# Return first few values to zero in a row

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Hokkien on 28 Dec 2021
Answered: Image Analyst on 29 Dec 2021
Hi I would like to change only the first few values in a row to zero?
For example I have matrix A=[1 2 4 5 6 7 8 9 0 2 3 4 5 6]
If I want to make the first column until ninth column to be zero, the the new matrix B will be: B=[0 0 0 0 0 0 0 0 0 2 3 4 5 6].
If I want to make the first column until fourth column to be zero, the the new matrix B will be: B=[0 0 0 0 6 7 8 9 0 2 3 4 5 6].
I was thinking something like: A(1,:)=zeros(1,4) but it won't change to zero.
Thank you!

Voss on 28 Dec 2021
A=[1 2 4 5 6 7 8 9 0 2 3 4 5 6]
A = 1×14
1 2 4 5 6 7 8 9 0 2 3 4 5 6
B1 = A;
B1(1:9) = 0
B1 = 1×14
0 0 0 0 0 0 0 0 0 2 3 4 5 6
B2 = A;
B2(1:4) = 0
B2 = 1×14
0 0 0 0 6 7 8 9 0 2 3 4 5 6
Hokkien on 28 Dec 2021
Thank you so much!

Image Analyst on 29 Dec 2021
@Hokkien you might want to review the short training to go over these basic indexing rules:

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