Trouble with For Loop in Differential Equations

2021 4 14
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clear all
%Problem 1a
syms x(t) Fmag;
Dx=diff(x);
k=36;
Fmag=4*cos(4*t);
disp(['dx^2/d^2t +' num2str(k) 'x=' char(Fmag)])
x(t)=simplify(dsolve(diff(x,t,2)+k*x==Fmag,x(0)==0,Dx(0)==4));
dx(t)=diff(x(t));
%Problem 1b
fplot(x(t))
title('Graph of x(t)')
for zeros=dx(t)==0
x(zeros)
end
%Problem 2a
syms w Fmag2;
Fmag2=4*cos(w*t);
disp(['dx^2/d^2t +' num2str(k) 'x=' char(Fmag2)])
x(t)=dsolve(diff(x,t,2)+36*x==Fmag2,x(0)==0,Dx(0)==4);
%Problem 3
%syms x3(t);
c=2;
disp(['dx^2/d^2t +' num2str(c) 'dx/dt +' num2str(k) 'x=' char(Fmag)])
fplot(x(t))
title('Graph of x(t) for Problem 3')

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