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diff --git a/src/armadillo/include/armadillo_bits/op_chi2rnd_meat.hpp b/src/armadillo/include/armadillo_bits/op_chi2rnd_meat.hpp
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@@ -0,0 +1,176 @@
+// 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 op_chi2rnd
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+op_chi2rnd::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_chi2rnd>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const Proxy<T1> P(in.m);
+  
+  if(P.is_alias(out) == false)
+    {
+    op_chi2rnd::apply_noalias(out, P);
+    }
+  else
+    {
+    Mat<eT> tmp;
+    
+    op_chi2rnd::apply_noalias(tmp, P);
+    
+    out.steal_mem(tmp);
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_chi2rnd::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  op_chi2rnd_varying_df<eT> generator;
+  
+  const uword n_rows = P.get_n_rows();
+  const uword n_cols = P.get_n_cols();
+  
+  out.set_size(n_rows, n_cols);
+  
+  eT* out_mem = out.memptr();
+  
+  if(Proxy<T1>::use_at == false)
+    {
+    const uword N = P.get_n_elem();
+    
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+    
+    for(uword i=0; i<N; ++i)
+      {
+      out_mem[i] = generator( Pea[i] );
+      }
+    }
+  else
+    {
+    for(uword col=0; col < n_cols; ++col)
+    for(uword row=0; row < n_rows; ++row)
+      {
+      (*out_mem) = generator( P.at(row,col) );  ++out_mem;
+      }
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+op_chi2rnd::fill_constant_df(Mat<eT>& out, const eT df)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(df > eT(0))
+    {
+    typedef std::mt19937_64                   motor_type;
+    typedef std::mt19937_64::result_type      seed_type;
+    typedef std::chi_squared_distribution<eT> distr_type;
+    
+    motor_type motor;  motor.seed( seed_type(arma_rng::randi<int>()) );
+    distr_type distr(df);
+    
+    const uword N = out.n_elem;
+    
+    eT* out_mem = out.memptr();
+    
+    for(uword i=0; i<N; ++i)
+      {
+      out_mem[i] = eT( distr(motor) );
+      }
+    }
+  else
+    {
+    out.fill( Datum<eT>::nan );
+    }
+  }
+
+
+
+//
+
+
+
+template<typename eT>
+inline
+op_chi2rnd_varying_df<eT>::~op_chi2rnd_varying_df()
+  {
+  arma_extra_debug_sigprint();
+  }
+
+
+
+template<typename eT>
+inline
+op_chi2rnd_varying_df<eT>::op_chi2rnd_varying_df()
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef std::mt19937_64::result_type seed_type;
+  
+  motor.seed( seed_type(arma_rng::randi<int>()) );
+  }
+
+
+
+template<typename eT>
+inline
+eT
+op_chi2rnd_varying_df<eT>::operator()(const eT df)
+  {
+  arma_extra_debug_sigprint();
+  
+  // as C++11 doesn't seem to provide a way to explicitly set the parameter
+  // of an existing chi_squared_distribution object,
+  // we need to create a new object each time
+  
+  if(df > eT(0))
+    {
+    std::chi_squared_distribution<eT> distr(df);
+    
+    return eT( distr(motor) );
+    }
+  else
+    {
+    return Datum<eT>::nan;
+    }
+  }
+
+
+
+//! @}