Array value replace when change in row

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Vivek Shukla 2020-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/617258-array-value-replace-when-change-in-row

评论： Vivek Shukla 2020-10-19

采纳的回答： Matt J

I have one row of matrix

A = [ 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ; 1 ]

the row has only two value 0 and 1. I want the code that will check the row if vaule change in row it will leave the first value change and aftre that it puts 0.

Output ::

A = [ 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 1 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ; 0 ]

Here you can see value of row is change at (13,1) position so it leave the first 1 and remaing 1 is replaced by 0.

Note::: this is example actual row size is 1508 x 1.

Can some one please help me thank you.

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采纳的回答

Matt J 2020-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/617258-array-value-replace-when-change-in-row#answer_516793

编辑：Matt J 2020-10-18

在 MATLAB Online 中打开

A=randi([0,1],7,10); %Example
[m,n]=size(A);
[~,idx]=max(A,[],1);
out  = sparse(idx,1:n,1,m,n) ; 
A,
A = 7×10
     1     0     0     1     1     0     0     0     0     0
     0     1     1     0     1     0     1     0     1     1
     1     1     1     0     1     0     1     1     0     1
     0     0     1     1     0     0     0     0     1     1
     1     1     1     1     0     1     0     0     1     0
     0     0     1     1     1     0     1     1     0     0
     1     1     1     0     0     1     1     0     1     1
●
full(out)
ans = 7×10
     1     0     0     1     1     0     0     0     0     0
     0     1     1     0     0     0     1     0     1     1
     0     0     0     0     0     0     0     1     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     1     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0