selecting particular rows in a matrix

Question

Naga A 2015-10-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248283-selecting-particular-rows-in-a-matrix

评论： Star Strider 2015-10-13

采纳的回答： Star Strider

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Hi , I know this is very simple, I have a matrix looks like

A =

I need to select the rows which contains only one 1's like the rows 1,2,4. next i need to select the rows which contains two ones like the rows 3,5,6.I'm using the function find to check the indexes containing one as follows:

for i=1:length(A)
b=find(A(i,:)==1);
c(i)=length(b);
end

Is there any possible solution instead of using the for loop, because I need to use this code for the similar matrix contains 120 columns? Thanks for the help.

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Answer 1

Star Strider 2015-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/248283-selecting-particular-rows-in-a-matrix#answer_195768

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This works:

A = [0     0     1
     0     1     0
     0     1     1
     1     0     0
     1     0     1
     1     1     0
     1     1     1];
   Rows_1 = find(sum(A,2)==1)             % Rows with 1 ‘1’
   Rows_2 = find(sum(A,2)==2)             % Rows with 2 ‘1’s
   Rows_3 = find(sum(A,2)==3)             % Rows with 3 ‘1’s