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Homework and Emergencies Homework & Coursework Questions Sort function -- My First Unix Homework! Post 302453648 by eeweepoh on Thursday 16th of September 2010 01:42:39 AM
Old 09-16-2010
Sort function -- My First Unix Homework!

1. The problem statement, all variables and given/known data:
To sort a data


2. Relevant commands, code, scripts, algorithms:
The data provided is saved in dummy.txt and provided in LIBSVM format, but I think this information is redundant..
Code:
+1 1:2     2:4      4:3.2
-1 2:2.1   2:2.1   6:5.9
+1 1:-6    2:-4    4:2.2
-1 1:9.6   2:6.3   6:5.8
+1 1:2.98  2:5.6   4:8.1
-1 3:0.3   3:0.3   5:4.1


And we have to use functions cut, sort, or tr to sort the data. The sorted data should be in this form: (From my observation the data is only sorted by looking at the first field.)
Code:
+1 1:2      2:4     4:3.2
+1 1:-6     2:-4   4:2.2
+1 1:2.98   2:5.6  4:8.1
-1 2:2.1    2:2.1  6:5.9
-1 1:9.6    2:6.3  6:5.8
-1 3:0.3    3:0.3  5:4.1


3. The attempts at a solution (include all code and scripts):
I tried
Code:
sort -t ' ' -k 0, 1 dummy.txt
sort -n -k 1,1 -r dummy.txt

but they both sorted the data using the second field as well..

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Purdue University West Lafayette USA
Prof. Vishy, STAT598

Moderator's Comments:
Mod Comment Do not use PHP code tags when the data is not PHP code.

Last edited by eeweepoh; 09-16-2010 at 02:48 AM..
 

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ModPerl::Code(3)					User Contributed Perl Documentation					  ModPerl::Code(3)

NAME
$class::Const - Perl Interface for $class Constants SYNOPSIS
CONSTANTS
EOF my $groups = $data{$class}; for my $group (sort keys %$groups) { print $fh <<"EOF"; ":$group" use $class::Const -compile qw(:$group); The ":$group" group is for XXX constants. EOF for my $const (sort @{ $groups->{$group} }) { print $fh "=head3 C<$class::$const> "; } } print $fh "=cut "; } } sub generate_constants_lookup_doc { my ($data) = @_; foreach my $class (sort keys %$Apache2::ConstantsTable) { my $groups = $Apache2::ConstantsTable->{$class}; my $constants = [sort map { @$_ } values %$groups]; constants_lookup_code_doc($constants, $class, $data); } } sub generate_constants_group_lookup_doc { my ($data) = @_; foreach my $class (sort keys %$Apache2::ConstantsTable) { my $groups = $Apache2::ConstantsTable->{$class}; constants_group_lookup_code_doc($class, $groups, $data); } } sub constants_group_lookup_code_doc { my ($class, $groups, $data) = @_; my @tags; my @code; while (my ($group, $constants) = each %$groups) { $data->{$class}{$group} = [ map { my @ifdef = constants_ifdef($_); s/^($constant_prefixes)_?//o; $seen_const{$class}{$_}++; $_; } @$constants ]; } } sub constants_lookup_code_doc { my ($constants, $class, $data) = @_; my (%switch, %alias); %alias = %shortcuts; my $postfix = lc $class; my $package = $class . '::'; my $package_len = length $package; my $func = canon_func(qw(constants lookup), $postfix); for (@$constants) { if (s/^($constant_prefixes)(_)?//o) { $alias{$_} = join $2 || "", $1, $_; } else { $alias{$_} ||= $_; } next unless /^([A-Z])/; push @{ $switch{$1} }, $_; } for my $key (sort keys %switch) { my $names = $switch{$key}; for my $name (@$names) { my @ifdef = constants_ifdef($alias{$name}); push @{ $data->{$class}{other} }, $name unless $seen_const{$class}{$name} } } } sub generate_exports { my ($self, $c_fh) = @_; require ModPerl::WrapXS; ModPerl::WrapXS->generate_exports($c_fh); } # src/modules/perl/*.c files needed to build APR/APR::* outside # of mod_perl.so sub src_apr_ext { return map { "modperl_$_" } (qw(error bucket), map { "common_$_" } qw(util log)); } 1; __END__ NAME
ModPerl::Code - Generate mod_perl glue code SYNOPSIS
use ModPerl::Code (); my $code = ModPerl::Code->new; $code->generate; DESCRIPTION
This module provides functionality for generating mod_perl glue code. Reason this code is generated rather than written by hand include: consistency thin and clean glue code enable/disable features (without #ifdefs) adapt to changes in Apache experiment with different approaches to gluing AUTHOR
Doug MacEachern perl v5.18.2 2015-06-18 ModPerl::Code(3)
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