delete element from vector

조회 수: 6,232(최근 30일)
Majid Al-Sirafi
Majid Al-Sirafi 2012년 9월 24일
댓글: Emma Fickett 2022년 10월 29일
Hi everyone
how can I delete element from vector .... for example
how can I delete 3 from above vector to be
thank you
  댓글 수: 8
Jeffrey Houston
Jeffrey Houston 2021년 1월 4일
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)

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채택된 답변

Daniel Shub
Daniel Shub 2012년 9월 24일
편집: MathWorks Support Team 2018년 11월 9일
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) = []
  댓글 수: 7
Rik 2021년 3월 31일
@Anthony Dave Flags are not for personal bookmarks. Please remove your flag.

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추가 답변(5개)

Jan 2012년 9월 24일
편집: Jan 2012년 9월 24일
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.
  댓글 수: 3
irvin rynning
irvin rynning 2021년 12월 6일
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

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masoud sistaninejad
masoud sistaninejad 2021년 8월 23일
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
  댓글 수: 2
Emma Fickett
Emma Fickett 2022년 10월 29일
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!!

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Andrei Bobrov
Andrei Bobrov 2012년 9월 24일
a = a(abs(a - 3) > eps(100))
  댓글 수: 1
Majid Al-Sirafi
Majid Al-Sirafi 2012년 9월 24일
than you very much

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Will Reeves
Will Reeves 2022년 2월 15일
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 2015년 12월 1일
% Use logical indexing
a = a(a~=3)
  댓글 수: 2
Ntsakisi Kanyana
Ntsakisi Kanyana 2020년 3월 31일
Does it work on strings?

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