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delete element from vector

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Hi everyone
how can I delete element from vector .... for example
a=[1,2,3,4,5]
how can I delete 3 from above vector to be
a=[1,2,4,5]
thank you
majid

  7 Comments

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Rosie
Rosie on 5 Jul 2017
Hi majed
You can use the follwoing
a(index)=[]
a(3)=[]
the number will delete
Good luck
Hamna Ameer
Hamna Ameer on 29 Sep 2017
a(3)=[] how can i directly store this in a new vector say b?

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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
a=[1,2,3,4,5];
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) = []

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Walter Roberson
Walter Roberson on 16 Jun 2016
Mustafa Uslu comments,
"Practical, fast and accurate!"
kwabena boafo-mensah
kwabena boafo-mensah on 8 Jul 2016
how does this work when i need to delete a range of row elements from a vector
Walter Roberson
Walter Roberson on 5 Jul 2017
b = a(a >= 2 & a <= 4); %keep 2 to 4

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More Answers (3)

Jan
Jan on 24 Sep 2012
Edited: Jan on 24 Sep 2012
a = [1,2,3,4,5]
a(3) = []
Or:
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.

  2 Comments

Majid Al-Sirafi
Majid Al-Sirafi on 24 Sep 2012
thank you very much
Joel Bay
Joel Bay on 28 Jun 2019
"These methods are explained exhaustively in the "Getting Started" chapters of the documentation."
Wrong, definetely not exhaustively after comparing Daniel's answer and the documentation. Logical indexing is not even mentioned. The answers to this question is still useful in 2019.

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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

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Elias Gule
Elias Gule on 1 Dec 2015
% Use logical indexing
a = a(a~=3)

  2 Comments

denny
denny on 31 Aug 2017
I like this answer.
Ntsakisi Kanyana
Ntsakisi Kanyana on 31 Mar 2020
Does it work on strings?

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