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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?

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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]

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Image Analyst
Image Analyst on 2 Dec 2018
Please state exactly what you'd like as an output. It sounds like you want a string (character array).
Mathi
Mathi on 5 Nov 2019
The above code is working perfectly. Thank you.
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 (2)

Dakota Jandek
Dakota Jandek on 7 Apr 2020
x = [1, 2, 3]
x(length(x)+1) = 4

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Adrien Bouguerra
Adrien Bouguerra on 18 Oct 2020
amazing method , really efficient thank u so much Dakota
Image Analyst
Image Analyst on 18 Oct 2020
Or even better,
x = [1, 2, 3]
x(end+1) = 4

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Youssef AAKAM
Youssef AAKAM on 13 Oct 2019
x=[]
x=[x;'ysf']

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