i want to have a signal with variable frequency but i don't know how to do that. the code is
A=240;
d=6;
C=55*pi;
x=[0:1/100:10];
s=x.^3;
a=-(s.*d);
c=x.*C;
b=cos(c);
t=b.*(x.*(A*exp(a))); %the signal
varuable frequency
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