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Article #85

Re: Combining vectors

#85
From: Weizheng Wang
Date: Wed, 27 Jan 1993 14:47
46 lines
1864 bytes
In article <1k5hf2INNlgs@shelley.u.washington.edu> phantom@stein2.u.washington.edu (The Phantom) writes:
>In article <1993Jan26.182616.11550@vax.oxford.ac.uk> reese@vax.oxford.ac.uk writes:
>>
>>
>>I want to take two vectors and combine them, e.g.
>>[ a b c d e]  and [ f g h i j ] 
>>become  [ a f b g c h d i e j ]
>>
>
>say a=[ a b c d e ] and b=[ f g h i j ] -- an easy way to do this would be
>using ...
>
>len=length(a);			%assuming length(a), length(b) are equal
>FOR count=1:len,
>	c((count*2)-1)=a(count);
>	c((count*2)=b(count);
>END
>
>that seems to work, anyway. just work with the commands for picking out 
>certain matrix spots and FOR loops, and you should be able to comprise 
>something that works both ways.
>
>mt
>

Try the following:

% assignment of your vector
x = ['a' 'b' 'c' 'd' 'e'];
y = ['f' 'g' 'h' 'i' 'j'];
% assign an index vector
ind = [1:length(x)];
%assign the vector
z(ind*2-1) = x;
z(ind*2) = y;

%reverse assignment
%assign an index in a reverse way:
ind2 = [length(x) : -1 : 1];
%assign the vector
z2(ind*2-1) = x(ind2);
z2(ind*2) = y(ind2);


Actually, the contents of ind and ind2 can be any number in the index range.
I believe the example shows the most efficient and flexible way to use MATLAB.
Technical Details
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From: wang@nyquist.usc.edu (Weizheng Wang)
Newsgroups: comp.soft-sys.matlab
Subject: Re: Combining vectors
Date: 27 Jan 1993 06:47:57 -0800
Organization: University of Southern California, Los Angeles, CA
Lines: 47
Message-ID: <1k67atINNb9p@nyquist.usc.edu>
References: <1993Jan26.182616.11550@vax.oxford.ac.uk> <1k5hf2INNlgs@shelley.u.washington.edu>
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