Function builtin_svd 

fn builtin_svd(
    args: &[RValue],
    _: &[(String, RValue)],
) -> Result<RValue, RError>

svd(x) — Singular Value Decomposition via nalgebra’s bidiagonal SVD.

Returns a list with:

• $d: numeric vector of singular values (descending)
• $u: left singular vectors (m x min(m,n) matrix)
• $v: right singular vectors (n x min(m,n) matrix)