diff --git a/src/extra/use_armadillo_ex.cpp b/src/extra/use_armadillo_ex.cpp
index eaf5666..95ffe3a 100644
--- a/src/extra/use_armadillo_ex.cpp
+++ b/src/extra/use_armadillo_ex.cpp
@@ -29,13 +29,17 @@
 // To compile the code, use: g++ use_armadillo_ex.cpp -larmadillo
 #define GCTL_USE_ARMADILLO
 
+#include "gctl/core/array_algorithm.h"
+#include "gctl/core/matrix_algorithm.h"
 #include "gctl/core/armadillo_wrapper.h"
 
 using namespace gctl;
 
 int main(int argc, char const *argv[])
 {
-    _1d_array a(10, 1, 0.5);
+    /*
+    _1d_array a(10);
+    sequence(a, 1.0, 0.5);
     a.show();
 
     arma::Col<double> b;
@@ -54,7 +58,7 @@ int main(int argc, char const *argv[])
     a.show();
 
     matrix<double> m(10, 10);
-    m.random_float(1.0, 2.0, RdUniform); 
+    random_float(m, 1.0, 2.0, RdUniform);
     m.show();
 
     arma::Mat<double> amat;
@@ -66,5 +70,17 @@ int main(int argc, char const *argv[])
     _1d_array v;
     armaCol2array(r, v);
     v.show();
+    */
+
+    // 定义系数矩阵 A 和常数向量 b
+    arma::mat A = { {2.0, 1.0}, {1.0, 3.0} };
+    arma::vec b = { {5.0, 6.0} };
+
+    // 求解线性方程组 Ax = b
+    arma::vec x = arma::solve(A, b, arma::solve_opts::fast);
+
+    _1d_array c;
+    armaCol2array(x, c);
+    c.show();
     return 0;
 }
diff --git a/src/extra/use_eigen_ex.cpp b/src/extra/use_eigen_ex.cpp
index 032bfd2..4546f2d 100644
--- a/src/extra/use_eigen_ex.cpp
+++ b/src/extra/use_eigen_ex.cpp
@@ -29,13 +29,16 @@
 // To compile the code, use: g++ use_eigen_ex.cpp -I<path-to-eigen3>
 #define GCTL_USE_EIGEN3
 
+#include "gctl/core/array_algorithm.h"
+#include "gctl/core/matrix_algorithm.h"
 #include "gctl/core/eigen_wrapper.h"
 
 using namespace gctl;
 
 int main(int argc, char const *argv[])
 {
-    _1d_array a(10, 1, 0.5);
+    _1d_array a(10);
+    sequence(a, 1.0, 0.5);
     a.show();
 
     Eigen::VectorXd b;
@@ -50,7 +53,7 @@ int main(int argc, char const *argv[])
     c.show();
 
     _2d_matrix m(5, 6);
-    m.random_float(1, 2, RdUniform);
+    random_float(m, 1.0, 2.0, RdUniform);
     m.show();
 
     Eigen::MatrixXd mat;