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

I have copied three matrices generated in Python to Matlab.

Matlab however tells me that for the Y0 matrix:

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

Error in Y0Y1Y2 (line 3) Y0=[[0.-20.j , 0. +0.j , 0. +0.j , 0. +0.j ],

If I delete Y0, Y1 and Y2 are fine. There is just something wrong with Y0, but I can't understand what.

Y0=[[0.-20.j        , 0. +0.j        , 0. +0.j        , 0. +0.j        ],
    [0. +0.j        , 0.-12.j        , 0. +2.j        , 0. +0.j        ],
    [0. +0.j        , 0. +2.j        , 0.-12.j        , 0. +0.j        ],
    [0. +0.j        , 0. +0.j        , 0. +0.j        , 0. -2.85714286j]]

Y1=[[0.-12.68115942j, 0. +8.33333333j, 0. +0.j        , 0. +0.j        ],
    [0. +8.33333333j, 0.-15.j        , 0. +6.66666667j, 0. +0.j        ],
    [0. +0.j        , 0. +6.66666667j, 0.-15.j        , 0. +8.33333333j],
    [0. +0.j        , 0. +0.j        , 0. +8.33333333j, 0.-12.5j       ]]

Y2=[[0.-16.02564103j, 0. +8.33333333j, 0. +0.j        , 0. +0.j        ],
    [0. +8.33333333j, 0.-15.j        , 0. +6.66666667j, 0. +0.j        ],
    [0. +0.j        , 0. +6.66666667j, 0.-15.j        , 0. +8.33333333j],
    [0. +0.j        , 0. +0.j        , 0. +8.33333333j, 0.-15.47619048j]]

[Torsten]

And where do you try to concatenate the three matrices ? Please show us your code.

If you want the vectors in Y0 to be concatenated vertically to form a matrix, remove the [] around the vectors and replace the , at the end of each line by ; ...

Further in Matlab, a complex number must be written as a+b*j , not only a+ bj.

[Peter Jan]

That is the whole point. I am not concatenating any matrices. The code above is my code. I am just declaring three matrices, Y0, Y1 and Y2. Matlab tells me there is something wrong with Y0.

But Y1 and Y2 is declared exactly the same as Y0.

If I delete Y0. No problem. Matlab doesn't complain about Y1 and Y2. I have even tried to declare Y0 last. Then it skips over Y1 and Y2, seemingly correct, but tells me there is a "vertcat" error in the Y0 declaration.

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in Y0Y1Y2 (line 15)

Y0=[[0.-20.j , 0. +0.j , 0. +0.j , 0. +0.j ],

So the declaration of Y1 and Y2 is fine, but not Y0.

%The Y0, Y1 and Y2 matrices for Exam Assignment 3

Y1=[[0.-12.68115942j, 0. +8.33333333j, 0. +0.j        , 0. +0.j        ],
    [0. +8.33333333j, 0.-15.j        , 0. +6.66666667j, 0. +0.j        ],
    [0. +0.j        , 0. +6.66666667j, 0.-15.j        , 0. +8.33333333j],
    [0. +0.j        , 0. +0.j        , 0. +8.33333333j, 0.-12.5j       ]]

Y2=[[0.-16.02564103j, 0. +8.33333333j, 0. +0.j        , 0. +0.j        ],
    [0. +8.33333333j, 0.-15.j        , 0. +6.66666667j, 0. +0.j        ],
    [0. +0.j        , 0. +6.66666667j, 0.-15.j        , 0. +8.33333333j],
    [0. +0.j        , 0. +0.j        , 0. +8.33333333j, 0.-15.47619048j]]

Y0=[[0.-20.j        , 0. +0.j        , 0. +0.j        , 0. +0.j        ],
    [0. +0.j        , 0.-12.j        , 0. +2.j        , 0. +0.j        ],
    [0. +0.j        , 0. +2.j        , 0.-12.j        , 0. +0.j        ],
    [0. +0.j        , 0. +0.j        , 0. +0.j        , 0. -2.85714286j]]

[Torsten]

Ok, then do the necessary changes to Y0, Y1 and Y2 I explained in my answer:

Remove the [] around the vectors, replace the , at the end of each line by ; ... and write a+1i*b for the complex numbers instead of a+bj (without spaces, as G A observed).

[Peter Jan]

It actually works with the [] and the , as it was, it was just the spaces between the numbers where Matlab uses , and spaces which was the problem. But thank you very much for your time!

Answer 1

[G A]

It seams that if there is a space between the real and imaginary parts of the number, Matlab considers it as two different numbers. So rewrite your matrices without spaces.

% with spaces
[0.-20.j        , 0. +0.j        , 0. +0.j        , 0. +0.j        ]
ans =
  Column 1
                          0 -                    20i
  Column 2
                          0 +                     0i
  Column 3
                          0 +                     0i
  Column 4
                          0 +                     0i
  Column 5
                          0 +                     0i
  Column 6
                          0 +                     0i
  Column 7
                          0 +                     0i
% without spaces                          
 [0.-20.j        , 0.+0.j        , 0.+0.j        , 0.+0.j        ]
ans =
  Column 1
                          0 -                    20i
  Column 2
                          0 +                     0i
  Column 3
                          0 +                     0i
  Column 4
                          0 +                     0i                          

[Peter Jan]

Thank you very much! I didn't thought is will mix the use of spaces and commas. So actually my definition of Y1 and Y2 was also wrong. Thanks again.

[G A]

You are welcome! I have just learned this behaviour myself - thank you too!