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how to change part of a matrix into zero

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napo
napo 2013-12-7
评论： djibeyrou ba 2020-5-21
i have a matrix A= (m,n) and i want to make the first 10% row elements 0 suppose A= [1 1 1; 2 2 2; 3 3 5; 4 4 4; 5 5 1; 6 1 3; 1 6 5; 7 7 1; 4 8 2; 5 0 9] will become B= [0 0 0; 2 2 2; 3 3 5; 4 4 4; 5 5 1; 6 1 3; 1 6 5; 7 7 1; 4 8 2; 5 0 9]

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-12-7
n1=ceil(0.1*size(A,1));
A(1:n1,:)=0

更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2013-12-7
n = round(numel(A)*.1);
B = A';
B(1:n) = 0;
B = B';
  2 个评论
djibeyrou ba
djibeyrou ba 2020-5-21
a=4;
b=3;
A=zeros(a,b);
B=size(A)
if a== b
B=A==-1;
else
B=A==0;
end
disp(B)
I need help with this code i want to change some value in the matrix

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djibeyrou ba
djibeyrou ba 2020-5-21
I need help with this code

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