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我正在寫一個基本的有限元程序使用犰狳。我使用sp_mat和vec作爲矩陣和矢量類型。問題是，當我做solve(X, b)我得到一個錯誤。難道是solve不支持sp_mat。除了使用密集矩陣之外的其他選擇？以下是sp_mat未編譯的代碼。如果我使用註釋行mat A，它可以正常工作。犰狳：解決與sp_mat
int N = 3;
double h = 1./N;
//mat A = zeros<mat>(N+1,N+1);
sp_mat A(N+1,N+1);
for(int i=0;i<=N;i++) {
if(i>0) {A(i,i-1)=-1.;}
A(i,i)=2.;
if(i<N) {A(i,i+1)=-1.;}
}
A(N,N)=1;
vec b = zeros(N+1);
for(int i=0;i<=N;i++) {
b(i)=h;
}
vec zeta = solve(A,b);
cout << zeta;
錯誤：在犰狳
make all
Building file: ../src/FEM.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/FEM.d" -MT"src/FEM.d" -o "src/FEM.o" "../src/FEM.cpp"
../src/FEM.cpp: In function ‘int main()’:
../src/FEM.cpp:37:22: error: no matching function for call to ‘solve(arma::sp_mat&, arma::vec&)’
vec zeta = solve(A,b);
^
../src/FEM.cpp:37:22: note: candidates are:
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:25:1: note: template<class T1, class T2> const arma::Glue<T1, T2, arma::glue_solve> arma::solve(const arma::Base<typename T1::elem_type, T1>&, const arma::Base<typename T1::elem_type, T2>&, bool, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:25:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘const arma::Base<typename T1::elem_type, T1>’
vec zeta = solve(A,b);
^
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:44:1: note: template<class T1, class T2> const arma::Glue<T1, T2, arma::glue_solve> arma::solve(const arma::Base<typename T1::elem_type, T1>&, const arma::Base<typename T1::elem_type, T2>&, const char*, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:44:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘const arma::Base<typename T1::elem_type, T1>’
vec zeta = solve(A,b);
^
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:67:1: note: template<class T1, class T2> const arma::Glue<T1, T2, arma::glue_solve_tr> arma::solve(const arma::Op<T1, arma::op_trimat>&, const arma::Base<typename T1::elem_type, T2>&, bool, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:67:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘const arma::Op<T1, arma::op_trimat>’
vec zeta = solve(A,b);
^
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:87:1: note: template<class T1, class T2> const arma::Glue<T1, T2, arma::glue_solve_tr> arma::solve(const arma::Op<T1, arma::op_trimat>&, const arma::Base<typename T1::elem_type, T2>&, const char*, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:87:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘const arma::Op<T1, arma::op_trimat>’
vec zeta = solve(A,b);
^
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:110:1: note: template<class T1, class T2> bool arma::solve(arma::Mat<typename T1::elem_type>&, const arma::Base<typename T1::elem_type, T1>&, const arma::Base<typename T1::elem_type, T2>&, bool, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:110:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘arma::Mat<typename T1::elem_type>’
vec zeta = solve(A,b);
^
In file included from /usr/include/armadillo:397:0,
from ../src/FEM.cpp:10:
/usr/include/armadillo_bits/fn_solve.hpp:139:1: note: template<class T1, class T2> bool arma::solve(arma::Mat<typename T1::elem_type>&, const arma::Base<typename T1::elem_type, T1>&, const arma::Base<typename T1::elem_type, T2>&, const char*, const typename arma::arma_blas_type_only<typename T1::elem_type>::result*)
solve
^
/usr/include/armadillo_bits/fn_solve.hpp:139:1: note: template argument deduction/substitution failed:
../src/FEM.cpp:37:22: note: ‘arma::sp_mat {aka arma::SpMat<double>}’ is not derived from ‘arma::Mat<typename T1::elem_type>’
vec zeta = solve(A,b);
^
make: *** [src/FEM.o] Error 1