如何在MATLAB中手动将我以符号方式声明的变量插入到零矩阵中？

我一直在尝试将符号变量插入零矩阵

syms k1 k2 k3 k4
global_k1 = zeros(4,4);
global_k2 = zeros(4,4);
global_k3 = zeros(4,4);
global_k4 = zeros(4,4);
global_k1(1,1) =  k1;
global_k1(1,2) = -k1;
global_k1(2,1) = -k1;
global_k1(2,2) =  k1;
global_k2(2,2) =  k2;
global_k2(2,3) = -k2;
global_k2(3,2) = -k2;
global_k2(3,3) =  k2;
global_k3(2,2) =  k3;
global_k3(2,3) = -k3;
global_k3(3,2) = -k3;
global_k3(3,3) =  k3;
global_k4(2,2) =  k4;
global_k4(2,4) = -k4;
global_k4(4,2) = -k4;
global_k4(4,4) =  k4;
k_stiff = global_k1+global_k2+global_k3+global_k4;
disp('The stiffness matrix is: ');
disp(k_stiff);

当我运行程序时，它显示以下错误：

The following error occurred converting from sym to double:
Unable to convert expression into double array.

Error in HW1_1 (line 9)
global_k1(1,1) =  k1;

---

如何将符号变量添加到零矩阵中？

如果以后要替换其元素，请将它们初始化为包含零的符号矩阵。i、 e

global_k1 = sym(zeros(4,4));

---

最好是创建单个3D矩阵，而不是动态的

global_k1

、

global_k2

、

global_k3

和

global_k4

矩阵

global_k = sym(zeros(4,4,4));

---

现在

global_k（：，：，1）

将成为您的

global_k1

，依此类推。

如果以后要替换其元素，请将它们初始化为包含零的符号矩阵。i、 e

global_k1 = sym(zeros(4,4));

---

最好是创建单个3D矩阵，而不是动态的

global_k1

、

global_k2

、

global_k3

和

global_k4

矩阵

global_k = sym(zeros(4,4,4));

现在

global_k（：，：，1）

将成为您的

global_k1

等等