For anyone who happens to be looking for this feature in the future, let me share a simple workaround: in terms of the built-in function gamma(x), you can write
factorial(x) = gamma(x+1)
So, e.g., gamma(4) = 6. (The gamma function is also defined for non-integer values of x. It is only undefined for negative integers.)
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I, too, would find the factorial function very useful!
David
For anyone who happens to be looking for this feature in the future, let me share a simple workaround: in terms of the built-in function gamma(x), you can write
factorial(x) = gamma(x+1)
So, e.g., gamma(4) = 6. (The gamma function is also defined for non-integer values of x. It is only undefined for negative integers.)