Problem with construction (1-x)^(1-y) (PR#2103)

(1-x)^0.5

[1] NaN

(1-x)

[1] -4

-4^.5

[1] -2

As Uwe mentioned, you can't take square roots of negative real
numbers, you need to force them to complex first.

The reason it worked in the last example is that exponentiation has
higher precedence than unary negation, so "-4^.5" is evaluated as
"-(4^.5)".

Duncan Murdoch

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