Re^2: how to set a value for a hash reference

thank you for the details and the loop suggestion. The "//" means if for a and b overlap doesn't exist then it equals zero, right?

But where would I put this line? after the loop? no -> between the $a and $b? would I have to embed it in a loop with a and b being all elements of members?

Comment on Re^2: how to set a value for a hash reference

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Re^3: how to set a value for a hash reference by moritz (Cardinal) on Mar 14, 2012 at 13:19 UTC
The "//" means if for a and b overlap doesn't exist then it equals zero, right? Correct. It's the "defined-or" operator. But where would I put this line? after the loop? Wherever your read the values of `$overlap`. Perl 6 - second systems done right	[reply] [d/l]
Re^4: how to set a value for a hash reference by AWallBuilder (Beadle) on Mar 14, 2012 at 13:34 UTC
hmmm - I guess its a bit complicated because I"m just passing the entire hash reference to another script that writes the output in a nice matrix format. And I don't want to modify "write_R_matirx". any other suggestions? `use Smash::Utils::MatrixIO qw(:all); my $SMASH_overlap_file="$CDHIT_file.smash.overlap"; write_R_matrix($SMASH_overlap_file,$overlap);` [download]	[reply] [d/l]
Re^5: how to set a value for a hash reference by moritz (Cardinal) on Mar 14, 2012 at 14:53 UTC
Then you do need the initialization. You could write something along the lines of `for my $a (@members) { for my $b (@memebers) { $overlap->{$a}{$b} = 0; } }` [download] before the other loop. Perl 6 - second systems done right	[reply] [d/l]