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diff --git a/src/armadillo/include/armadillo_bits/fn_cumsum.hpp b/src/armadillo/include/armadillo_bits/fn_cumsum.hpp
new file mode 100644
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--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/fn_cumsum.hpp
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup fn_cumsum
+//! @{
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
+  const Op<T1, op_cumsum_vec>
+  >::result
+cumsum(const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_cumsum_vec>(X);
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value && resolves_to_vector<T1>::no,
+  const Op<T1, op_cumsum>
+  >::result
+cumsum(const T1& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_cumsum>(X, 0, 0);
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value,
+  const Op<T1, op_cumsum>
+  >::result
+cumsum(const T1& X, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_cumsum>(X, dim, 0);
+  }
+
+
+
+template<typename T>
+arma_warn_unused
+arma_inline
+typename arma_scalar_only<T>::result
+cumsum(const T& x)
+  {
+  return x;
+  }
+
+
+
+//! @}