Add SINGLE element to array or vector
显示 更早的评论
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?
1 个评论
Image Analyst
2022-5-27
@Anushalini Thiyagarajan I have no idea what you mean. Please ask your question in a new question (not here) after you read this:
In the meantime, look at input functions such as readmatrix, importdata, dlmread, xlsread, fgetl, etc.
采纳的回答
Image Analyst
2016-5-12
编辑：Image Analyst
2020-10-18
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 个评论
Weird Rando
2016-5-12
编辑：Weird Rando
2016-5-12
Also, you need to initialise the variable x before your for loop.
x = [];
And inside the for loop you use Image Analyst code.
Pedro GUillem
2016-5-12
Brent Vaalburg
2018-12-2
How would you add a delimeter to this?
Image Analyst
2018-12-2
Please state exactly what you'd like as an output. It sounds like you want a string (character array).
Mathi
2019-11-5
The above code is working perfectly. Thank you.
Stefano Cardarelli
2020-3-26
编辑：Stefano Cardarelli
2020-3-26
also this works for me, is basically direct indexing:
x(end+1) = newval
更多回答（2 个）
Dakota Jandek
2020-4-7
2 个投票
x = [1, 2, 3]
x(length(x)+1) = 4
2 个评论
Adrien Bouguerra
2020-10-18
amazing method , really efficient thank u so much Dakota
Image Analyst
2020-10-18
Or even better,
x = [1, 2, 3]
x(end+1) = 4
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