Please Help - Explicit integral could not be found

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Kumar V
Kumar V 2012-2-16
t au=(0.2e-9); %fixed value of tau.
syms t; % t is the continous variable i.e TIME
s=(1-4*pi*((t/tau)^2))*exp(-2*pi*((t/tau)^2)); %continous signal, whose normalised autocorrelation is to be found
Eg=int(s^2,t,-inf,inf); % I am getting ENERGY = 7.5e-011
% AUTOCORRELATION HERE "w" is the lag,whose value would be=1e-9 or integer multiple of 1e-9.
% I am calculating in this way
s2=subs(s,t,t+w); % subs is used for substituting t with t+w.
acf=int(s*s2,t,-inf,inf);
%getting error- "Explicit integral could not be found "

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回答（1 个）

Christopher Creutzig
syms w positive
acf = simplify(acf);
ws = 0:1e-9:1e-7;
plot(ws, double(subs(acf, w, ws)));
or, probably better, since the numbers get far too small for double very quickly,
plot(ws, double(log10(subs(acf, w, sym(ws)))))

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