problem with Gauss Hermite ( x and w )

Rui Barradas wrote

real^real is not necessarily real.

The most well known example is (-1)^0.5 = imaginary unit.

Damn, can't believe it! It's a silly mistake!

Now that something wonders me is that when applying the Gaussian Hermit, 

sum w f(x_i)

What happens when f(x_i) does not work?
This has nothing to do with R, I will try read more on the material myself.

Thank you all!

Casper


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