Systematically add entries to vector array

2017 8 22
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更新时间：2017 8 22
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Hi,
Given I have a vector as for instance: [ 1 3 5 7 1 3 ...]
I want to add twice the number "8" after each entry, hence we would have:
[ 1 8 8 3 8 8 5 8 8 7 8 8 1 8 8 3 8 8 ...]
How could I do that, in a way which would be not specific for the length of my initial array? Thanks

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Stephen23
Stephen23 2017-8-22
编辑：Stephen23 2017-8-22

1 个投票

Here is one efficient method, without creating any temporary variables:
>> V = [1 3 5 7 1 3];
>> V(2:3,:) = 8;
>> V(:).'
ans =
1 8 8 3 8 8 5 8 8 7 8 8 1 8 8 3 8 8

更多回答（1 个）

KSSV
KSSV 2017-8-22

0 个投票

A = [ 1 3 5 7 1 3] ;
N = (length(A))*2+length(A) ;
C = 8*ones(N,1) ;
C(1:3:end) = A ;

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