Index: /trunk/PS-IPP-Config/Build.PL
===================================================================
--- /trunk/PS-IPP-Config/Build.PL	(revision 8310)
+++ /trunk/PS-IPP-Config/Build.PL	(revision 8310)
@@ -0,0 +1,15 @@
+use Module::Build;
+# See perldoc Module::Build for details of how this works
+
+Module::Build->new(
+    module_name         => 'PS::IPP::Metadata',
+    dist_version        => '0.01',
+    author              => 'Paul Price <price@ifa.hawaii.edu> and Joshua Hoblitt <jhoblitt@cpan.org>',
+    license             => 'gpl',
+    create_makefile_pl  => 'passthrough',
+    requires            =>  {
+        'Carp'                      => 0,
+        'Class::Accessor::Fast'     => '0.19',
+	'Statistics::Descriptive'   => '2.6'	    
+	}
+)->create_build_script;
Index: /trunk/PS-IPP-Config/LICENSE
===================================================================
--- /trunk/PS-IPP-Config/LICENSE	(revision 8310)
+++ /trunk/PS-IPP-Config/LICENSE	(revision 8310)
@@ -0,0 +1,260 @@
+The General Public License (GPL)
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+
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+END OF TERMS AND CONDITIONS
Index: /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/List.pm
===================================================================
--- /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/List.pm	(revision 8310)
+++ /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/List.pm	(revision 8310)
@@ -0,0 +1,46 @@
+# Copyright (c) 2006  Paul Price, Joshua Hoblitt
+#
+# $Id: List.pm,v 1.1 2006-08-12 04:26:12 price Exp $
+
+package PS::IPP::Metadata::List;
+
+use strict;
+use warnings FATAL => qw( all );
+
+our $VERSION = '0.01';
+
+use Carp qw( carp );
+
+# Allow exporting of function
+use base qw( Exporter );
+our @EXPORT_OK = qw( parse_md_list );
+
+#$::RD_TRACE = 1;
+#$::RD_HINT = 1;
+#use Data::Dumper;
+
+# Given a parsed metadata, parse it into an array of hashes
+sub parse_md_list {
+    my $md = shift;		# Parsed metadata, from PS::IPP::Metadata::Config
+
+    my @array;			# The array of hashes, to be returned
+    foreach my $mdItem (@$md) {
+	if ($mdItem->{class} ne "metadata") {
+	    carp "MD element ", $mdItem->{name}, " isn't of type METADATA --- ignored.\n";
+	    next;
+	}
+	my %hash;		# Hash element
+	my $mdComponents = $mdItem->{value}; # Components of the metadata
+	foreach my $data (@$mdComponents) {
+	    $hash{$data->{name}} = $data->{value};
+	}
+	push @array, \%hash;
+    }
+
+    return \@array;
+}
+
+1;
+
+__END__;
+
Index: /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/Stats.pm
===================================================================
--- /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/Stats.pm	(revision 8310)
+++ /trunk/PS-IPP-Config/lib/PS/IPP/Metadata/Stats.pm	(revision 8310)
@@ -0,0 +1,187 @@
+# Copyright (c) 2006  Paul Price, Joshua Hoblitt
+#
+# $Id: Stats.pm,v 1.1 2006-08-12 04:26:12 price Exp $
+
+package PS::IPP::Metadata::Stats;
+
+use strict;
+use warnings FATAL => qw( all );
+
+our $VERSION = '0.01';
+
+use Carp qw( carp croak );
+use Statistics::Descriptive;
+
+use base qw( Class::Accessor::Fast );
+__PACKAGE__->mk_accessors( qw( bg_mean bg_stdev bg_mean_stdev constants variables ) );
+
+#$::RD_TRACE = 1;
+#$::RD_HINT = 1;
+use Data::Dumper;
+
+sub new {
+    my $class = shift;		# Class name
+    my $constants = shift;	# Array of values that should be constant through the FPA
+    my $variables = shift;	# Array of values that may be variable through the FPA
+
+    my $self = { bg_mean => undef, # Mean of the mean backgrounds
+		 bg_stdev => undef, # Standard deviation of the mean backgrounds
+		 bg_mean_stdev => undef, # Mean of the standard deviation of the backgrounds
+		 constants => $constants, # Array of values that should be constant through the FPA
+		 variables => $variables, # Array of values that may be variable through the FPA
+		 data => {}	# The data
+		 };
+    
+    # Populate object
+    foreach my $constant (@$constants) {
+	$self->{data}->{$constant} = { type => 'constant', # Type of value (constant/variable)
+				       value => undef # The actual variable
+				       };
+    }
