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how can i combine two vector into one vector by the follwoing pattern ( and not use "For" Loop which take a lot of time , since this vector is a Million of elements ):

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nissim elmaleh
nissim elmaleh 2014-10-7
评论： Andrei Briciu 2020-3-6
example :
a1 [ 1,2,3,4,5,6......]
a2 [ x,y,z,w,v,b,n,....]
a3 = [ 1,x,2,y,3,z,4,w,5,v,.....]
many thanks for the help

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回答（2 个）

Michael Haderlein
Michael Haderlein 2014-10-7
编辑：Michael Haderlein 2014-10-7
One option
a3=[a1; a2];
a3=a3(:)';
This only works if a1, a2 are line vectors. Otherwise, take the transpose of each in the first line.
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sravankumar v
sravankumar v 2017-8-11
can you please tell me how can i arrange the elements of three matrices alternatively in to another matrix using for loop?

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Orion
Orion 2014-10-7
Hi,
the command a3=[a1; a2]; will put the a2 vector at the end of the a1 vector and not alternate the value of a1 and a2.
to make the pattern asked, you should do something like :
a1 = 1:10;
a2 = 21:30;
a3 = zeros(1,length(a1)*2);
a3(1:2:end-1) = a1;
a3(2:2:end) = a2;
this will work very fast even for a million element vector.
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Chris Liu
Chris Liu 2018-11-29
Thanks for the answer. So what's the case if and are matrix? When I do like that,
just change a3 = zeros(1,size(a1,2)*2);
it reports error: "unable to perform assignment because the left and right sides have a different number of elements." Thanks.

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