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Fixed bug by introducing one norm

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This commit is contained in:
Fredrik Jansson 2020-04-02 09:38:18 +02:00
parent c0a6df55b1
commit 2696ffd7a1
1 changed files with 40 additions and 11 deletions
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51
src/linalg/exp.rs
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@ -121,28 +121,28 @@ where
fn d4_tight(&mut self) -> N {
if self.d4_exact.is_none() {
self.d4_exact = Some(self.a4().amax().powf(N::from_f64(0.25).unwrap()));
self.d4_exact = Some(one_norm(self.a4()).powf(N::from_f64(0.25).unwrap()));
}
self.d4_exact.unwrap()
}
fn d6_tight(&mut self) -> N {
if self.d6_exact.is_none() {
self.d6_exact = Some(self.a6().amax().powf(N::from_f64(1.0 / 6.0).unwrap()));
self.d6_exact = Some(one_norm(self.a6()).powf(N::from_f64(1.0 / 6.0).unwrap()));
}
self.d6_exact.unwrap()
}
fn d8_tight(&mut self) -> N {
if self.d8_exact.is_none() {
self.d8_exact = Some(self.a8().amax().powf(N::from_f64(1.0 / 8.0).unwrap()));
self.d8_exact = Some(one_norm(self.a8()).powf(N::from_f64(1.0 / 8.0).unwrap()));
}
self.d8_exact.unwrap()
}
fn d10_tight(&mut self) -> N {
if self.d10_exact.is_none() {
self.d10_exact = Some(self.a10().amax().powf(N::from_f64(1.0 / 10.0).unwrap()));
self.d10_exact = Some(one_norm(self.a10()).powf(N::from_f64(1.0 / 10.0).unwrap()));
}
self.d10_exact.unwrap()
}
@ -157,7 +157,7 @@ where
}
if self.d4_approx.is_none() {
self.d4_approx = Some(self.a4().amax().powf(N::from_f64(0.25).unwrap()));
self.d4_approx = Some(one_norm(self.a4()).powf(N::from_f64(0.25).unwrap()));
}
self.d4_approx.unwrap()
@ -173,7 +173,7 @@ where
}
if self.d6_approx.is_none() {
self.d6_approx = Some(self.a6().amax().powf(N::from_f64(1.0 / 6.0).unwrap()));
self.d6_approx = Some(one_norm(self.a6()).powf(N::from_f64(1.0 / 6.0).unwrap()));
}
self.d6_approx.unwrap()
@ -189,7 +189,7 @@ where
}
if self.d8_approx.is_none() {
self.d8_approx = Some(self.a8().amax().powf(N::from_f64(1.0 / 8.0).unwrap()));
self.d8_approx = Some(one_norm(self.a8()).powf(N::from_f64(1.0 / 8.0).unwrap()));
}
self.d8_approx.unwrap()
@ -205,7 +205,7 @@ where
}
if self.d10_approx.is_none() {
self.d10_approx = Some(self.a10().amax().powf(N::from_f64(1.0 / 10.0).unwrap()));
self.d10_approx = Some(one_norm(self.a10()).powf(N::from_f64(1.0 / 10.0).unwrap()));
}
self.d10_approx.unwrap()
@ -333,7 +333,7 @@ where
v = &m * v;
}
v.amax()
one_norm(&v)
}
fn ell<N, R>(a: &MatrixN<N, R>, m: u64) -> u64
@ -353,7 +353,7 @@ where
let choose_2m_m =
factorial(2 * m as u128) / (factorial(m as u128) * factorial(2 * m as u128 - m as u128));
let abs_c_recip = choose_2m_m * factorial(2 * m as u128 + 1);
let alpha = a_abs_onenorm / a.amax();
let alpha = a_abs_onenorm / one_norm(a);
let alpha = alpha / N::from_u128(abs_c_recip).unwrap();
let u = N::from_f64(2_f64.powf(-53.0)).unwrap();
@ -378,6 +378,24 @@ where
q.lu().solve(&p).unwrap()
}
pub fn one_norm<N, R>(m: &MatrixN<N, R>) -> N
where
N: RealField,
R: DimName,
DefaultAllocator: Allocator<N, R, R>,
{
let mut col_sums = vec![N::zero(); m.ncols()];
for i in 0..m.ncols() {
let col = m.column(i);
col.iter().for_each(|v| col_sums[i] += v.abs());
}
let mut max = col_sums[0];
for i in 1..col_sums.len() {
max = N::max(max, col_sums[i]);
}
max
}
impl<N: RealField, R: DimMin<R, Output = R> + DimName> MatrixN<N, R>
where
DefaultAllocator: Allocator<N, R, R> + Allocator<(usize, usize), DimMinimum<R, R>>,
@ -389,7 +407,7 @@ where
return self.clone().map(|v| v.exp());
}
let mut h = ExpmPadeHelper::new(self.clone(), true);
let mut h = ExpmPadeHelper::new(self.clone(), false);
let eta_1 = N::max(h.d4_loose(), h.d6_loose());
if eta_1 < N::from_f64(1.495585217958292e-002).unwrap() && ell(&h.a, 3) == 0 {
@ -443,3 +461,14 @@ where
x
}
}
#[cfg(test)]
mod tests {
#[test]
fn one_norm() {
use crate::Matrix3;
let m = Matrix3::new(-3.0, 5.0, 7.0, 2.0, 6.0, 4.0, 0.0, 2.0, 8.0);
assert_eq!(super::one_norm(&m), 19.0);
}
}