Re: Date::manip query
im importing data from an excel spreadsheet into an array of hashes.
the date is initially converted using Date::Format::Excel.
for this bit
{START} = unix start time .{START_DS} = string that I use to convert
to unixtime with
my $var=0;my [EMAIL PROTECTED];
while ($var$va_length)
{
print ${$daylistsorted[$var]}{TH} ;
print 'from ';
print ${$daylistsorted[$var]}{START};
print ' to '.${$daylistsorted[$var]}{END_DS};
printduration ;print int((${$daylistsorted[$var]}{END}-$
{$daylistsorted[$var]}{START})/60);
if (exists( ${$daylistsorted[$var+1]}{TH} ) )
{
print \tinterval to next start ; print int ((${$daylistsorted[$var
+1]}{START}-${$daylistsorted[$var]}{END})/60);print \n;
}
$var++;
}}
Sat 04-08-2007
=
1 from 1186220100 to 2007:08:04 10:33 duration 58 interval to next
start 34
4 from 1186225620 to 2007:08:04 13:29 duration 142 interval to
next start 26
and when i change it to
#print ${$daylistsorted[$var]}{START};
print UnixDate(${$daylistsorted[$var]}{START}, '%Y:%m:%d %H:%M');
I get this
Sat 04-08-2007
=
1 from to 2007:08:04 10:33 duration 58 interval to next start
34
4 from to 2007:08:04 13:29 duration 142 interval to next start
26
with both dates as strings
Sat 04-08-2007
=
1 from 2007:08:04 09:35 to 2007:08:04 10:33 duration 58 interval
to next start 34
4 from 2007:08:04 11:07 to 2007:08:04 13:29 duration 142 interval
to next start 26
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Re: regex, 1 off...
Seems it's related to a more general question stated as `Given 2 sequences, find longest common sub sequence'. Many algorithm books have materials about this one. -Todd -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: regex, 1 off...
However much depends on the actual data and the variations that you are expecting. If you are searching for words like those used in the English language then you may want to look at how spell checking software works. Seems related to the algorithm like `find the longest common sub sequence of give 2 sequences'. Many algorithm books covers it. -Todd -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Can't use string as a symbol ref
Can somebody enlighten me what I'm doing wrong? I have a list in a file , test.dat sh cat test1.dat 0039 0038 sh cat test1.pl #!/usr/bin/perl -w use strict; my $input = $ARGV[0]; my @devices = $input ; print devices = @devices \n; __END__ now run it with sh test.pl test1.dat Can't use string (test1.dat) as a symbol ref while strict refs in use at ./test.pl line xx. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Can't use string as a symbol ref
On 12/17/07, ciwei2103 [EMAIL PROTECTED] wrote: Can somebody enlighten me what I'm doing wrong? my $input = $ARGV[0]; my @devices = $input ; $input is a string, since it comes from @ARGV; but you're using it as if it's a filehandle. Do you need open()? Hope this helps! --Tom Phoenix Stonehenge Perl Training -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Can't use string as a symbol ref
Maybe tell us what you are trying to do? Try this: #!/usr/bin/perl -w use strict; my $input = $ARGV[0]; # File handle my $FH; # Check the file is a normal file and exists die File does not exist\n if not -f $input; # Open the file handle for read only, file named by $input # Or die and print $! which is probably not the error message # variable. perlvar would tell you the corrent variable. open $FH, '', $input or die $!; # Read from the file handle my @devices = $FH ; # The the array elements with a , print devices = , join (, , @devices), \n; __END__ -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Can't use string as a symbol ref
On Dec 17, 2007 10:19 AM, ciwei2103 [EMAIL PROTECTED] wrote:
Can somebody enlighten me what I'm doing wrong?
I have a list in a file , test.dat
sh cat test1.dat
0039
0038
sh cat test1.pl
#!/usr/bin/perl -w
use strict;
my $input = $ARGV[0];
my @devices = $input ;
print devices = @devices \n;
__END__
now run it with
sh test.pl test1.dat
Can't use string (test1.dat) as a symbol ref while strict refs in
use at ./test.pl line xx.
In addition to using open as others have suggested, if the only
arguments the script is expecting are files to process, you don't need
to use open; the operator will automagically open files named in
@ARGV if given no file handle:
#!/usr/bin/perl
use strict;
use warnings;
my @devices = ;
print devices = @devices\n;
However, it is considered a bad idea to slurp all of a file into an
array (unless you are one hundred percent certain the files are
small). It is better to write your code to handle things in pieces (a
line at a time). A common way to do this is to use a while loop:
#!/usr/bin/perl
use strict;
use warnings;
while (my $device = ) {
#do something with each device
}
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Re: regex, 1 off...
On Dec 16, 2007 2:21 PM, namotco [EMAIL PROTECTED] wrote:
Let's say I want to search some text for abc123. However, we know
people can make typos and so they could have entered avc123 or abc223
or sbc123 or bc123 many other combinations...
