I am receiving an Error using plot

2025 2 24
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更新时间：2025 2 24
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I am getting this error when running my code
Error using plot
Data must be numeric, datetime, duration, categorical, or an array convertible to double.
Error in pendulun (line 27)
plot(t,y1, t,y2)
m1 = 49/1000;
m2 = 31/1000;
l1 = 0.5;
l2 = 0.5;
M = 1; % mlower/ m upper
l = 100/100; %lu/ l lower
A = (-9.8/1.0)*[(-(l + M*l +M)) M ; 1 -1]; % g/ l lower
w = eig(A);
[Aa,Bb] = eig(A);
omg = sqrt(w);
fre = omg/(2*pi);
nA = 1* A;
%nA = [2 -1; -1 2];
wn = eig(nA);
[S, V]= eig(nA);
syms x(t)
coslam = [(cos(sqrt(V(1,1))*t)) 0 ; 0 (cos(sqrt(V(2,2))*t))];
sinlam = [(sin(sqrt(V(1,1))*t)) 0 ; 0 (sin(sqrt(V(2,2))*t))];
Solu = (S*coslam*(inv(S))*[1/100 ;1/100]) + (S* sinlam* (sqrtm(inv(V)))*(inv(S))*[0;0]);
hold on
t = linspace (0,10,1000000);
y1 = Solu(1);
y2 = Solu(2);
plot(t,y1, t,y2)
title (['Plot of y_{1}(t) and y_{2}(t) of the pendulum' ...
' l2 = 1m, M =0.6327, L= 1'])
grid
xlabel ('Time (s)')
ylabel('Distance(m)')
legend('y1(t)','y2(t)')

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Star Strider
Star Strider 2025-2-24
Ran in:

0 个投票

Ran in:
Use the matlabFunction function, evaluate it with ‘t’ and then plot —
m1 = 49/1000;
m2 = 31/1000;
l1 = 0.5;
l2 = 0.5;
M = 1; % mlower/ m upper
l = 100/100; %lu/ l lower
A = (-9.8/1.0)*[(-(l + M*l +M)) M ; 1 -1]; % g/ l lower
w = eig(A);
[Aa,Bb] = eig(A);
omg = sqrt(w);
fre = omg/(2*pi);
nA = 1* A;
%nA = [2 -1; -1 2];
wn = eig(nA);
[S, V]= eig(nA);
syms x(t)
coslam = [(cos(sqrt(V(1,1))*t)) 0 ; 0 (cos(sqrt(V(2,2))*t))];
sinlam = [(sin(sqrt(V(1,1))*t)) 0 ; 0 (sin(sqrt(V(2,2))*t))];
Solu = (S*coslam*(inv(S))*[1/100 ;1/100]) + (S* sinlam* (sqrtm(inv(V)))*(inv(S))*[0;0]);
Solufcn = matlabFunction(Solu)
Solufcn = function_handle with value:
@(t)[cos(t.*5.7844008256047).*5.0e-3+cos(t.*2.395977272167595).*4.999999999999999e-3;cos(t.*5.7844008256047).*(-2.071067811865475e-3)+cos(t.*2.395977272167595).*1.207106781186547e-2]
hold on
t = linspace (0,10,1000000);
Solv = Solufcn(t)
Solv = 2×1000000
0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100 0.0100
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
y1 = Solv(1,:);
y2 = Solv(2,:);
plot(t,y1, t,y2)
title (['Plot of y_{1}(t) and y_{2}(t) of the pendulum' ...
' l2 = 1m, M =0.6327, L= 1'])
grid
xlabel ('Time (s)')
ylabel('Distance(m)')
legend('y1(t)','y2(t)')
●
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