Extending a vectors length with zeros

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!

Answer 1

[Jan]

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.

[Tongyao Pu]

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

Answer 2

[Manolis Michailidis]

Lets assume x(1x3) and y(1x8)

 Padd=[x,zeros(1,length(y)-length(x))];

[Chameleon17]

OH!!!! Thank you thank you thank you!!!

That's just great! Thank you so much!!!

[Manolis Michailidis]

If it helped please accept the answer