MATLAB Answers

## How to stick on/augmenting a vector into the matrix?

Asked by Isti

### Isti (view profile)

on 26 Apr 2012
Latest activity Commented on by Walter Roberson

### Walter Roberson (view profile)

on 17 Apr 2017
Accepted Answer by Walter Roberson

### Walter Roberson (view profile)

If i have a matrix like this:
2 1 4 6 2
9 4 6 1 2
5 3 2 8 3
7 2 1 9 3
7 1 8 2 4
3 5 4 1 2
then i want to stick on a vektor contain of "1" in the beginning of that matrix. so it'll be like this:
1 2 1 4 6 2
1 9 4 6 1 2
1 5 3 2 8 3
1 7 2 1 9 3
1 7 1 8 2 4
1 3 5 4 1 2
what to do? thanks before :')

Ashley Velasco

### Ashley Velasco (view profile)

on 17 Apr 2017
I'm a student just learning how to use MATLAB... but I'm pretty sure you can use the horzcat function to do it easily. Matlab has documentation on it.
https://www.mathworks.com/help/matlab/ref/horzcat.html
Walter Roberson

### Walter Roberson (view profile)

on 17 Apr 2017
The [] operator defaults to horzcat, so the solution I listed
[ones(size(TheMatrix,1),1), TheMatrix]
is really the same as
horzcat( ones(size(TheMatrix,1),1), TheMatrix)

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## 3 Answers

### Walter Roberson (view profile)

Answer by Walter Roberson

### Walter Roberson (view profile)

on 26 Apr 2012
Accepted Answer

NewMatrix = [ones(size(TheMatrix,1),1), TheMatrix];

Isti

### Isti (view profile)

on 26 Apr 2012
i'm sorry but it's not suitable in my case. is there any?
thanks
Walter Roberson

### Walter Roberson (view profile)

on 26 Apr 2012
Sorry, I've corrected.

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Answer by Isti

### Isti (view profile)

on 26 Apr 2012

then the result is like this:
1 1 1 1 1 1 2 1 4 6 2
1 1 1 1 1 1 9 4 6 1 2
1 1 1 1 1 1 5 3 2 8 3
1 1 1 1 1 1 7 2 1 9 3
1 1 1 1 1 1 7 1 8 2 4
1 1 1 1 1 1 3 5 4 1 2
is there another solution?

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Answer by ike

### ike (view profile)

on 26 Apr 2012

yours= [ 2 1 4 6 2; 9 4 6 1 2; 5 3 2 8 3; 7 2 1 9 3; 7 1 8 2 4; 3 5 4 1 2]
add=ones(6,1); concat=[add yours]
try this....

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