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use lapack::c;
use num_traits::Zero;
use error::*;
use layout::MatrixLayout;
use types::*;
use super::into_result;
#[repr(u8)]
enum FlagSVD {
All = b'A',
No = b'N',
}
pub struct SVDOutput<A: AssociatedReal> {
pub s: Vec<A::Real>,
pub u: Option<Vec<A>>,
pub vt: Option<Vec<A>>,
}
pub trait SVD_: AssociatedReal {
unsafe fn svd(MatrixLayout, calc_u: bool, calc_vt: bool, a: &mut [Self]) -> Result<SVDOutput<Self>>;
}
macro_rules! impl_svd {
($scalar:ty, $gesvd:path) => {
impl SVD_ for $scalar {
unsafe fn svd(l: MatrixLayout, calc_u: bool, calc_vt: bool, mut a: &mut [Self]) -> Result<SVDOutput<Self>> {
let (m, n) = l.size();
let k = ::std::cmp::min(n, m);
let lda = l.lda();
let (ju, ldu, mut u) = if calc_u {
(FlagSVD::All, m, vec![Self::zero(); (m*m) as usize])
} else {
(FlagSVD::No, 0, Vec::new())
};
let (jvt, ldvt, mut vt) = if calc_vt {
(FlagSVD::All, n, vec![Self::zero(); (n*n) as usize])
} else {
(FlagSVD::No, 0, Vec::new())
};
let mut s = vec![Self::Real::zero(); k as usize];
let mut superb = vec![Self::Real::zero(); (k-2) as usize];
let info = $gesvd(l.lapacke_layout(), ju as u8, jvt as u8, m, n, &mut a, lda, &mut s, &mut u, ldu, &mut vt, ldvt, &mut superb);
into_result(info, SVDOutput {
s: s,
u: if ldu > 0 { Some(u) } else { None },
vt: if ldvt > 0 { Some(vt) } else { None },
})
}
}
}}
impl_svd!(f64, c::dgesvd);
impl_svd!(f32, c::sgesvd);
impl_svd!(c64, c::zgesvd);
impl_svd!(c32, c::cgesvd);