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n= 3*100 matrix
i want to select 20 non repeating random column
so, final matrix will be
x=3*20 ;
where 3 rows should be the corresponding column value of the original matrix
Any help would be really appreciated.
Thanks

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Md Nazmul Hoque
Md Nazmul Hoque 2022-6-5
sorry for that bro, i'm kinda new.
i wanted the specific solution.
in the last one , i thought i couldn't explain it properly
thats why. anyway thank you for your support.

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