Index Match - distribute a set of data to a larger set

Question

Maneesh 2018-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/408890-index-match-distribute-a-set-of-data-to-a-larger-set

评论： Maneesh 2018-7-6

Hi I have the following 2 arrays A = [9 9 9 10 10 10 11 12 12 12 12 13 14 14 14 15 15 16 16 16 16 17]' B = [10 13 16; 999 900 950]' I am looking for a result set C = [9 9 9 10 10 10 11 12 12 12 12 13 14 14 14 15 15 16 16 16 16 17;0 0 0 999 999 999 0 0 0 0 0 900 0 0 0 0 0 950 950 950 950 0]' I have achieved it using loop and repelem, but i am sure there's got to be a simpler solution. Thanks

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Answer 1

KSSV 2018-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/408890-index-match-distribute-a-set-of-data-to-a-larger-set#answer_327571

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A = [9 9 9 10 10 10 11 12 12 12 12 13 14 14 14 15 15 16 16 16 16 17]' ;
 B = [10 13 16; 999 900 950]' ;
 C = [9 9 9 10 10 10 11 12 12 12 12 13 14 14 14 15 15 16 16 16 16 17;0 0 0 999 999 999 0 0 0 0 0 900 0 0 0 0 0 950 950 950 950 0]'  ;
   iwant = zeros(length(A),2) ;
   iwant(:,1) = A ;
[c,ia] = ismember(A,B(:,1)) ;
for i = 1:max(ia)
    iwant(ia==i,2) = B(i,2) ;
end