Storing matrices upon each for loop iteration

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Brandon
Brandon on 24 Apr 2014
Commented: Brandon on 24 Apr 2014
Here is my problematic for loop. Everything works fine within the loop except for the k matrix being created. What I want to do is store a new matrix each time a new iteration is done in the for loop. With the vectors I could just use (i,1) and the next value gets stored in the following rows.
Is there some way of doing something similar to this with a 4x4 matrix?
for i = 1:n_e
Xcm = Xc(Sn(i,1),1);
Xcn = Xc(En(i,1),1);
Ycm = Yc(Sn(i,1),1);
Ycn = Yc(En(i,1),1);
L(i,1) = sqrt((Xcn-Xcm)^2+(Ycn-Ycm)^2);
l(i,1) = (Xcn-Xcm)/L(i,1);
m(i,1) = (Ycn-Ycm)/L(i,1);
AEL(i,1) = A(i,1)*E(i,1)/L(i,1);
k = AEL(i,:)*[l(i,1)^2, l(i,1)*m(i,1), -l(i,1)^2, -l(i,1)*m(i,1); m(i,1)^2]; ...
dof(i,:) = [Gdof(2*Sn(i)-1), Gdof(2*Sn(i)), Gdof(2*En(i)-1), Gdof(2*En(i))];
i = i+1;
end

Answers (1)

Walter Roberson
Walter Roberson on 24 Apr 2014
  1 Comment
Brandon
Brandon on 24 Apr 2014
Thanks for the basic intro, I'm still having trouble either understanding the concept behind arrays or just not doing it properly. The squiggly brackets {} are new to me and upon using them for k{i} the answer shows up as:
k =
[4x4 double] [4x4 double]
where I should get two 4x4 which seems good, but how can I see what the those 4x4 matrices actually are?

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