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This commit is contained in:
Ahmet Inan 2023-04-25 09:48:34 +02:00
commit 43a0f7a5ec
1 changed files with 3 additions and 12 deletions
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15
cauchy_reed_solomon_erasure_coding.hh
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@ -54,23 +54,14 @@ struct CauchyReedSolomonDecoder
IndexType inverse_cauchy_matrix(const ValueType *rows, int i, int j, int n)
{
ValueType col_i(ValueType::N - i);
IndexType prod_xy(0);
IndexType prod_xy(0), prod_x(0), prod_y(0);
for (int k = 0; k < n; k++) {
ValueType col_k(ValueType::N - k);
prod_xy *= index(rows[j] + col_k) * index(rows[k] + col_i);
}
IndexType prod_x(0);
for (int k = 0; k < n; k++) {
if (k != j) {
if (k != j)
prod_x *= index(rows[j] + rows[k]);
}
}
IndexType prod_y(0);
for (int k = 0; k < n; k++) {
if (k != i) {
ValueType col_k(ValueType::N - k);
if (k != i)
prod_y *= index(col_i + col_k);
}
}
return prod_xy / (index(rows[j] + col_i) * prod_x * prod_y);
}