NAN when we integrate

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mutah 2013-12-25

评论： Youssef Khmou 2013-12-27

I have this code

b=1;mu=1;

f = @(t) (t.^(2*mu)).*exp(-t.^2).*besseli(mu-0.5,a.*t.^2)

Q = integral(f,b,Inf)

but give me Q=NAN ??

Youssef Khmou 2013-12-25

hi, i think NaN can be logical answer, plus a is not provided ,

 try :
figure, plot(f(-100:0.1:300))

is the area between f and the ax axis defined ?

mutah 2013-12-26

it's ploted 2 lines

Youssef Khmou 2013-12-27

i tried with a numeric vector, and the returned function contains NaN, so the problem happened before the integration,

 r=f(-100:100);
 isnan(r);

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