MATLAB: Random Matrix to even matrix

evenmatrix

I have a column matrix with numbers a=[0 1 2 3 4 5] and I want to get matrix b=[0 0 2 2 4 4] Basically all the number should be displayed as their closest even number. Please help me with the logic. It is a column matrix ,I am not sure how to show it in the question as it only shows up as a row matrix

The numbers shown is just an example and the numbers on the matrix a could be random as well. but the solution to matrix b should be the nearest even number, that wouldnt change

Best Answer

Manoj, you could use

 a = 0:5;
 b = a - mod(a,2);

Note, your vector is a row vector. Use the prime operator to turn it into a column vector. Also, I believe by closest you mean lower closest, correct? E.g., 1 is right in between 0 and 2.

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use rem to determine which list of numbers is even or odd

X = [1 3 4 2 5 4 2] % hint X is the first column of your matrix
iseven = rem(X,2)==0

use this logical vector to select the whole row of M

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ii=1:3 numel(b);
iwant=zeros(length(ii),1) ;
i=0;
for ii=1:3:numel(b)
 i=i+1;
 iwant(i)= b(ii);
end

Without loop:

iwant=b(1:3;numel(b));

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