diff --git a/Makefile.am b/Makefile.am
index 8755b2d..88dedfc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 lib_LTLIBRARIES = libla.la
-include_HEADERS = simple.h vecmat3.h quaternion.h fortran.h cuda_la.h auxstorage.h  davidson.h   laerror.h    mat.h          qsort.h             vec.h bisection.h   diis.h       la.h         noncblas.h     smat.h bitvector.h   fourindex.h  la_traits.h  nonclass.h     sparsemat.h sparsesmat.h csrmat.h conjgrad.h    gmres.h      matexp.h     permutation.h   polynomial.h
-libla_la_SOURCES = simple.cc quaternion.cc vecmat3.cc vec.cc mat.cc smat.cc sparsemat.cc sparsesmat.cc csrmat.cc laerror.cc noncblas.cc  bitvector.cc strassen.cc nonclass.cc cuda_la.cc fourindex.cc permutation.cc polynomial.cc
+include_HEADERS = simple.h vecmat3.h quaternion.h fortran.h cuda_la.h auxstorage.h  davidson.h   laerror.h    mat.h          qsort.h             vec.h bisection.h   diis.h       la.h         noncblas.h     smat.h bitvector.h   fourindex.h  la_traits.h  nonclass.h     sparsemat.h sparsesmat.h csrmat.h conjgrad.h    gmres.h      matexp.h     permutation.h   polynomial.h contfrac.h
+libla_la_SOURCES = simple.cc quaternion.cc vecmat3.cc vec.cc mat.cc smat.cc sparsemat.cc sparsesmat.cc csrmat.cc laerror.cc noncblas.cc  bitvector.cc strassen.cc nonclass.cc cuda_la.cc fourindex.cc permutation.cc polynomial.cc contfrac.cc
 check_PROGRAMS = t test
 t_SOURCES = t.cc t2.cc 
 test_SOURCES = test.cc
diff --git a/contfrac.cc b/contfrac.cc
new file mode 100644
index 0000000..70aaf27
--- /dev/null
+++ b/contfrac.cc
@@ -0,0 +1,43 @@
+/*
+    LA: linear algebra C++ interface library
+    Copyright (C) 2022 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "contfrac.h"
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+
+namespace LA {
+
+
+/***************************************************************************//**
+ * forced instantization in the corresponding object file
+ ******************************************************************************/
+template class ContFrac<int>;
+template class ContFrac<unsigned int>;
+
+#define INSTANTIZE(T) \
+
+
+
+INSTANTIZE(int)
+INSTANTIZE(unsigned int)
+
+
+
+}//namespace
diff --git a/contfrac.h b/contfrac.h
new file mode 100644
index 0000000..8e5731c
--- /dev/null
+++ b/contfrac.h
@@ -0,0 +1,45 @@
+/*
+    LA: linear algebra C++ interface library
+    Copyright (C) 2022 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef _CONTFRAC_H
+#define _CONTFRAC_H
+
+#include "la_traits.h"
+#include "vec.h"
+
+namespace LA {
+
+
+template <typename T>
+class ContFrac : public NRVec<T> {
+public:
+	ContFrac():  NRVec<T>() {};
+	template<int SIZE>  ContFrac(const T (&a)[SIZE]) : NRVec<T>(a) {};
+	ContFrac(const NRVec<T> &v) : NRVec<T>(v) {}; //allow implicit conversion from NRVec
+	ContFrac(const int n) : NRVec<T>(n+1) {};
+
+	int length() const {return NRVec<T>::size()-1;};
+	void resize(const int n, const bool preserve=true) {NRVec<T>::resize(n+1,preserve);}
+	
+};
+
+
+
+}//namespace
+#endif
diff --git a/la.h b/la.h
index 0201ed4..1a41bbb 100644
--- a/la.h
+++ b/la.h
@@ -42,6 +42,7 @@
 #include "csrmat.h"
 #include "vec.h"
 #include "polynomial.h"
+#include "contfrac.h"
 
 using namespace LA;
 typedef NRMat<int> NRIMat;
diff --git a/t.cc b/t.cc
index e83d40d..da887d2 100644
--- a/t.cc
+++ b/t.cc
@@ -24,6 +24,7 @@
 #include "quaternion.h"
 #include "permutation.h"
 #include "polynomial.h"
+#include "contfrac.h"
 #include "simple.h"
 
 using namespace std;