Return first few values to zero in a row

Question

Hokkien 2021-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/1618940-return-first-few-values-to-zero-in-a-row

回答： Image Analyst 2021-12-29

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!

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Answer 1

Voss 2021-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/1618940-return-first-few-values-to-zero-in-a-row#answer_863975

在 MATLAB Online 中打开

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