i have errors in variation of y for plotting

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Christella Bañaga 2021-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/1572583-i-have-errors-in-variation-of-y-for-plotting

评论： Christella Bañaga 2021-10-27

so heres my code

and the problem i keep getting

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Christella Bañaga 2021-10-27

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%A 30-volt electromotive force is applied to an LR - series circuit in which the inductance is 0.1 henry and the resistance is 50 ohm.
%Find the current i(t) if i(0)=2.  Determine the current as t approach infinity.
%Setup the variables I(t) as the function of Current over a period of time t,  
%Find also the derivative of I(t) and set as dI
syms I(t);
dI=diff(I,t);
%Initial Conditions
cond1 = I(0) == 2
L = 0.1 %Inductance
R = 50 %Resistance
E = 30 %Voltage
%Set the differential equation model as eqn1;
eqn1 = L*dI + R*I == E;
subs(eqn1, I(t))
%Solve for Isoln as the equation of current at any time t. 
Isoln = dsolve(eqn1 , cond1) 
%Set I steady as the current at t approach infinity.
Isteady = limit(Isoln , inf)
%Set the final time as the 5L/R
tfinal = 5*L/R;
% Plot the equation: Use the Title=Current in RL Circuit, XValue=Time (in Sec), YValue=Current (Amps)
Title = "Current in RL Circuit";
XValue = "Time (in Sec)";
YValue = "Current (Amps)";
%Use the domain (0, tfinal) with 100 points 
x=linspace(0,tfinal);
t=linspace(100,100);
y= Isoln;
plot(x,t);
hold on;
grid on;
title(Title)
xlabel(XValue),ylabel(YValue);