Symbolic Integration in Matlab

I am just trying to solve an equation in matlab but it does give me a warning. "Warning Explicit integral could not be found" After some search people suggested to wrap my equation with Double() method but even with that I recieve wrong answer( ans=0) which I calculated on mathematica/maple as 4.62240566.

I think its something related with floating point but I am not exactly sure how to fix it

syms t
int( (t^2+100)^(-1/2)*exp(-10^-3*(t^2 + 100)^(1/2)),t , 1, Inf) 
   Warning: Explicit integral could not be found. 

Judging from this http://www.mathworks.nl/help/symbolic/int.html the code you would need is:

int(1/(exp(1000*(t^2 + 100)^(1/2))*(t^2 + 100)^(1/2)), t , 1,Inf)

Or perhaps you can use

t == 1..inf

And wrap it with vpa like in the example, rather than with double.