If I let A, B, and C be 2x2 matrices, is it possible for me to assign a label to each matrix element in matrix C where C = A*B?

Question

Craig Egan Allistair Tan 2022-6-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1733695-if-i-let-a-b-and-c-be-2x2-matrices-is-it-possible-for-me-to-assign-a-label-to-each-matrix-element

评论： Sam Chak 2022-6-4

采纳的回答： Matt J

Let A, B, and C be separate 2x2 matrices. In this case, we let matrix C = A*B.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Sam Chak 2022-6-4

在 MATLAB Online 中打开

Can you give an example? Like...

A = [1 2; 3 4]

A =

1 2

3 4

B = [5 6; 7 8]

B =

5 6

7 8

C = A*B

C =

19 22

43 50

det(C)

ans = 4.0000

Craig Egan Allistair Tan 2022-6-4

Something like in matrix C, we let C11 = 19, C12 = 22, C21 = 43, and C22 = 50.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2022-6-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1733695-if-i-let-a-b-and-c-be-2x2-matrices-is-it-possible-for-me-to-assign-a-label-to-each-matrix-element#answer_978800

编辑：Matt J 2022-6-4

在 MATLAB Online 中打开

I'm talking about assigning a variable to each matrix element

One way,

A=rand(2);
B=rand(2);
C=A*B,
C = 2×2
    0.2598    0.3906
    0.5097    0.7454
tmp=num2cell(C);
[c1,c2,c3,c4]=deal(tmp{:})
c1 = 0.2598
c2 = 0.5097
c3 = 0.3906
c4 = 0.7454

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2022-6-4

Note that changing the c* variables will not change the matrix. The above code does not define the c* variables as being "references" to the array elements, only as copies of the array elements. There is no way to create references to individual elements of a numeric array.

请先登录，再进行评论。

Answer 2

Matt J 2022-6-4

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1733695-if-i-let-a-b-and-c-be-2x2-matrices-is-it-possible-for-me-to-assign-a-label-to-each-matrix-element#answer_978975

编辑：Matt J 2022-6-4

在 MATLAB Online 中打开

myclass.m

The attached class might be what you are looking for, if all you want to do are the operations C=A*B. To understand what it's doing, you need to get familiar with handle classes.

A=myclass(rand(2)), B=myclass(rand(2)),
A = 
    0.7690    0.7854
    0.5502    0.8403
B = 
    0.6974    0.3235
    0.7494    0.6334
C=A*B
C = 
    1.1248    0.7462
    1.0134    0.7102
c12=C(1,2)
c12 = 
    0.7462
C(1,2)=3
C = 
    1.1248    3.0000
    1.0134    0.7102
c12
c12 = 
     3