Why can't doesn't the following produce a numerical result?
(71) -> eval(integrate(x*exp(-(x-u)^2/2)/(sqrt(2*%pi)),
x=a..%plusInfinity), [a=1,u=0.5])
(71) - 0.25 erf(0.3535533905_932737622) + 0.6020653267_6429947778
Type:
Expression(Float)
(72) -> eval(integrate(x*exp(-(x-u)^2/2)/(sqrt(2*%pi)),
x=a..%plusInfinity), [a=1,u=0.5])::Float
Cannot convert the value from type Expression(Float) to Float .
If I type the expression in manually, it works:
(72) -> -0.25*erf(0.3535533905_932737622) + 0.6020653267_6429947778
(72) 0.5063340961_2729292596
Type:
Float
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