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Implementation of the function
f \colon B_n \to [0,∞),\, \vec{x} \mapsto f(\vec{x}) = \frac{1}{(2π)^{n/2}}\exp(-\Vert\vec{x}\Vert_2^2/2) = \frac{1}{(2π)^{n/2}}\exp(-\frac{1}{2}∑_{i=1}^n x_i^2),
where n \in \{1,2,3,…\} is the dimension of the integration domain B_n = \{\vec{x}\in R^n : \Vert \vec{x} \Vert_2 ≤q 1\}. In this case the integral is know to be
\int_{B_n} f(\vec{x}) d\vec{x} = P[Z ≤q 1] = F_{χ^2_n}(1),
where Z follows a chisquare distribution with n degrees of freedom.
The instance needs to be created with one parameter representing n.
dim
An integer that captures the dimension
1 2 | n <- as.integer(3)
f <- new("unitBall_normGauss",dim=n)
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