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

Question

Peter Jan 2021-5-24

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https://ww2.mathworks.cn/matlabcentral/answers/837983-error-using-vertcat-dimensions-of-arrays-being-concatenated-are-not-consistent

评论： Peter Jan 2021-5-24

采纳的回答： G A

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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]]

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Peter Jan 2021-5-24

编辑：Peter Jan 2021-5-24

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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 2021-5-24

编辑：Torsten 2021-5-24

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 2021-5-24

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!

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Answer 1

G A 2021-5-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/837983-error-using-vertcat-dimensions-of-arrays-being-concatenated-are-not-consistent#answer_707143

编辑：G A 2021-5-24

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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                          