What this error 'Dimensions of arrays being concatenated are not consistent' means?

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in Make_forward_model (line 85)

Vpar = [Vpar.'; 0];

Does it Vpar = [Vpar.'; 0]; to take the transpose?

[SALAH ALRABEEI]

why "Vpar." not just "Vpar"!!

[SALAH ALRABEEI]

If the dimension of Vpar is >1, you cannot concate it with 0. If it is just one array, you can try this instead.

    % 
  Vpar(end+1) = 0;

Answer 1

[Abhinav Gupta]

This type of error is encountered when we try to vertically concatenate arrays that do not have compatible sizes. As an example, lets say we have 2 matrices A and B. To vertically concatenate them, they must have equal number of columns

>> A = ones(2,3);
>> B = zeros(4,3);
>> C = [A;B]

C =

     1     1     1
     1     1     1
     0     0     0
     0     0     0
     0     0     0
     0     0     0

And if we mismatch the number of columns in A and B, and concatenate them, we get this error.

>> B = zeros(2,2)

B =

     0     0
     0     0

>> C = [A;B]
Error using vertcat
Dimensions of arrays being concatenated are not consistent.

For more information, you could refer to this documentation page:

Creating, Concatenating, and Expanding Matrices - MATLAB & Simulink - MathWorks India

Hope this helps.

Answer 2

[Image Analyst]

It's thoroughly discussed in the FAQ:

https://matlab.fandom.com/wiki/FAQ#.E2.80.9CDimensions_of_arrays_being_concatenated_are_not_consistent..E2.80.9D