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

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)

Answer 1

[per isakson]

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
>>

[M.Prasanna kumar]

thank you very much sir

Answer 2

[Stephen23]

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

[M.Prasanna kumar]

thank you very much sir