MATLAB Answers

Adding elements to an array

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Frandy
Frandy 2011년 9월 21일
댓글: Gonzalo Mata 2018년 11월 22일
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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topdawgnate
topdawgnate 2011년 9월 21일
편집: MathWorks Support Team 2018년 11월 8일
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 2018년 11월 22일
and wich of them is the faster one?

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YU-CHENG HUANG
YU-CHENG HUANG 2017년 9월 29일
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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