how can i substitute number with symbol ?
7 views (last 30 days)
Show older comments
dear all
i have code like below :
clc
clear all
N=4;
L=60e-3;
M=3.338e-3;
jx=5.743e-14;
E=2.1e11;
x = sym('x', [1 3*N], 'real');
for j=2:N+1
for i=j-1
f1(j)=(1-cos(x(3*i-2)))/x(3*i-2);
g1(j)=-(1-cos(x(3*i-1)))/x(3*i-1);
f2(j)=sin(x(3*i-2))/x(3*i-2);
g2(j)=sin(x(3*i-1))/x(3*i-1);
pl(:,j)=L*[f1(j) f2(j)*g1(j) f2(j)*g2(j)]';
Rl(:,:,j)=[cos(x(3*i))*cos(x(3*i-2)) -sin(x(3*i))*cos(x(3*i-2)) sin(x(3*i-2));cos(x(3*i))*sin(x(3*i-2))*sin(x(3*i-1))+sin(x(3*i))*cos(x(3*i-1)) -sin(x(3*i))*sin(x(3*i-2))*sin(x(3*i-1))+cos(x(3*i))*cos(x(3*i-1)) -cos(x(3*i-2))*sin(x(3*i-1));-cos(x(3*i))*sin(x(3*i-2))*cos(x(3*i-1))+sin(x(3*i))*sin(x(3*i-1)) sin(x(3*i))*sin(x(3*i-2))*cos(x(3*i-1))+cos(x(3*i))*sin(x(3*i-1)) cos(x(3*i-2))*cos(x(3*i-1))];
p(:,2)=pl(:,2);
end
end
R(:,:,2)=Rl(:,:,2);
R(:,:,1)=[1 0 0;0 1 0;0 0 1];
for i=3:N+1
R(:,:,i)=R(:,:,i-1)*Rl(:,:,i);
p(:,i)=p(:,i-1)+R(:,:,i-1)*pl(:,i);
end
for j=2:N+1
for i=1:N
for r=1:N
d1Pbeta(:,j,i)=diff(p(:,j),x(3*i-2));
d2Pbetabeta(:,j,i,r)=dot([-M*9.81 0 0],diff(d1Pbeta(:,j,i),x(3*r-2)));
end
end
end
for i=1:N
for r=1:N
for j=2:N+1
sigm(i,r)=(E*jx/L)+sum(d2Pbetabeta(:,j,i,r)');
end
end
end
here i want to replace x with number
x=[0.0495837022782378;3.96268247549320e-09;-4.78044641555791e-10;0.0854433755724521;2.89430795211353e-09;-1.43061297211777e-10;0.110831068380515;4.80530147316531e-09;-5.69420213726607e-10;0.125761304817654;1.09464269988965e-08;-4.73181277688372e-10]
but it doesnt work
and after that calculate eigenvalue of sigm
e=eig(sigm)
0 Comments
Accepted Answer
More Answers (0)
See Also
Categories
Find more on Calculus in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!