODEOpts.hs
index e924292..538b474 100644
--- a/packages/sundials/src/Numeric/Sundials/ODEOpts.hs
+++ b/packages/sundials/src/Numeric/Sundials/ODEOpts.hs
@@ -8,9 +8,13 @@ import           Foreign.C.Types
 import qualified Data.Vector.Storable as VS
 import qualified Data.Vector.Storable.Mutable as VM
 
+import           Numeric.LinearAlgebra.HMatrix (Vector, Matrix)
+
 import qualified Types as T
 import qualified Arkode as B
 
+type Jacobian = Double -> Vector Double -> Matrix Double
+
 data ODEOpts = ODEOpts {
     maxNumSteps :: Int32
   , minStep     :: Double