Trying to Calculate Node Displacement for a Truss using matrix

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Joseph
Joseph 2015-7-7
I am trying to calculate the node displacement of a Truss but my code is returning error. 'Unexpected matlab Function' in me for loop. Can Someone help me understand why my code is not working? Thank You
% Nodal Displacement
area = 7550 % mm^2
E = 69 % GPa
w = 4 % m
h = 3 % m
K = [1 0 -1 0; 0 0 0 0 ; -1 0 1 0; 0 0 0 0];
J_C = [0 0 ; w 0; w h; 2*w 0;2*w 2*h; 3*w 0; 3*w 3*h; 4*w 0;4*w 2*h; 5*w 0; 5*w h; 6*w 0];
BarC = [1 2; 2 3; 1 3;2 4;3 4; 4 5; 4 6; 5 6; 5 7; 6 7; 6 8; 6 9; 7 9;8 9; 8 10; 8 11; 9 11;10 11; 10 12; 11 12];
for iEL = 1:nEL
idBeg = BarC(iEL, 1);
idEnd = BarC(iEL, 2);
dx = J_C(idEnd,1) - J_C(idBeg, 1);
dy = J_C(idEnd,2) - J_C(idBeg, 2);
L = sqrt(dx*dx + dy*dy);
c = dx/L
s = dy/L
K(2*idBeg - 1,2*idBeg - 1) = c^2;
K(2*idBeg, 2*idBeg) = s^2;
K(2*idEnd - 1,2*idEnd - 1) = c^2;
K(2*idEnd, 2*idEnd) = s^2;
K(2*idEnd - 1,2*idBeg - 1) = c^2;

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