Extending a vectors length with zeros

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Chameleon17
Chameleon17 on 13 Oct 2015
Edited: Tongyao Pu on 17 Oct 2019
Good Afternoon,
I'm trying to extend the length of a vector, say it is 1x3 double. and I want it to be the same length as another vector which is say 1x8 double. I would like to pad it out with zeros but I do not have the image processor application. Is there a simple way to do this?
Thanks you for any help and time you have to spare!

Answers (2)

Jan
Jan on 13 Oct 2015
x = rand(1, 3);
y = rand(1, 8);
x(length(y)) = 0;
This fills all elements from length(x)+1 to length(y) with zeros.
  1 Comment
Tongyao Pu
Tongyao Pu on 17 Oct 2019
Edited: Tongyao Pu on 17 Oct 2019
Ed: I tried again and it works. I think the concept of your code is a bit different.
x(length(y)) = 0;
This only assigns the last number to 0. But because it extended the length of x, matlab assign all the other positions to 0.
For example, if I try;
X(length(y)) = NaN;
It only assigns the last number to NaN. If I want to extend the length of x with NaNs, I need to write:
x(length(x)+1:length(y)) = NaN;
Anyway, thank you for your answer, it inspires me a lot!
Hi, that’s a brilliant solution, but is there a way to store it in a new variable? I copied the variable again
x2 = x;
but was wondering if there is a more direct way?
Also, instead of assign it to 0, can I assign it to NaN (I tried the same code but it still turns out to be 0s)?
Thanks

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Manolis Michailidis
Manolis Michailidis on 13 Oct 2015
Edited: Manolis Michailidis on 13 Oct 2015
Lets assume x(1x3) and y(1x8)
Padd=[x,zeros(1,length(y)-length(x))];
  2 Comments
Chameleon17
Chameleon17 on 13 Oct 2015
Edited: Chameleon17 on 13 Oct 2015
OH!!!! Thank you thank you thank you!!!
That's just great! Thank you so much!!!
Manolis Michailidis
Manolis Michailidis on 13 Oct 2015
If it helped please accept the answer

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