Why is this assignment displaying an error?

Question

Robert Flores 2018-4-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/397348-why-is-this-assignment-displaying-an-error

回答： Star Strider 2018-4-25

采纳的回答： Star Strider

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Hello,

I am wondering why I am getting this display error. I have written another script using the same matrix, it's just a smaller square matrix. Can anyone help me in having this script run correctly. In the attachments is a snip picture of what I am seeing in the command window.

%%If 10 elements are used 
E = 30*10^6; 
L_0 = 6;
F = 300;
SLOPE = -1/12;
D = @(x) (SLOPE*x)+1;     % This is the function of Diameter 
A = @(x) (pi/4)*(D(x)^2);   % This is the function of Area 
L_10 = L_0/10;
k1 = (A(L_10)*E)/L_10;
k2 = (A(2*L_10)*E)/L_10;
k3 = (A(3*L_10)*E)/L_10;
k4 = (A(4*L_10)*E)/L_10;
k5 = (A(5*L_10)*E)/L_10;
k6 = (A(6*L_10)*E)/L_10;
k7 = (A(7*L_10)*E)/L_10;
 % This is the Global Stiffness Matrix
  K = [k1, -k1, 0, 0, 0, 0, 0, 0, 0, 0, 0; 
      -k1, k1+k2, -k2, 0, 0, 0, 0, 0, 0, 0, 0;       
      0, -k2, k2+k3, -k3, 0, 0, 0, 0, 0, 0, 0;
      0, 0, -k3, k3+k4, -k4, 0, 0, 0, 0, 0, 0;
      0, 0, 0, -k4, k4+k5, -k5, 0, 0, 0, 0, 0;
      0, 0, 0, 0, -k5, k5+k6, -k6, 0, 0, 0, 0;
      0, 0, 0, 0, 0, -k6, k6+k7, -k7, 0, 0, 0;
      0, 0, 0, 0, 0, 0, -k7, k7+k8, -k8, 0, 0;
      0, 0, 0, 0, 0, 0, 0, -k8, k8+k9, -k9, 0;
      0, 0, 0, 0, 0, 0, 0, 0, -k9, k9+k10, -k10;
      0, 0, 0, 0, 0, 0, 0, 0, 0, -k10, k10;
% This is the Global Stiffness Matrix
Stiffness = [ k1+k2, -k2, 0, 0, 0, 0, 0, 0, 0, 0;       
    -k2, k2+k3, -k3, 0, 0, 0, 0, 0, 0, 0;
    0, -k3, k3+k4, -k4, 0, 0, 0, 0, 0, 0;
    0, 0, -k4, k4+k5, -k5, 0, 0, 0, 0, 0;
    0, 0, 0, -k5, k5+k6, -k6, 0, 0, 0, 0;
    0, 0, 0, 0, -k6, k6+k7, -k7, 0, 0, 0;
    0, 0, 0, 0, 0, -k7, k7+k8, -k8, 0, 0;
    0, 0, 0, 0, 0, 0, -k8, k8+k9, -k9, 0;
    0, 0, 0, 0, 0, 0, 0, -k9, k9+k10, -k10;
    0, 0, 0, 0, 0, 0, 0, 0, -k10, k10;
F = [0;0;0;0;0;0;0;0;0;300];
U = inv(K2)*F