delete element from vector

6.675 views (last 30 days)
Majid Al-Sirafi
Majid Al-Sirafi on 24 Sep 2012
Commented: Emma Fickett on 29 Oct 2022
Hi everyone
how can I delete element from vector .... for example
how can I delete 3 from above vector to be
thank you
Jeffrey Houston
Jeffrey Houston on 4 Jan 2021
Hi Hamna, sorry for the late response, but I'll answer for others anyways. The line of code below will do the trick for what you're asking for.
b = a(3)

Sign in to comment.

Accepted Answer

Daniel Shub
Daniel Shub on 24 Sep 2012
Edited: MathWorks Support Team on 9 Nov 2018
I can think of three ways that are all slightly different
If you want to get rid of all cases where a is exactly equal to 3
b = a(a~=3);
If you want to delete the third element
b = a;
b(3) = [];
or on a single line
b = a([1:2, 4:end]);
Or, as Jan suggests:
a = [2,3,1,5,4]
a(a == 3) = []
Rik on 31 Mar 2021
@Anthony Dave Flags are not for personal bookmarks. Please remove your flag.

Sign in to comment.

More Answers (5)

Jan on 24 Sep 2012
Edited: Jan on 24 Sep 2012
a = [1,2,3,4,5]
a(3) = []
a = [2,3,1,5,4]
a(a == 3) = []
These methods are explained exhaustively in the "Getting Started" chapters of the documentation. It is strongly recommended to read them completely. The forum is not though to explain the fundamental basics. Thanks.
irvin rynning
irvin rynning on 6 Dec 2021
unfortunately some of us prefer to use Matlab to solve problems in a timely manner, and cannot always engage in stackover-flow style plaudits on criticizing one's peers

Sign in to comment.

masoud sistaninejad
masoud sistaninejad on 23 Aug 2021
A = [ 1 2 3 4 5 6 7]
A = 1×7
1 2 3 4 5 6 7
B = [1 3 6]
B = 1×3
1 3 6
C = setdiff(A,B)
C = 1×4
2 4 5 7
Emma Fickett
Emma Fickett on 29 Oct 2022
I've scoured through so many forums trying to remove a vector of values from another vector and setdiff does exactly what I needed, thank you so much!!

Sign in to comment.

Andrei Bobrov
Andrei Bobrov on 24 Sep 2012
a = a(abs(a - 3) > eps(100))
  1 Comment
Majid Al-Sirafi
Majid Al-Sirafi on 24 Sep 2012
than you very much

Sign in to comment.

Will Reeves
Will Reeves on 15 Feb 2022
really crude, but if you wanted to remove a row defined by and index, rather than a value, you could do something like this:
function out=removeRow(in,index)
% removes a row from an matrix
if index>n || index<0
error('index needs to be within the range of the data')
if n==1
out=[]; % you've removed the last entry
% strip out the required entry
if index==1
elseif index==n
out=in([1:index-1 index+1:n]);

Elias Gule
Elias Gule on 1 Dec 2015
% Use logical indexing
a = a(a~=3)
Ntsakisi Kanyana
Ntsakisi Kanyana on 31 Mar 2020
Does it work on strings?

Sign in to comment.


Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!