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Add SINGLE element to array or vector

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I have a vector of the format:
x = [xval(1) xval(2) … xval(n)]
, and I want to add an element to the end, xval(n+1). How do I do that?

Accepted Answer

Image Analyst
Image Analyst on 12 May 2016
Edited: Image Analyst on 18 Oct 2020
For an existing vector x, you can assign a new element to the end using direct indexing. For example
x = [1 2 3]
x(4) = 4
or
x(end+1) = 4;
where "end" is a special keyword in MATLAB that means the last index in the array. So in your specific case of n elements, it would automatically know that "end" is your "n".
Another way to add an element to a row vector “x” is by using concatenation:
x = [x newval]
or
x = [x, newval]
For a column vector:
x = [x; newval]
  6 Comments
Stefano Cardarelli
Stefano Cardarelli on 26 Mar 2020
also this works for me, is basically direct indexing:
x(end+1) = newval

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More Answers (3)

Dakota Jandek
Dakota Jandek on 7 Apr 2020
x = [1, 2, 3]
x(length(x)+1) = 4
  2 Comments
Image Analyst
Image Analyst on 18 Oct 2020
Or even better,
x = [1, 2, 3]
x(end+1) = 4

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Tue Dao
Tue Dao on 20 Dec 2020
Which option is equivalent to the expression below:
a|b & c|~d
  1 Comment
Image Analyst
Image Analyst on 20 Dec 2020
I think you "Answered" this 4 year old question when you actually meant to post a NEW question of your own.

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