CODEWITHSUNDEEP
matlab
Preeti Singh
Preeti Singh

Reputation: 35

Concatenate different length vectors

I am having difficulty concatenating vectors in MATLAB.

A = [1
     2
     3]

B = [6
     7
     8
     9
     10]

Desired result:

C = [1
     2
     3
     6 
     7                
     8
     9
     10]

where the sizes of A and B are different in every iteration of my script and I want to form the concatenated resulting vector, C, which has a dynamic size.

This is what I have tried:

matlab snapshot

Upvotes: 1

Views: 3444

Answers (3)

bremen_matt
bremen_matt

Reputation: 7339

The fool-proof way is this:

C = [A(:);B(:)];

If you use this method then it does not matter if A and B are row vectors, column vectors, or even matrices.

Upvotes: 0

roadRunner
roadRunner

Reputation: 110

Try:

A = [1 2 3];
B = [4 5 6 7 8 9 10];

C = [A B]

For vertical vectors A' and B' use:

C = [A;B]

Upvotes: 0

Wolfie
Wolfie

Reputation: 30047

A = [1
     2
     3];

B = [6
     7
     8
     9
     10];

Vertical concatenation of two vectors/matrices is what you want, done like this...

C = [A; B];

... or this...

C = [A
     B];

... or this...

C = vertcat(A,B);

All three of these give

C = [1
     2
     3
     6
     7 
     8
     9
     10]

% As you requested...

You were running into trouble because you were trying to use horzcat

C = horzcat(A',B');

Horizontal concatenation merges matrices horizontally, i.e.

C = [1, 6
     2, 7
     3, 8
     ?, 9
     ?, 10]

So to avoid this, you've transposed the matrices to make them rows instead of columns, then transposed the result back?? You just need vertcat! I have shown the shorthand and full form for this above.

Upvotes: 3

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