矩阵中元素是均是变量,如何在matlab中定义它,
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矩阵中元素是均是变量,如何在matlab中定义它,
![矩阵中元素是均是变量,如何在matlab中定义它,](/uploads/image/z/7310746-10-6.jpg?t=%E7%9F%A9%E9%98%B5%E4%B8%AD%E5%85%83%E7%B4%A0%E6%98%AF%E5%9D%87%E6%98%AF%E5%8F%98%E9%87%8F%2C%E5%A6%82%E4%BD%95%E5%9C%A8matlab%E4%B8%AD%E5%AE%9A%E4%B9%89%E5%AE%83%2C)
可以考虑如下定义方式:
>> syms a b c d %%%%% 定义符号变量
>> A = [a b;c d] %%%%% 产生矩阵
A =
[ a, b]
[ c, d]
>> subs(A,{a,b,c,d},{1 2 3 4}) %%%%%%% 变量赋值
ans =
1 2
3 4
补充回答,也可以采用结构变量的方法,例如:
>> A = struct('x1',0,'x2',0,'x3',0,'x4',0); %%%%%% 定义结构变量A,并初始化
>> B = [A.x1 A.x2;A.x3 A.x4] %%%%%% 获取初始化矩阵
B =
0 0
0 0
>> A.x1 = 5; %%%%%% 变量赋值
>> A.x2 = 6;
>> A.x3 = 7;
>> A.x4 = 8;
>> B = [A.x1 A.x2;A.x3 A.x4] %%%%% 新矩阵
B =
5 6
7 8
>> syms a b c d %%%%% 定义符号变量
>> A = [a b;c d] %%%%% 产生矩阵
A =
[ a, b]
[ c, d]
>> subs(A,{a,b,c,d},{1 2 3 4}) %%%%%%% 变量赋值
ans =
1 2
3 4
补充回答,也可以采用结构变量的方法,例如:
>> A = struct('x1',0,'x2',0,'x3',0,'x4',0); %%%%%% 定义结构变量A,并初始化
>> B = [A.x1 A.x2;A.x3 A.x4] %%%%%% 获取初始化矩阵
B =
0 0
0 0
>> A.x1 = 5; %%%%%% 变量赋值
>> A.x2 = 6;
>> A.x3 = 7;
>> A.x4 = 8;
>> B = [A.x1 A.x2;A.x3 A.x4] %%%%% 新矩阵
B =
5 6
7 8