I need to perform element by element subtractions within a matrix.
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a 21x2 matrix for a given row say row 12, I need to calculate the errors by using the following numerical schemes; backwards - ((y(12)-y(11)/x(12)-x(11)), forwards - (y(13)-y(12))/(x(13)-x(12), and central (y(13)-y(11))/(x(12)-x(11)). My program needs to use matrix based calculations to solve for each element of the matrix. The following code works for the forward but I cant get the backwards or central working.
yn1 =y(2:length(y));
yn = y(1:length(y)-1);
xn1 =x(2:length(x));
xn = x(1:length(x)-1);
Thanks for the help
2 commentaires
Réponses (1)
Image Analyst
le 27 Sep 2022
Modifié(e) : Image Analyst
le 27 Sep 2022
5 commentaires
Steven Lord
le 28 Sep 2022
Modifié(e) : Steven Lord
le 28 Sep 2022
It's one of the building blocks you need.
x = (1:5).^2
y = diff(x)
check = [y(3), x(4)-x(3)] % should match
Read carefully through the diff documentation page, paying specific attention to the "Approximate Derivatives with diff" example and the description of the dim input argument.
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements 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!