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Adding elements to an array

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Frandy
Frandy on 21 Sep 2011
Commented: Gonzalo Mata on 22 Nov 2018
Ok, so how do you place elements of one array into another array, so that they are included in either the beginning of the array or the end of the array?

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Accepted Answer

topdawgnate
topdawgnate on 21 Sep 2011
Edited: MathWorks Support Team on 8 Nov 2018
There are many ways to join elements of two arrays. For example, let’s say you have two 2-by-2 matrices A and B:
A = [1 2; 3 4];
B = [5 6; 7 8];
Then the following commands concatenate B to the end of A horizontally:
H1 = [A B]
H2 = horzcat(A,B)
H3 = cat(2,A,B)
The first argument in the cat function (2) tells it to add B as additional columns of A.
These commands concatenate B to the end of A vertically:
V1 = [A; B]
V2 = vertcat(A,B)
V3 = cat(1,A,B)
The 1 tells cat to add B as additional rows of A.
For additional concatenation examples, see:

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Gonzalo Mata
Gonzalo Mata on 22 Nov 2018
and wich of them is the faster one?

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More Answers (1)

YU-CHENG HUANG
YU-CHENG HUANG on 29 Sep 2017
just using c = [a , b]
ex: a = [1 2 3] b = [4 5 6] c = [a,b]
--> c = [1 2 3 4 5 6]

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