Conversion to double from sym is not possible.

2011 10 30
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i want to plot the relation between time&velocity by differentiate displacement , but there is an error
syms x t;
x=2.5*cos(10*pi*t);
vel=diff(x,'t');
i=0;
for t=0:.01:100;
i=i+1;
x(i)=x;
vel(i)=vel;
plot(t,vel)
end
??? Error using ==> plot
Conversion to double from sym is not possible.
can you help me ?

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