max@0: // Copyright (C) 2008-2011 NICTA (www.nicta.com.au)
max@0: // Copyright (C) 2008-2011 Conrad Sanderson
max@0: // 
max@0: // This file is part of the Armadillo C++ library.
max@0: // It is provided without any warranty of fitness
max@0: // for any purpose. You can redistribute this file
max@0: // and/or modify it under the terms of the GNU
max@0: // Lesser General Public License (LGPL) as published
max@0: // by the Free Software Foundation, either version 3
max@0: // of the License or (at your option) any later version.
max@0: // (see http://www.opensource.org/licenses for more info)
max@0: 
max@0: 
max@0: //! \addtogroup fn_misc
max@0: //! @{
max@0: 
max@0: 
max@0: 
max@0: //! \brief
max@0: //! Generate a vector with 'num' elements.
max@0: //! The values of the elements linearly increase from 'start' upto (and including) 'end'.
max@0: 
max@0: template<typename vec_type>
max@0: inline
max@0: vec_type
max@0: linspace
max@0:   (
max@0:   const typename vec_type::pod_type start,
max@0:   const typename vec_type::pod_type end,
max@0:   const uword num = 100u,
max@0:   const typename arma_Mat_Col_Row_only<vec_type>::result* junk = 0
max@0:   )
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   arma_ignore(junk);
max@0:   
max@0:   typedef typename vec_type::elem_type eT;
max@0:   typedef typename vec_type::pod_type   T;
max@0:   
max@0:   vec_type x;
max@0:     
max@0:   if(num >= 2)
max@0:     {
max@0:     x.set_size(num);
max@0:     
max@0:     eT* x_mem = x.memptr();
max@0:     
max@0:     const uword num_m1 = num - 1;
max@0:     
max@0:     if(is_non_integral<T>::value == true)
max@0:       {
max@0:       const T delta = (end-start)/T(num_m1);
max@0:       
max@0:       for(uword i=0; i<num_m1; ++i)
max@0:         {
max@0:         x_mem[i] = eT(start + i*delta);
max@0:         }
max@0:       
max@0:       x_mem[num_m1] = eT(end);
max@0:       }
max@0:     else
max@0:       {
max@0:       const double delta = (end >= start) ? double(end-start)/double(num_m1) : -double(start-end)/double(num_m1);
max@0:       
max@0:       for(uword i=0; i<num_m1; ++i)
max@0:         {
max@0:         x_mem[i] = eT(double(start) + i*delta);
max@0:         }
max@0:       
max@0:       x_mem[num_m1] = eT(end);
max@0:       }
max@0:     
max@0:     return x;
max@0:     }
max@0:   else
max@0:     {
max@0:     x.set_size(1);
max@0:     
max@0:     x[0] = eT(end);
max@0:     }
max@0:   
max@0:   return x;
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: inline
max@0: mat
max@0: linspace(const double start, const double end, const uword num = 100u)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   return linspace<mat>(start, end, num);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //
max@0: // log_add
max@0: 
max@0: template<typename eT>
max@0: inline
max@0: typename arma_float_only<eT>::result
max@0: log_add(eT log_a, eT log_b)
max@0:   {
max@0:   if(log_a < log_b)
max@0:     {
max@0:     std::swap(log_a, log_b);
max@0:     }
max@0:   
max@0:   const eT negdelta = log_b - log_a;
max@0:   
max@0:   if( (negdelta < Math<eT>::log_min()) || (arma_isfinite(negdelta) == false) )
max@0:     {
max@0:     return log_a;
max@0:     }
max@0:   else
max@0:     {
max@0:     #if defined(ARMA_HAVE_LOG1P)
max@0:       return (log_a + log1p(std::exp(negdelta)));
max@0:     #else
max@0:       return (log_a + std::log(1.0 + std::exp(negdelta)));
max@0:     #endif
max@0:     }
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename eT>
max@0: arma_inline
max@0: arma_warn_unused
max@0: bool
max@0: is_finite(const eT x, const typename arma_scalar_only<eT>::result* junk = 0)
max@0:   {
max@0:   arma_ignore(junk);
max@0:   
max@0:   return arma_isfinite(x);
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: arma_warn_unused
max@0: bool
max@0: is_finite(const Base<typename T1::elem_type,T1>& X)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   typedef typename T1::elem_type eT;
max@0:   
max@0:   const unwrap<T1>   tmp(X.get_ref());
max@0:   const Mat<eT>& A = tmp.M;
max@0:   
max@0:   return A.is_finite();
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: inline
max@0: arma_warn_unused
max@0: bool
max@0: is_finite(const BaseCube<typename T1::elem_type,T1>& X)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   typedef typename T1::elem_type eT;
max@0:   
max@0:   const unwrap_cube<T1> tmp(X.get_ref());
max@0:   const Cube<eT>& A =   tmp.M;
max@0:   
max@0:   return A.is_finite();
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: template<typename T1>
max@0: arma_inline
max@0: Op<T1, op_sympd>
max@0: sympd(const Base<typename T1::elem_type,T1>& X)
max@0:   {
max@0:   arma_extra_debug_sigprint();
max@0:   
max@0:   return Op<T1, op_sympd>(X.get_ref());
max@0:   }
max@0: 
max@0: 
max@0: 
max@0: //! @}