How to create this matrix ?

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Akash Pal
Akash Pal 2022-7-10
编辑： John D'Errico 2022-7-10
I have a matrix whose size is 2x5x2 double and i have another matrix which is 2X5 double ,i just want to add together and make a simple matrix A,
in this A matrix there will be 2 rows ,total 15 column .
  2 个评论
Sam Chak
Sam Chak 2022-7-10
Hi @Akash Pal
Can you really add matrices of incompatible sizes?
Akash Pal
Akash Pal 2022-7-10
yes i know its impossible but if there is any solution .

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采纳的回答

John D'Errico
John D'Errico 2022-7-10
编辑：John D'Errico 2022-7-10
Ran in:
It appears the request was to concatenate the two planes of A into one plane, and then concatenate another matrix to the columns of the result. So it would appear the word add was used in a suggestively wrong way. And since concatenation is the only way one could reasonably manipulate a 2x5x2 array, with another 2x5 array, to finally create a 2x15 result, that must surely be the case.
A = randi(5,[2,5,2])
A =
A(:,:,1) = 2 5 5 1 5 2 4 5 5 2 A(:,:,2) = 2 5 3 5 2 2 5 4 1 5
B = randi([6,10],[2,5])
B = 2×5
9 10 7 9 6 7 8 7 7 6
So we have two matrices of the desires sizes.
Concatenation is easy. We could either first reshape A using the reshape function, or just extract the two planes of A. The latter is easier.
C = [A(:,:,1),A(:,:,2),B]
C = 2×15
2 5 5 1 5 2 5 3 5 2 9 10 7 9 6 2 4 5 5 2 2 5 4 1 5 7 8 7 7 6
However, reshape would have also worked, if we then used concatenation.
D = [reshape(A,[2,10]),B]
D = 2×15
2 5 5 1 5 2 5 3 5 2 9 10 7 9 6 2 4 5 5 2 2 5 4 1 5 7 8 7 7 6
As you can see, both operations worked nicely enough. If the matrix A had many planes, then reshape would be the better option.
Finally, it is crucially important to understand how the elements of a matrix are stored internally before/when you use reshape.

更多回答（1 个）

Sam Chak
Sam Chak 2022-7-10
Ran in:
@Akash Pal
Despite the Matrix Law forbids the operation, we can nearly always perform miracles with MATLAB, so long as you give the example of the desired output. Given M and N, how do you want to display the output of
M(:,:,1) = [1 2 3 4 5; 6 7 8 9 10];
M(:,:,2) = 2*[1 2 3 4 5; 6 7 8 9 10];
M
M =
M(:,:,1) = 1 2 3 4 5 6 7 8 9 10 M(:,:,2) = 2 4 6 8 10 12 14 16 18 20
N = 3*M(:,:,1)
N = 2×5
3 6 9 12 15 18 21 24 27 30

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