🚀 go-pugleaf

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


One of the advantages of matlab is the vector subscripts (do loops are
not very efficient, and can normally be avioded), a better approach
is:-

(again assuming that the vectors are the same length, and called a and
b)

c([1:2:2*length(a),2:2:2*length(a)])=[a,b];

A more general solution for vectors of different lengths is:-

i=length(a);j=length(b);
if i>j
 c([1:2:2*j,j+[j+1:i],2:2:(2*j)])=[a,b];
else
 c([1:2:2*i,2:2:(2*i),i+[i+1:j]])=[a,b];
end  

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