# Matrix dimensions must agree.

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Hamid on 17 Aug 2014
Edited: Hamid on 17 Aug 2014
??? Error using ==> plus
Matrix dimensions must agree.
Error in ==> assem at 28
K(t(i,:),t(i,:)) = K(t(i,:),t(i,:))+Ke;
Dear all, What the hell is this? what should I do? please help me out.
thanks
function [Ke]=bar3e(ex,ey,ez,ep)
%--------------------------------------------------------------------
E=ep(1); A=ep(2);
b=[ ex(2)-ex(1); ey(2)-ey(1); ez(2)-ez(1) ];
L=sqrt(b'*b);
Kle=E*A/L*[1 -1;
-1 1];
n=b'/L; G=[ n zeros(size(n));
zeros(size(n)) n ];
Ke=G'*Kle*G;
%--------------------------end--------------------------------
function [K,f]=assem(edof,K,Ke,f,fe)
%-------------------------------------------------------------
[nie,n]=size(edof);
t=edof(:,2:n);
for i = 1:nie
K(t(i,:),t(i,:)) = K(t(i,:),t(i,:))+Ke;
if nargin==5
f(t(i,:))=f(t(i,:))+fe;
end
end
%--------------------------end--------------------------------
##### 5 CommentsShow 4 older commentsHide 4 older comments
Hamid on 17 Aug 2014
Edited: Hamid on 17 Aug 2014
size(K(t(i,:),t(i,:))) = 4 * 4
on the other hand I want
(K(t(i,:),t(i,:))) size
change to 6*6 but it seems K is 9*9 matrix!!!!
What should I do?
Thanks guys.

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### Answers (1)

Rick Rosson on 17 Aug 2014
doc dbstop
doc dbcont
doc dbquit
doc dbstep
##### 1 CommentShow NoneHide None
Hamid on 17 Aug 2014
size(K(t(i,:),t(i,:))) = 4 * 4
on the other hand I want
(K(t(i,:),t(i,:))) size
change to 6*6 but it seems K is 9*9 matrix!!!!
What should I do?
Thanks guys.

Sign in to comment.

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