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16 template<typename MatrixType> bool find_pivot(typename MatrixType::Scalar tol, MatrixType &diffs, Index col=0)
19   if(match || col==diffs.cols())
27     for(Index i=col; i<n; ++i)
30       if(diffs.col(col).segment(col,n-i).minCoeff(&best_index) > tol)
33       best_index += col;
35       diffs.row(col).swap(diffs.row(best_index));
36       if(find_pivot(tol,diffs,col+1)) return true;
37       diffs.row(col).swap(diffs.row(best_index));
40       diffs.row(n-(i-col)-1).swap(diffs.row(best_index));
41       transpositions.push_back(std::pair<Index,Index>(n-(i-col)-1,best_index));