Error using vertcat Dimensions of arrays being concatenated are not consistent.

Question

Jerico Yabut 2020-9-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/594871-error-using-vertcat-dimensions-of-arrays-being-concatenated-are-not-consistent

回答： VBBV 2021-12-9

   matrix1 = input("matrix 1 is \n");
   matrix2 = input("matrix 2 is \n");
   
   [M, N] = size(matrix1);
   [P, Q] = size(matrix2');
   if N == P
      X = matrix1*matrix2
      disp(X)
   else
      fprintf("Matrix multiplication can't be done.")
   end

This is my code and we are tasked to do simple multiplication of matrices. This works fine in 2x2 or 1x1 or even 16x16 matrices but when it comes to 1x3 or 3x4 or 5x7, it doesnt work anymore. Thank you for answering

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KSSV 2020-9-16

What is c, d, I, J? Variables are not defined, how do you expect us to help you?

Jerico Yabut 2020-9-16

Thanks for pointing that out. I already edited it.

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Answer 1

David Hill 2020-9-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/594871-error-using-vertcat-dimensions-of-arrays-being-concatenated-are-not-consistent#answer_495703

在 MATLAB Online 中打开

   matrix1 = input("matrix 1 is \n");
   matrix2 = input("matrix 2 is \n");
   
   [M, N] = size(matrix1);
   [P, Q] = size(matrix2);
   if N == P
      X = matrix1*matrix2;
      disp(X)
   else
      fprintf("Matrix multiplication can't be done.")
   end

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Jerico Yabut 2020-9-16

I tried this however it doesn't work at 1x3 or 4x1 or 5x7. It only works on let's just say 4x4 or 2x2 or 10x10.it says that "Error using vertcat Dimensions of arrays being concatenated are not consistent."

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Answer 2

VBBV 2021-12-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/594871-error-using-vertcat-dimensions-of-arrays-being-concatenated-are-not-consistent#answer_851455

在 MATLAB Online 中打开

   matrix1 = rand(1,3)%input("matrix 1 is \n");  This is example of 1 x3 matrix 
matrix1 = 1×3
    0.7567    0.2314    0.3456
   matrix2 = rand(3,3)%input("matrix 2 is \n");
matrix2 = 3×3
    0.2531    0.3500    0.0379
    0.0466    0.7056    0.3046
    0.0829    0.0319    0.9818
   
   [M, N] = size(matrix1);
   [P, Q] = size(matrix2);
   if N == P
      disp('The product is ') 
      X = matrix1.*matrix2
   
   else
      fprintf("Matrix multiplication can't be done.")
   end
The product is 
X = 3×3
    0.1915    0.0810    0.0131
    0.0353    0.1633    0.1053
    0.0627    0.0074    0.3393