delete element from vector

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Majid Al-Sirafi
Majid Al-Sirafi 2012-9-24
评论: Emma Fickett ,2022-10-29
Hi everyone
how can I delete element from vector .... for example
how can I delete 3 from above vector to be
thank you
  7 个评论
Hamna Ameer
Hamna Ameer 2017-9-29
编辑:Hamna Ameer 2017-9-29
a(3)=[] how can i directly store this in a new vector say b?



Daniel Shub
Daniel Shub 2012-9-24
编辑:MathWorks Support Team 2018-11-9
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) = []
  6 个评论
Rik 2021-3-31
@Anthony Dave Flags are not for personal bookmarks. Please remove your flag.


更多回答(5 个)

Jan 2012-9-24
编辑:Jan 2012-9-24
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.
  3 个评论
irvin rynning
irvin rynning 2021-12-6
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


masoud sistaninejad
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
  2 个评论
Emma Fickett
Emma Fickett 2022-10-29
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!!


Andrei Bobrov
Andrei Bobrov 2012-9-24
a = a(abs(a - 3) > eps(100))

Will Reeves
Will Reeves 2022-2-15
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 2015-12-1
% Use logical indexing
a = a(a~=3)

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