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    %% Specify Parameter Range
% Plot the parametric line
% 
% $$\matrix{x = e^{-t/10} \sin(5t) \cr y = e^{-t/10} \cos(5t) \cr z = t}$$
% 
% over the parameter range |[-10 10]| by specifying the fourth input
% argument of |fplot3|.

xt = @(t) exp(-t/10).*sin(5*t);
yt = @(t) exp(-t/10).*cos(5*t);
zt = @(t) t;
fplot3(xt,yt,zt,[-10 10])