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diff --git a/src/armadillo/include/armadillo_bits/fn_trimat_ind.hpp b/src/armadillo/include/armadillo_bits/fn_trimat_ind.hpp
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+++ b/src/armadillo/include/armadillo_bits/fn_trimat_ind.hpp
@@ -0,0 +1,139 @@
+// 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_trimat_ind
+//! @{
+
+
+arma_warn_unused
+inline
+uvec
+trimatu_ind(const SizeMat& s, const sword k = 0)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword n_rows = s.n_rows;
+  const uword n_cols = s.n_cols;
+  
+  const uword row_offset = (k < 0) ? uword(-k) : uword(0);
+  const uword col_offset = (k > 0) ? uword( k) : uword(0);
+  
+  arma_debug_check_bounds( ((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)), "trimatu_ind(): requested diagonal is out of bounds" );
+  
+  const uword N = (std::min)(n_rows - row_offset, n_cols - col_offset);
+  
+  uvec   tmp(n_rows * n_cols, arma_nozeros_indicator());  // worst case scenario
+  uword* tmp_mem = tmp.memptr();
+  uword  count   = 0;
+  
+  for(uword i=0; i < n_cols; ++i)
+    {
+    const uword col = i + col_offset;
+    
+    if(i < N)
+      {
+      const uword end_row = i + row_offset;
+      
+      const uword index_offset = (n_rows * col);
+      
+      for(uword row=0; row <= end_row; ++row)
+        {
+        tmp_mem[count] = index_offset + row;
+        ++count;
+        }
+      }
+    else
+      {
+      if(col < n_cols)
+        {
+        const uword index_offset = (n_rows * col);
+        
+        for(uword row=0; row < n_rows; ++row)
+          {
+          tmp_mem[count] = index_offset + row;
+          ++count;
+          }
+        }
+      }
+    }
+  
+  uvec out;
+  
+  out.steal_mem_col(tmp, count);
+  
+  return out;
+  }
+
+
+
+arma_warn_unused
+inline
+uvec
+trimatl_ind(const SizeMat& s, const sword k = 0)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword n_rows = s.n_rows;
+  const uword n_cols = s.n_cols;
+  
+  const uword row_offset = (k < 0) ? uword(-k) : uword(0);
+  const uword col_offset = (k > 0) ? uword( k) : uword(0);
+  
+  arma_debug_check_bounds( ((row_offset > 0) && (row_offset >= n_rows)) || ((col_offset > 0) && (col_offset >= n_cols)), "trimatl_ind(): requested diagonal is out of bounds" );
+  
+  const uword N = (std::min)(n_rows - row_offset, n_cols - col_offset);
+  
+  uvec   tmp(n_rows * n_cols, arma_nozeros_indicator());  // worst case scenario
+  uword* tmp_mem = tmp.memptr();
+  uword  count   = 0;
+  
+  for(uword col=0; col < col_offset; ++col)
+    {
+    const uword index_offset = (n_rows * col);
+    
+    for(uword row=0; row < n_rows; ++row)
+      {
+      tmp_mem[count] = index_offset + row;
+      ++count;
+      }
+    }
+  
+  for(uword i=0; i<N; ++i)
+    {
+    const uword start_row = i + row_offset;
+    const uword       col = i + col_offset;
+    
+    const uword index_offset = (n_rows * col);
+    
+    for(uword row=start_row; row < n_rows; ++row)
+      {
+      tmp_mem[count] = index_offset + row;
+      ++count;
+      }
+    }
+  
+  uvec out;
+  
+  out.steal_mem_col(tmp, count);
+  
+  return out;
+  }
+
+
+
+//! @}