Modifying odd/even numbers of a column vector
29 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
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.
0 commentaires
Réponse acceptée
Rik
le 24 Fév 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);
Plus de réponses (1)
Hernia Baby
le 24 Fév 2021
Modifié(e) : Hernia Baby
le 24 Fév 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 commentaires
Rik
le 24 Fév 2021
Note that you made a small typo: you should have used == to compare the output of mod to 1 or 0.
Hernia Baby
le 24 Fév 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);
Voir également
Catégories
En savoir plus sur Variables dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!