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diff --git a/src/armadillo/include/armadillo_bits/fn_princomp.hpp b/src/armadillo/include/armadillo_bits/fn_princomp.hpp
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+// 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_princomp
+//! @{
+
+
+
+//! \brief
+//! principal component analysis -- 4 arguments version
+//! coeff_out    -> principal component coefficients
+//! score_out    -> projected samples
+//! latent_out   -> eigenvalues of principal vectors
+//! tsquared_out -> Hotelling's T^2 statistic
+template<typename T1>
+inline
+bool
+princomp
+  (
+         Mat<typename T1::elem_type>&    coeff_out,
+         Mat<typename T1::elem_type>&    score_out,
+         Col<typename T1::pod_type>&     latent_out,
+         Col<typename T1::elem_type>&    tsquared_out,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  const bool status = op_princomp::direct_princomp(coeff_out, score_out, latent_out, tsquared_out, X);
+  
+  if(status == false)
+    {
+    coeff_out.soft_reset();
+    score_out.soft_reset();
+    latent_out.soft_reset();
+    tsquared_out.soft_reset();
+    
+    arma_debug_warn_level(3, "princomp(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! \brief
+//! principal component analysis -- 3 arguments version
+//! coeff_out    -> principal component coefficients
+//! score_out    -> projected samples
+//! latent_out   -> eigenvalues of principal vectors
+template<typename T1>
+inline
+bool
+princomp
+  (
+         Mat<typename T1::elem_type>&    coeff_out,
+         Mat<typename T1::elem_type>&    score_out,
+         Col<typename T1::pod_type>&     latent_out,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  const bool status = op_princomp::direct_princomp(coeff_out, score_out, latent_out, X); 
+  
+  if(status == false)
+    {
+    coeff_out.soft_reset();
+    score_out.soft_reset();
+    latent_out.soft_reset();
+    
+    arma_debug_warn_level(3, "princomp(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! \brief
+//! principal component analysis -- 2 arguments version
+//! coeff_out    -> principal component coefficients
+//! score_out    -> projected samples
+template<typename T1>
+inline
+bool
+princomp
+  (
+         Mat<typename T1::elem_type>&    coeff_out,
+         Mat<typename T1::elem_type>&    score_out,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  const bool status = op_princomp::direct_princomp(coeff_out, score_out, X); 
+  
+  if(status == false)
+    {
+    coeff_out.soft_reset();
+    score_out.soft_reset();
+    
+    arma_debug_warn_level(3, "princomp(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! \brief
+//! principal component analysis -- 1 argument version
+//! coeff_out    -> principal component coefficients
+template<typename T1>
+inline
+bool
+princomp
+  (
+         Mat<typename T1::elem_type>&    coeff_out,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  const bool status = op_princomp::direct_princomp(coeff_out, X);
+  
+  if(status == false)
+    {
+    coeff_out.soft_reset();
+    
+    arma_debug_warn_level(3, "princomp(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+inline
+const Op<T1, op_princomp>
+princomp
+  (
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  return Op<T1, op_princomp>(X.get_ref());
+  }
+
+
+
+//! @}