Some Basic Help.

use Modern::Perl
open trained , 'D://ARP//libsvm-3.12//families//antioxidant//training.
+scale';
open predict , 'D://ARP//libsvm-3.12//families//antioxidant//testing.s
+cale';
my $counter =  0;
while (<trained>) {
    my $train = $_;
while (<predict>) {
    #print $_;
    
    my $predict = $1;
    if ($train = $predict) {
    #print $train;
    $counter = $counter + 1
}
}
}
print $counter;
[download]

Sup guys. There's something that I need to clarify. for the line "my $predict = $1;", i want to define it as the current line of <predict> in the while function. I tried $_ and it gave me the line from <trained,> but when I tried $1 it was initialized.

What should I do to get the line from <predict>?

Comment on Some Basic Help. Download Code
Re: Some Basic Help. by nemesdani (Friar) on Sep 24, 2012 at 07:57 UTC
$1 is the first bracketed match in a regular expression, you don't want that. Why didn't you write simply `my $predict = $_`? Another suggestion: use the 3 argument form of `open`. `if ($train = $predict)` is also wrong: You have to use `==` when checking. I'm too lazy to be proud of being impatient.	[reply] [d/l] [select]
Re: Some Basic Help. by kcott (Parson) on Sep 24, 2012 at 08:15 UTC
G'day invaderzard, I see a number of issues here: `use Modern::Perl` has no terminating semicolon. Your code for opening files is not the best. Take a look at open. `$1` holds data you've captured with a regexp. See perlre. If you follow the advice in the `open` documentation, you can write your `while` loops as `while (my $line = <$file_handle>) { ... }` which should solve your main problem. -- Ken	[reply] [d/l] [select]
Re: Some Basic Help. by Anonymous Monk on Sep 24, 2012 at 08:59 UTC
doubling up slashes in "D://" buys you nothing, it just looks odd	[reply]
Re: Some Basic Help. by Jenda (Monsignor) on Sep 24, 2012 at 09:01 UTC
`while (my $train = <trained>) { while (my $predict = <predict>) { ... } seek predict, 0, 0; // need to return to the start of the predict fil +e!!! }` [download] Also, the condition is wrong! It should be `if ($train == $predict)` if you want to compare numbers or `if ($train eq $predict)` if you want to compare strings. Perl is happy to convert values from one form to the other, but you have to tell it which one you want. Also in case the files contained floating point numbers the comparison using == would most probably not "work". The two numbers would have to be absolutely equal which is (also due to limited precision computation) very unlikely. You will want to test whether they are within a certain range from each other instead. You may also want to consider reading the files just once. Choose the smaller one, read it into an array or hash (as you seem to want to test for equality a hash would work better) and then read the other file and check whether the value is present in the array/hash. Jenda Enoch was right! Enjoy the last years of Rome.	[reply] [d/l] [select]
Re^2: Some Basic Help. by invaderzard (Acolyte) on Sep 25, 2012 at 07:14 UTC
What can you tell me about hashes? Thanks.	[reply]
Re^3: Some Basic Help. by Jenda (Monsignor) on Sep 25, 2012 at 08:06 UTC
Here's a quick intro. In your case you would not have any values in the hash, just keys. You'd read the smaller file and add the lines to a hash as keys (the values are irrelevant, use 1 for example). Then as you would read the other file you'd just check whether `exists $hash{$line}` and you'd know right away whether such line was in the first file or not. Jenda Enoch was right! Enjoy the last years of Rome.	[reply] [d/l]
Re^4: Some Basic Help. by invaderzard (Acolyte) on Sep 25, 2012 at 08:35 UTC
Re^5: Some Basic Help. by Jenda (Monsignor) on Sep 25, 2012 at 13:12 UTC
Some notes below your chosen depth have not been shown here
Re: Some Basic Help. by 2teez (Chaplain) on Sep 24, 2012 at 09:13 UTC
just to add to others mastery advice: "...i want to define it as the current line of ..." do like so: `... while(defined(my $trained = <trained>)){ chomp $trained; while(defined(my $predict = <predict>)){ chomp $predict; ... } ... }` [download] If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply] [d/l]


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Some Basic Help.

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