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Replaced an uggly for by a bit less uggly while for the matrix inversion.

This commit is contained in:
Sébastien Crozet 2013-05-15 01:10:18 +00:00
parent 30d82f2408
commit cfe636c11b
1 changed files with 15 additions and 8 deletions
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21
src/ndim/nmat.rs
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@ -107,23 +107,30 @@ Inv for NMat<D, T>
// FIXME: this is kind of uggly… // FIXME: this is kind of uggly…
// … but we cannot use position_betwee since we are iterating on one // … but we cannot use position_betwee since we are iterating on one
// columns // columns
let mut n0 = dim; // index of a non-zero entry let mut n0 = 0u; // index of a non-zero entry
for uint::range(k, dim) |i| while (n0 != dim)
{ {
n0 = k; if (cpy[(n0, k)] != _0T)
if (cpy[(i, k)] != _0T)
{ break; } { break; }
n0 += 1;
} }
assert!(n0 != dim); // non inversible matrix assert!(n0 != dim); // non inversible matrix
// swap pivot line // swap pivot line
if (n0 != k)
{
for uint::range(0u, dim) |j| for uint::range(0u, dim) |j|
{ {
swap(cpy.mij, NMat::offset::<D, T>(n0, j), NMat::offset::<D, T>(k, j)); swap(cpy.mij,
swap(res.mij, NMat::offset::<D, T>(n0, j), NMat::offset::<D, T>(k, j)); NMat::offset::<D, T>(n0, j),
NMat::offset::<D, T>(k, j));
swap(res.mij,
NMat::offset::<D, T>(n0, j),
NMat::offset::<D, T>(k, j));
}
} }
let pivot = cpy[(k, k)]; let pivot = cpy[(k, k)];