Defining a constant in Mathematica

ToxicBug · Mar 24, 2009

Hello, I've been breaking my head over this for a couple hours now.

I'm trying to find the expected value of a Gumbel distribution.

Code:

Integrate[ y*E^(-((y - a)/b))*E^(-E^(-((y - a)/b)))/b, {y, -Infinity, Infinity},
  Assumptions -> b > 0]

If I set a = 2 and b = 5, it works. Otherwise it gives me a very complicated expression. I've tried SetAttributes[a, Constant], but it doesn't do the trick. Anyone know how can I solve this?

CompuChip · Mar 24, 2009

Try giving it some information about a, like

Code:

Assumptions -> b > 0 && Element[a, Reals]

Defining a constant in Mathematica

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Defining a constant in Mathematica

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