for loops not working

2 vues (au cours des 30 derniers jours)
sriram amarnath
sriram amarnath le 24 Juin 2019
Commenté : sriram amarnath le 24 Juin 2019
The below code is to calculate the modes on a plate. The for loops are not using all the values of m & n
% Modes on a plate
Lx=0.286; % length of plate(m)
Lz=0.198; % breadth of plate(m)
for m = 1:1000 % mode numbers
for n = 1:10
func=((n.*pi)./Lx).^2 +((m.*pi)./Lz).^2;% summation function n=1:10 & m= 1:1000
end
end
  2 commentaires
dpb
dpb le 24 Juin 2019
I'm sure the loop runs 10,000 times--only you don't do anything inside the loop except write over the same variable with each computed value in succession so all you get in the end is the very last value.
sriram amarnath
sriram amarnath le 24 Juin 2019
So how do i get a matrix of every value?

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Réponse acceptée

madhan ravi
madhan ravi le 24 Juin 2019
Modifié(e) : madhan ravi le 24 Juin 2019
The same goal can be achieved trivially using meshgrid() or ndgrid() without a loop:
% Modes on a plate
Lx=0.286; % length of plate(m)
Lz=0.198; % breadth of plate(m)
n=10;
m=1000;
[Y,X]= ndgrid(1:m,1:n);
func=(X*pi/Lx).^2 +(Y*pi/Lz).^2;
But the modication in your code is as follows:
func = zeros(1000,10); % before loop
func(m,n) = ... %just add (m,n) next to func inside the loop
  1 commentaire
sriram amarnath
sriram amarnath le 24 Juin 2019
Thanks madhan ravi your a saviour!

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Plus de réponses (1)

dpb
dpb le 24 Juin 2019
"The MATLAB way" is to avoid the loops altogether...
N=10; M=1000;
[X,Y]=meshgrid([1:N],1:M]);
func=(X*pi/Lx).^2 +(Y*pi/Lz).^2;

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