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Re: compare values while value on other column remains the same

by CountZero (Bishop)
on Sep 22, 2012 at 12:16 UTC ( #995094=note: print w/replies, xml ) Need Help??

in reply to compare values while value on other column remains the same

I turned your data into a tab-separated CSV file and added a line of headers (fieldnames). Then I could use DBI to attack your problem with SQL.
use Modern::Perl; use DBI; my $dbh = DBI->connect( "dbi:CSV:", "", "", { f_dir => './DB', csv_sep_char => "\t", } ) or die "Cannot connect: $DBI::errstr"; my $sql = 'SELECT id, count(*) AS number, sum(tumor) AS tumorscore, sum(normal) +AS normalscore, sum(tumor - normal) AS difference, avg(tumor - normal +) AS averagedifference FROM methyl WHERE (tumor - normal) <=20 or (tu +mor - normal) >=20 GROUP BY id ORDER BY id'; my $sth = $dbh->prepare($sql); $sth->execute; while ( my $row = $sth->fetchrow_hashref ) { say "id: $row->{'id'}, Count: $row->{'number'}, Score tumor: $row->{'tumor +score'}, Score normal: $row->{'normalscore'}, Difference: $row->{'dif +ference'}, Average Difference: $row->{'averagedifference'}"; }
id: cg00381604, Count: 3, Score tumor: 99, Score normal: 174, Differen +ce: -75, Average Difference: -25 id: cg03130891, Count: 1, Score tumor: 55, Score normal: 84, Differenc +e: -29, Average Difference: -29 id: cg12045430, Count: 3, Score tumor: 129, Score normal: 174, Differe +nce: -45, Average Difference: -15 id: cg13869341, Count: 1, Score tumor: 908, Score normal: 913, Differe +nce: -5, Average Difference: -5 id: cg14008030, Count: 1, Score tumor: 688, Score normal: 776, Differe +nce: -88, Average Difference: -88 id: cg20253340, Count: 1, Score tumor: 560, Score normal: 593, Differe +nce: -33, Average Difference: -33 id: cg20826792, Count: 3, Score tumor: 171, Score normal: 174, Differe +nce: -3, Average Difference: -1 id: cg21870274, Count: 1, Score tumor: 791, Score normal: 809, Differe +nce: -18, Average Difference: -18
To exclude as much as possible any rounding-of errors I did not divide the figures by 1000.


A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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