Index of repeated values

Question

b 2021-12-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1615825-index-of-repeated-values

评论： b 2021-12-22

For the binary vectors of the following type:

ad=[1 1 1 1 0 0 1 1 1 1]
ad=[0 0 1 1 1 1 0 0 1 1]
ad=[0 1 0 1 1 1 1 1 0 0]
ad=[1 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0]

suppose we are interested in finding the index values of the ad vector with consecutive 1s (or 0s). Without using mex, how can we obtain the following output:

For the first case,

output1=[1 2 3 4]; output2=[7 8 9 10];

For the second case,

output1=[3 4 5 6]; output2=[9 10];

For the third case,

output=[4 5 6 7 8];

For the fourth case,

output1=[5 6 7]; output2=[12 13 14];

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2021-12-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1615825-index-of-repeated-values#answer_859970

在 MATLAB Online 中打开

ad=[1 0 0 0 1 1 1 0 0 0 0 1 1 1 0 0] ;
ad0 = zeros(size(ad)) ;
ad0(logical(ad)) = find(ad) ;
ii = zeros(size(ad0));
jj = ad0 > 0;
ii(strfind([0,jj(:)'],[0 1])) = 1;
idx = cumsum(ii).*jj;
out = accumarray( idx(jj)',ad0(jj)',[],@(x){x'});
celldisp(out)
 
out{1} =
 
     1

out{2} =
 
     5     6     7

out{3} =
 
    12    13    14