how to insert an element into any index of vector?

Question

Aswin Sandirakumaran 2018-5-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/402575-how-to-insert-an-element-into-any-index-of-vector

评论： Muhammad Bilal 2022-12-19

CASE 1 :

 A = [540] 
 B = [0,15]
How to insert B(1) as A(1) and B(2) as A(3)  ===>>>  OUTPUT SHOULD BE LIKE:  A = [0,540,15]

Case 2 :

 A = [0,540] 
 B = 15
How to insert B(1) as A(3) ===>>>  OUTPUT SHOULD BE LIKE:  A = [0,540,15]

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Answer 1

Ameer Hamza 2018-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/402575-how-to-insert-an-element-into-any-index-of-vector#answer_321949

编辑：Ameer Hamza 2018-5-25

在 MATLAB Online 中打开

These are very basic concepts in MATLAB vector creation and its indexing. You can go through these links to know how to do these things.

For example in the first case,

 A = [540]; 
 B = [0,15];
 A = [B(1) A B(2)]
 A =
     0   540    15

In the second case

 A = [0,540];
 B = 15;
 A = [A B]
 A = [A B]
 A =
     0   540    15

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Ameer Hamza 2018-5-26

There are general methods available. You need to read the documentation at the links I provided in the answer.

George Revell 2021-11-28

编辑：George Revell 2021-11-28

Excuse me, but your method of creating a collection by defining it in terms of parts of other collections, if you tried to put that in a loooooong forloop, you would end up with an absolutely apauling time complexity to finish execution. While you are techinically correct that your method works, it has such a terrible time complexity that obviously it could only be used for relatively small collections. if instead one of the arrays had a dimension beyond n = 10000, well good luck running this algorithm...

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Answer 2

Iskandar Ars 2021-12-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/402575-how-to-insert-an-element-into-any-index-of-vector#answer_859445

在 MATLAB Online 中打开

v = 1:10; %new vector
i = 5; % index to insert
b = 15; % the number you want to insert
v = [v(1:i-1) b v(i:end)] % insert
v = 1×11
     1     2     3     4    15     5     6     7     8     9    10