delete elements from the given array

2020 12 1
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更新时间：2020 12 1
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for example. an array X is given, which is X=[1,2,3,4,5,6] how to delete all even numbers of this array except the last even number(6)? In other words, how to make this array look like X=[1,3,5,6]?

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Ameer Hamza
Ameer Hamza 2020-12-1

0 个投票

Try this
X=[1,2,3,4,5,6];
idx = find(mod(X,2)==0);
X(idx(1:end-1)) = []

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Oksi Moon
Oksi Moon 2020-12-1
Thank you very much!
Stephan
Stephan 2020-12-1
X=[1,2,3,4,5,6,7]
idx = find(mod(X,2)==0);
X(idx(1:end-1)) = []
results in:
X =
1 2 3 4 5 6 7
X =
1 3 5 6 7
you stated:
"...what if I have 7 elements [1,2,3,4,5,6,7] and I still need to get [1,3,5,6]. i need to leave the last even number. not just the last number"

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Stephan
Stephan 2020-12-1

0 个投票

X(2:2:end-1) = []

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Oksi Moon
Oksi Moon 2020-12-1
thank you! what if I have 7 elements [1,2,3,4,5,6,7] and I still need to get [1,3,5,6]. i need to leave the last even number. not just the last number
Stephan
Stephan 2020-12-1
编辑：Stephan 2020-12-1
X=[1,2,3,4,5,6,7]
idx = find(mod(X,2)==0,1,'last');
X(idx+1:end) = [];
X(2:2:idx-1) = []
gives:
X =
1 2 3 4 5 6 7
X =
1 3 5 6

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