https://bioinformaticsonline.com/snippets/view/30764/calculate-some-statistics-for-a-dna-alignment-with-perl? https://bioinformaticsonline.com/snippets/view/30764/calculate-some-statistics-for-a-dna-alignment-with-perl Thu, 02 Feb 2017 04:11:54 -0600 https://bioinformaticsonline.com/snippets/view/30764/calculate-some-statistics-for-a-dna-alignment-with-perl use Bio::AlignIO; use Bio::Align::DNAStatistics; my $stats = Bio::Align::DNAStatistics->new(); my $alignin = Bio::AlignIO->new(-format => 'emboss', -file => 't/data/insulin.water'); my $aln = $alignin->next_aln; my $jcmatrix = $stats->distance(-align => $aln, -method => 'Jukes-Cantor'); print $jcmatrix->print_matrix; ## and for measurements of synonymous /nonsynonymous substitutions ## my $in = Bio::AlignIO->new(-format => 'fasta', -file => 't/data/nei_gojobori_test.aln'); my $alnobj = $in->next_aln; my ($seq1id,$seq2id) = map { $_->display_id } $alnobj->each_seq; my $results = $stats->calc_KaKs_pair($alnobj, $seq1id, $seq2id); print "comparing ".$results->[0]{'Seq1'}." and ".$results->[0]{'Seq2'}."\n"; for (sort keys %{$results->[0]} ){ next if /Seq/; printf("%-9s %.4f \n",$_ , $results->[0]{$_}); } my $results2 = $stats->calc_all_KaKs_pairs($alnobj); for my $an (@$results2){ print "comparing ". $an->{'Seq1'}." and ". $an->{'Seq2'}. " \n"; for (sort keys %$an ){ next if /Seq/; printf("%-9s %.4f \n",$_ , $an->{$_}); } print "\n\n"; } my $result3 = $stats->calc_average_KaKs($alnobj, 1000); for (sort keys %$result3 ){ next if /Seq/; printf("%-9s %.4f \n",$_ , $result3->{$_}); }]]> Abhimanyu Singh