difference results from int and integral of delta function

Hello Matlab experts:

I am trying to calculate the integral of delta function, however I got two different answers. apparently answer 0 is wrong. Can anyone explain the difference for me?

really appreciate.

Regards

Method 1:

>> int(dirac(x), -inf, inf)

ans =

1

Method 2:

>> delta_fun = @(t) dirac(t);

>> integral(delta_fun, -inf, inf)

ans =

0

>> delta_fun(0)

ans =

Inf

[David Hill]

In method 2 you are trying to do numeric integration on a symbolic function.