Modify element in a matrix, row vector

2017 12 7
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更新时间：2021 9 2
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I have a row vector and I want the value from 0 to 500 be all zero, how do I do this? Thanks you!

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James Tursa
James Tursa 2017-12-7

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rowvector(rowvector>=0 & rowvector<=500) = 0;

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Guillaume
Guillaume 2017-12-7
Note that the fact that it is a row vector or even a vector is completely irrelevant. The same code would apply for a matrix.

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Anh Dao
Anh Dao 2017-12-7

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To be more detail, I have 3 row vector, which is defined y1, y2 and y3. Their dimension is 1*166500, for y1, I want the first value to be zero, for y2, I want the value from 0 to 500 to be zero and for y3, I want the value from 0 to 501 to be zero, how do I do this? Thanks you!

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% Separate the rows for simplicity and to use elsewhere as below
y=[1 2 3;4 5 6;7 8 9]
y1=y(1,:)
y2=y(2,:)
y3=y(3,:)
%Just created the matrices of required dimension for demo. You may also
%extract the required files using row extraction operation
y1=(1:166500)
y2=randi(100,1,166500)
y3=randi(100,1,166500)
% In matlab the first element is 1 unlike in maths; so u can change it
% accordingly
y1(1,1)=0
y2(1,1:500)=0
y3(1,1:501)=0

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