How can I remove elements divisible by 3,4, and 5 in a vector?

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Bridgit Nata 2016-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/303938-how-can-i-remove-elements-divisible-by-3-4-and-5-in-a-vector

回答： karim karim 2020-1-10

I've created a vector x = 1:50 but I'm having trouble in how I can remove elements divisible by 3, 4, and 5, and then display it in a new vector. Thank you!

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Answer 1

Sean de Wolski 2016-9-21

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在 MATLAB Online 中打开

x = 1:50;
x([3:3:50,4:4:50,5:5:50]) = []

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Bridgit Nata 2016-9-21

thank you!!

James Tursa 2016-9-21

@Nathalie: Note that this solution deletes the elements whose "indexes" are divisible by 3, 4, 5. In your particular example, since the indexes match up with the values one-for-one, this gives the same solution as below.

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Answer 2

Andrei Bobrov 2016-9-21

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x = (1:50)';
out = x(all(bsxfun(@rem,x,3:5),2));

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Bridgit Nata 2016-9-21

thank you!!

James Tursa 2016-9-21

@Nathalie: Note that this solution deletes the elements whose "values" are divisible by 3, 4, 5. In your particular example, since the indexes match up with the values one-for-one, this gives the same solution as above.

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Answer 3

George 2016-9-21

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You can do this using mod().

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Answer 4

karim karim 2020-1-10

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在 MATLAB Online 中打开

This is a general solution :

x=input(' x = ');
i=1;
while i<= length(x)
    if mod(x(i),3)==0 || mod(x(i),4)==0 || mod(x(i),5)==0 
       x(i)=[];
    else i=i+1;
    end
end
disp(x);