Error using quad for nummerical integration

I am unable to understand why i cant use the quad function for nummerical integration..

tk = 1.5;
Assymptotisk=@(x) sqrt(2/pi)*1/sqrt(x)*exp(-x);
vc= quad(Assymptotisk,tk,inf);

The above code reproduces the problem in my main program..

Thanks in advance!

Answer 1

[Pedro Villena]

this equation has a singularity to Inf

tk = 1.5;
Assymptotisk=@(x) sqrt(2/pi).*exp(-x)./sqrt(x);
vc= quad(Assymptotisk,tk,1e18);

[DoVile Last Name:]

You were right, i looked at my problem again and it turns out i was using the wrong function :)

Thanks

[Andrei Bobrov]

quadgk(Assymptotisk,tk,inf);
integral(Assymptotisk,tk,inf);% with MATLAB R2012a