Modifying odd/even numbers of a column vector
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How would I go about modifying the odd and even elements of the following vector ?
x = [4 5 7 6 5 8 2 1];
So that when run it can carry out either +,-,*,/,^ ?.
Also after the vectors have been changed the disp(x); shows all all elements, including ones not changed.
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Accepted Answer
Rik
on 24 Feb 2021
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks).
x = [4 5 7 6 5 8 2 1];
%with simple indexing:
x(1:2:end)=2*x(1:2:end);
disp(x);
%or with logical indexing with mod:
L=mod(x,2)==0;
x(L)=2*x(L);
disp(x);
More Answers (1)
Hernia Baby
on 24 Feb 2021
Edited: Hernia Baby
on 24 Feb 2021
You can modyfiy each element with mod function.
x = [4 5 7 6 5 8 2 1];
x_odd = x(mod(x,2)==1); % odd element
x_even = x(mod(x,2)==0); % even element
mod
3 Comments
Rik
on 24 Feb 2021
Note that you made a small typo: you should have used == to compare the output of mod to 1 or 0.
Hernia Baby
on 24 Feb 2021
Thank you, Rik! I will modify my typo.
--------------------------------
To Matt
I got what you want to do.
Then, you can do this with logical indexing.
It is same with Rik's code.
times = 2;
x = [4 5 7 6 5 8 2 1];
idx_odd = mod(x,2) == 1; % odd element
x(idx_odd) = times * x(idx_odd);
disp(x);
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