Merging empty vector with double

Question

Joel 2023-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1946378-merging-empty-vector-with-double

回答： Stephen23 2023-4-13

采纳的回答： Stephen23

Hi

I have two vectors:

9x1

A=[1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9]

B=[]

I want to compare A and B in the same matrix. Like

9x2

C=[A B];

But B is empty, How can I display this in the same matrix?.

The length of the vectors will vary, so the number of rows in C should be the same as the longest vector out of A and B.

2 个评论
显示无隐藏无

Stephen23 2023-4-13

编辑：Stephen23 2023-4-13

"How can I display this in the same matrix?."

Display what exactly?

Numeric matrices cannot have "holes" in them, so what value/s would you put in the "empty" locations? By default, numeric matrices are filled with zeros, which then could not be distinguished from zeros from your actual data.

Joel 2023-4-13

yes so if B is empty, I want it to be shown as 9 zeros or 9 ones if thats better

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2023-4-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1946378-merging-empty-vector-with-double#answer_1215003

在 MATLAB Online 中打开

"if B is empty, I want it to be shown as 9 zeros"

A = [1;2;3;4;5;6;7;8;9];
B = [];
C = [];
C(1:numel(A),1) = A;
C(1:numel(B),2) = B
C = 9×2
     1     0
     2     0
     3     0
     4     0
     5     0
     6     0
     7     0
     8     0
     9     0