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use lapacke;
use num_traits::Zero;
use crate::error::*;
use crate::layout::MatrixLayout;
use crate::types::*;
use super::into_result;
#[repr(u8)]
enum FlagSVD {
All = b'A',
No = b'N',
}
pub struct SVDOutput<A: Scalar> {
pub s: Vec<A::Real>,
pub u: Option<Vec<A>>,
pub vt: Option<Vec<A>>,
}
pub trait SVD_: Scalar {
unsafe fn svd(l: 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, 1, Vec::new())
};
let (jvt, ldvt, mut vt) = if calc_vt {
(FlagSVD::All, n, vec![Self::zero(); (n * n) as usize])
} else {
(FlagSVD::No, n, Vec::new())
};
let mut s = vec![Self::Real::zero(); k as usize];
let mut superb = vec![Self::Real::zero(); (k - 1) as usize];
dbg!(ldvt);
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 calc_u { Some(u) } else { None },
vt: if calc_vt { Some(vt) } else { None },
},
)
}
}
};
}
impl_svd!(f64, lapacke::dgesvd);
impl_svd!(f32, lapacke::sgesvd);
impl_svd!(c64, lapacke::zgesvd);
impl_svd!(c32, lapacke::cgesvd);