diff --git a/src/ExtendableSparse.jl b/src/ExtendableSparse.jl
index a1fd4e9..0dd8536 100644
--- a/src/ExtendableSparse.jl
+++ b/src/ExtendableSparse.jl
@@ -39,7 +39,7 @@ STExtendableSparseMatrixCSC(m,n,args...)=STExtendableSparseMatrixCSC{Float64,Int
 
 
 export ExtendableSparseMatrixCSC, MTExtendableSparseMatrixCSC, STExtendableSparseMatrixCSC, GenericMTExtendableSparseMatrixCSC
-export SparseMatrixLNK, ExtendableSparseMatrix,flush!, nnz, updateindex!, rawupdateindex!, colptrs, sparse, reset!
+export SparseMatrixLNK, ExtendableSparseMatrix,flush!, nnz, updateindex!, rawupdateindex!, colptrs, sparse, reset!, nnznew
 export partitioning!
 
 export eliminate_dirichlet, eliminate_dirichlet!, mark_dirichlet
diff --git a/src/matrix/extendable.jl b/src/matrix/extendable.jl
index a9debf7..d4c35b5 100644
--- a/src/matrix/extendable.jl
+++ b/src/matrix/extendable.jl
@@ -182,7 +182,8 @@ function rawupdateindex!(ext::ExtendableSparseMatrixCSC{Tv, Ti},
                          op,
                          v,
                          i,
-                         j) where {Tv, Ti <: Integer}
+                         j,
+                         part=1) where {Tv, Ti <: Integer}
     k = findindex(ext.cscmatrix, i, j)
     if k > 0
         ext.cscmatrix.nzval[k] = op(ext.cscmatrix.nzval[k], v)
diff --git a/src/matrix/genericextendablesparsematrixcsc.jl b/src/matrix/genericextendablesparsematrixcsc.jl
index c741283..457413e 100644
--- a/src/matrix/genericextendablesparsematrixcsc.jl
+++ b/src/matrix/genericextendablesparsematrixcsc.jl
@@ -18,6 +18,8 @@ function GenericExtendableSparseMatrixCSC{Tm, Tv, Ti}(m::Integer,n::Integer) whe
 end
 
 
+nnznew(ext::GenericExtendableSparseMatrixCSC)=nnz(ext.xmatrix)
+
 function reset!(ext::GenericExtendableSparseMatrixCSC{Tm,Tv,Ti}) where {Tm,Tv,Ti}
     m,n=size(ext.cscmatrix)
     ext.cscmatrix=spzeros(Tv, Ti, m, n)
diff --git a/src/matrix/genericmtextendablesparsematrixcsc.jl b/src/matrix/genericmtextendablesparsematrixcsc.jl
index 91c805d..88a4d68 100644
--- a/src/matrix/genericmtextendablesparsematrixcsc.jl
+++ b/src/matrix/genericmtextendablesparsematrixcsc.jl
@@ -81,6 +81,9 @@ function Base.getindex(ext::GenericMTExtendableSparseMatrixCSC,
     end
 end
 
+nnznew(ext::GenericMTExtendableSparseMatrixCSC)=sum(nnz,ext.xmatrices)
+
+
 function rawupdateindex!(ext::GenericMTExtendableSparseMatrixCSC,
                          op,
                          v,