how to replace all elements with zeros after "ONE" (number) in every column of matrix???

Question

M.Prasanna kumar 2020-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/504347-how-to-replace-all-elements-with-zeros-after-one-number-in-every-column-of-matrix

评论： M.Prasanna kumar 2020-2-16

采纳的回答： per isakson

in each column of 2000*32 matrix there are so many "ONES" i want to replace all elements with zeros after first "ONE".

there might be so many "ONES" IN every column of matrix.

I want to replace after First "ONE" (ONE is number in column of matrix)

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Answer 1

per isakson 2020-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/504347-how-to-replace-all-elements-with-zeros-after-one-number-in-every-column-of-matrix#answer_414478

Try this

>> m = randi([0,1],[6,8])
m =
     0     0     0     1     0     0     0     0
     0     1     1     1     1     1     0     1
     0     0     0     0     1     0     0     0
     0     0     1     0     1     1     0     0
     1     1     1     1     0     1     1     1
     1     1     1     0     0     0     0     0
>> for jj = 1:8, r=find(m(:,jj)==1,1,'first'); m(r+1:6,jj)=0; end
>> m
m =
     0     0     0     1     0     0     0     0
     0     1     1     0     1     1     0     1
     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0
     1     0     0     0     0     0     1     0
     0     0     0     0     0     0     0     0
>>

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M.Prasanna kumar 2020-2-16

thank you very much sir

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Answer 2

Stephen23 2020-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/504347-how-to-replace-all-elements-with-zeros-after-one-number-in-every-column-of-matrix#answer_414490

>> mat = randi([0,1],[6,8])
mat =
 0   0   0   0   1   0   0
 0   0   1   0   0   0   1
 0   1   0   0   0   1   1
 0   0   0   1   0   0   1
 1   1   0   0   0   1   0
 1   0   0   0   0   0   1
>> out = mat .* (cumsum(mmat,1)==1)
out =
 0   0   0   0   1   0   0
 0   0   1   0   0   0   1
 0   1   0   0   0   1   0
 0   0   0   1   0   0   0
 1   0   0   0   0   0   0
 0   0   0   0   0   0   0