So I want to search for those possibilities as well. So how would I
go about creating the proper regex?
Thanks!
How do you define a typo? How do you know whether it's a typo, or a
different string? Do you know, for instance, that only 'abc\d\d\d' is
valid, and 'avc\d\d\d' is never valid? If so, you could do something
like:
if (/^abc\d\d\d$/ or s/^a.c(\d\d\d)$/abc$1/) {
# match!
} else {
#no match!
}
If you can't predict the input, though, you'll need some heavy duty
algorithmic logic. Take a look through CPAN and see if there isn't
something that meets your needs. String::Approx and
String::KeyboardDistance might be places to start. There are also a
number of things in the Text::* tree.
HTH,
-- jay
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Re: Date::manip query
On Dec 17, 3:22 am, [EMAIL PROTECTED] (Pauld) wrote:
my $var=0;my [EMAIL PROTECTED];
while ($var$va_length)
{
print ${$daylistsorted[$var]}{TH} ;
print 'from ';
print ${$daylistsorted[$var]}{START};
print ' to '.${$daylistsorted[$var]}{END_DS};
printduration ;print int((${$daylistsorted[$var]}{END}-$
{$daylistsorted[$var]}{START})/60);
It's unusual in Perl to need to access an array element by its index
number. This is one of those times, though, when it is useful to use
an index because you need to peek ahead at the next item in the
array. But you only need the index for the next item, not for the
current item, so you can clean up things a bit with something like
this (untested, and posted without much effort to parse or understand
the objective of the code, and using printf instead of a bunch of
concat'ed strings):
my $index = 0;
foreach my $day( @daylistsorted ) {
printf (
%s from $s to %s duration %s %s\n,
$day{'TH'},
UnixDate($day{'START'}, '%Y:%m:%d %H:%M'),
UnixDate($day{'END_DS'}, '%Y:%m:%d %H:%M'),
int(($day{END} - $day{START})/60);
(exists( ${$daylistsorted[$index+1]}{TH} ) )
? \tinterval to next start
.int (( ${$daylistsorted[$index+1]}{START}
-$day{END} )/60)
: ''
);
$index++;
}
--
The best way to get a good answer is to ask a good question.
David Filmer (http://DavidFilmer.com)
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Re: regex, 1 off...
namotco wrote: Let's say I want to search some text for abc123. However, we know people can make typos and so they could have entered avc123 or abc223 or sbc123 or bc123 many other combinations... So I want to search for those possibilities as well. So how would I go about creating the proper regex? I don't think a regex is appropriate in this case, but if you want to write something that guesses at what a misspelled string should have been then search the Web for Damerau-Levenshtein distance, which is very effective and the algorithm codes up fairly simply. Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Date::manip query
On Monday 17 December 2007 15:40, [EMAIL PROTECTED] wrote:
On Dec 17, 3:22 am, [EMAIL PROTECTED] (Pauld) wrote:
my $var=0;my [EMAIL PROTECTED];
while ($var$va_length)
{
print ${$daylistsorted[$var]}{TH} ;
print 'from ';
print ${$daylistsorted[$var]}{START};
print ' to '.${$daylistsorted[$var]}{END_DS};
printduration ;print int((${$daylistsorted[$var]}{END}-$
{$daylistsorted[$var]}{START})/60);
It's unusual in Perl to need to access an array element by its index
number. This is one of those times, though, when it is useful to use
an index because you need to peek ahead at the next item in the
array. But you only need the index for the next item, not for the
current item, so you can clean up things a bit with something like
this (untested, and posted without much effort to parse or understand
the objective of the code, and using printf instead of a bunch of
concat'ed strings):
my $index = 0;
foreach my $day( @daylistsorted ) {
The way it is *usually* done is:
foreach my $index ( 0 .. $#daylistsorted ) {
printf (
%s from $s to %s duration %s %s\n,
$day{'TH'},
An array element can hold a hash reference but not a hash itself:
$day-{ TH },
UnixDate($day{'START'}, '%Y:%m:%d %H:%M'),
$day-{ START }
UnixDate($day{'END_DS'}, '%Y:%m:%d %H:%M'),
$day-{ END_DS }
int(($day{END} - $day{START})/60);
$day-{ END } - $day-{ START }
(exists( ${$daylistsorted[$index+1]}{TH} ) )
? \tinterval to next start
.int (( ${$daylistsorted[$index+1]}{START}
-$day{END} )/60)
$day-{ END }
: ''
);
$index++;
}
John
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Re: Date::manip query
On Dec 18, 2007 1:05 AM, John W. Krahn [EMAIL PROTECTED] wrote: snip printf ( %s from $s to %s duration %s %s\n, snip You missed the usage of $s instead of %s. I always get bitten by that. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
