MATLAB Answers

6

delete element from vector

Asked by Majid Al-Sirafi on 24 Sep 2012
Latest activity Edited by MathWorks Support Team on 9 Nov 2018
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

a(3) = [];
Hi majed
You can use the follwoing
a(index)=[]
a(3)=[]
the number will delete
Good luck
a(3)=[] how can i directly store this in a new vector say b?

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4 Answers

Answer by Daniel Shub
on 24 Sep 2012
Edited by MathWorks Support Team on 9 Nov 2018
 Accepted Answer

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) = []

  5 Comments

Mustafa Uslu comments,
"Practical, fast and accurate!"
how does this work when i need to delete a range of row elements from a vector
b = a(a >= 2 & a <= 4); %keep 2 to 4

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Answer by Jan
on 24 Sep 2012
Edited by 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.

  1 Comment

thank you very much

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Answer by Andrei Bobrov
on 24 Sep 2012

a = a(abs(a - 3) > eps(100))

  1 Comment

than you very much

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Answer by Elias Gule
on 1 Dec 2015

% Use logical indexing
a = a(a~=3)

  1 Comment

I like this answer.

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