Re^2: hash references

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Re^3: hash references by jethro (Monsignor) on Aug 01, 2011 at 12:04 UTC
No, `@{$site1{$_}}` is a "normal" array. Hopefully `$site1{$_}` is a reference to an array, otherwise you are in trouble (either you have "use strict" then this will give an error, without it you might get no error but it still won't work as you intent What you probably want is something like `$site1{$_}->[1]`. This will access array index 1 of the array pointed to by `$site{$_}`	[reply] [d/l] [select]
Re^4: hash references by Anonymous Monk on Aug 01, 2011 at 12:19 UTC
i changed the code as follow,but still same error.:-( `my $m=($genome1{$_}->[1]-$genome2{$_}->[1]); my $n=($genome1{$_}->[0]-$genome2{$_}->[0]);` [download]	[reply] [d/l]
Re^5: hash references by jethro (Monsignor) on Aug 01, 2011 at 14:36 UTC
That is because you have more than one bug in your code. As JavaFan pointed out your subroutine begins with `my(%site1)=@_; my(%site2)=@_;` [download] which makes no sense as it will give you identical data in both variables. If you want to give two hashes to a subroutine you should use hash references instead, i.e. `sub x { my(%site1)= %{$_[0]}; my(%site2)= %{$_[1]}; ... } x(\%hash1,\%hash2);` [download] Also, as moritz repeatedly pointed out, you seem to have strings where you expected array references, so your data is different. So another bug is in the code outside of this subroutine Please use Data::Dumper to check up on your data. For example add a line `use Data::Dumper; print Dumper(\%site1);` [download] to your subroutine (and similar prints at other places) and compare your data structure with what you expect.	[reply] [d/l] [select]
Re^3: hash references by moritz (Cardinal) on Aug 01, 2011 at 11:49 UTC
If `$site{$_}` contains an array reference, you can simply get the first item with `$site{$_}[0]` - no need for all those curlies. Perl 6 - second systems done right	[reply] [d/l] [select]
Re^4: hash references by Anonymous Monk on Aug 01, 2011 at 11:57 UTC
in that case,i have this error.i really confused!! cant use string `<"[1,0]">` as an array ref while "strict ref" use at mainproject.pl line 245	[reply] [d/l]
Re^5: hash references by moritz (Cardinal) on Aug 01, 2011 at 12:01 UTC
So, did you read the error message? If yes, you'd know that what you thought was an array ref really is a string. So, read up on how to create array references - perlreftut, perllol. Perl 6 - second systems done right	[reply]