Error compiling mex file ubuntu with armadillo library

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Andrea Agosti
Andrea Agosti 2021-9-6
Hi!
I am trying to compile a mex file on ubuntu starting from a cpp file using the armadillo library. However, I get this strange error when joining 3 vectors and when determining if a vertor is full of zeros.
Error using mex
/home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp: In function ‘void mexFunction(int, mxArray**, int,
const mxArray**)’:
/home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:107:41: error: no matching function for call to
‘join_horiz(arma::rowvec&, arma::rowvec&, arma::rowvec&)’
rowvec out=join_horiz(vec1,vec2,vec3);
^
In file included from /usr/include/armadillo:493:0,
from /home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/armaMex.hpp:21,
from /home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:2:
/usr/include/armadillo_bits/fn_join.hpp:85:1: note: candidate: template<class T1, class T2> typename
arma::enable_if2<((arma::is_arma_type<T1>::value && arma::is_arma_type<T2>::value) && arma::is_same_type<typename
T1::elem_type, typename T2::elem_type>::value), const arma::Glue<T1, T2, arma::glue_join_rows> >::result
arma::join_horiz(const T1&, const T2&)
join_horiz(const T1& A, const T2& B)
^~~~~~~~~~
/usr/include/armadillo_bits/fn_join.hpp:85:1: note: template argument deduction/substitution failed:
/home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:107:41: note: candidate expects 2 arguments, 3
provided
rowvec out=join_horiz(vec1,vec2,vec3);
^
In file included from /usr/include/armadillo:493:0,
from /home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/armaMex.hpp:21,
from /home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:2:
/usr/include/armadillo_bits/fn_join.hpp:219:1: note: candidate: template<class T1, class T2> const arma::SpGlue<T1,
T2, arma::spglue_join_rows> arma::join_horiz(const arma::SpBase<typename T1::elem_type, T1>&, const
arma::SpBase<typename T1::elem_type, T2>&)
join_horiz(const SpBase<typename T1::elem_type,T1>& A, const SpBase<typename T1::elem_type,T2>& B)
^~~~~~~~~~
/usr/include/armadillo_bits/fn_join.hpp:219:1: note: template argument deduction/substitution failed:
/home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:107:41: note: ‘arma::rowvec {aka
arma::Row<double>}’ is not derived from ‘const arma::SpBase<typename T1::elem_type, T1>’
rowvec out=join_horiz(vec1,vec2,vec3);
^
/home/b8054452/Downloads/Copy_of_MEX_EXAMPLE_2/arma_test2.cpp:110:13: error: ‘arma::rowvec {aka class
arma::Row<double>}’ has no member named ‘is_zero’; did you mean ‘is_row’?
if(vec1.is_zero()==true)
^~~~~~~
The strange thing is that when compiling it with windows everything works as supposed.
Any idea how to fix it?
THANKS!

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