+    foreach my $variable (@$variables) {
+	$self->{data}->{$variable} = { type => 'variable', # Type of value (constant/variable)
+				       data => [], # Array of data values
+				       mean => undef, # Mean of data values
+				       stdev => undef # Standard deviation of data values
+				       };
+    }
+
+    # Bless and return object
+    bless $self, $class;
+    return $self;
+}
+
+# Given a parsed metadata from ppStats, assemble summary statistics
+sub parse {
+    my $self = shift;		# Where we'll put the information
+    my $md = shift;		# Parsed metadata, from PS::IPP::Metadata::Config
+
+    my @backgrounds;		# Array of background measurements
+    my @bgStdevs;		# Array of background standard deviations
+
+    # Descend the FPA hierarchy
+    foreach my $fpaItem (@$md) {
+	if ($fpaItem->{class} eq "metadata") {
+	    my $chipName = $fpaItem->{name}; # Name of chip
+	    my $chipData = $fpaItem->{value}; # Chip-level data
+	    foreach my $chipItem (@$chipData) {
+		if ($chipItem->{class} eq "metadata") {
+		    my $cellName = $chipItem->{name}; # Name of cell
+		    my $cellData = $chipItem->{value}; # Cell-level data
+		    my $bgName; # Name of the value we measured
+		    my $bgStdevName; # Name of the stdev we measured
+		    foreach my $cellItem (@$cellData) {
+			if ($cellItem->{name} =~ /^(SAMPLE|ROBUST|FITTED|CLIPPED)_/) {
+			    # It's a statistic of some sort
+			    if ($cellItem->{name} =~ /_STDEV$/) {
+				if (defined $bgStdevName) {
+				    carp "Ignoring duplicate background stdev (", $cellItem->{name}, "). ",
+				    "Original is ", $bgStdevName, "\n";
+				    next;
+				}
+				$bgStdevName = $cellItem->{name};
+				push @bgStdevs, $cellItem->{value};
+			    } else {
+				if (defined $bgName) {
+				    carp "Ignoring duplicate background value (", $cellItem->{name}, "). ",
+				    "Original is ", $bgName, "\n";
+				    next;
+				}
+				$bgName = $cellItem->{name};
+				push @backgrounds, $cellItem->{value};
+			    }
+			} else {
+			    $self->_check_values($cellItem);
+			}
+		    }
+		} else {
+		    $self->_check_values($chipItem);
+		}
+	    }
+	} else {
+	    $self->_check_values($fpaItem);
+	}
+    }
+
+    # Check that we found everything for the constants
+    foreach my $constant (@{$self->constants()}) {
+	if (not defined $self->{data}->{$constant}->{value}) {
+	    carp "Unable to find value for ", $constant, "\n";
+	}
+    }
+
+    # Get mean, stdev for the variables
+    foreach my $variable (@{$self->variables()}) {
+	my $info = $self->{data}->{$variable}; # The information about this particular variable
+	my $array = $info->{data}; # The array of values collected
+	if (scalar @$array == 0) {
+	    carp "Unable to find any values for ", $variable, "\n";
+	    next;
+	}
+
+	# Get statistics on the value
+	my $stats = Statistics::Descriptive::Sparse->new(); # Statistics calculator
+	$stats->add_data(@$array);
+	$info->{mean} = $stats->mean();
+	$info->{stdev} = $stats->standard_deviation();
+    }
+	
+    # Get mean, stdev, mean stdev for the background
+    my $meanStats = Statistics::Descriptive::Sparse->new(); # Statistics for mean
+    $meanStats->add_data(@backgrounds);
+    $self->bg_mean($meanStats->mean());
+    $self->bg_stdev($meanStats->standard_deviation());
+    my $stdevStats = Statistics::Descriptive::Sparse->new(); # Statistics for standard deviation
+    $stdevStats->add_data(@bgStdevs);
+    $self->bg_mean_stdev($stdevStats->mean());
+
+    return $self;
+}
+
+
+# Private function to check a metadata item for things we're interested in
+sub _check_values {
+    my $self = shift;
+    my $mdItem = shift;		# Metadata item to check
+
+    my $name = $mdItem->{name};	# Name of the item
+    my $value = $mdItem->{value}; # Value of the item
+
+    my $data = $self->{data};	# The data
+    return if not defined $data->{$name}; # Not interested
+    my $type = $data->{$name}->{type}; # Type of the item: constant or variable
+
+    if ($type eq 'constant') {
+	if (defined $data->{$name}->{value} && ($data->{$name}->{value} ne $value)) {
+	    carp "Warning: different value for ", $name, " found: ", $data->{$name}->{value}, " (old) vs ", 
+	    $value, " (new).  Ignoring new value.\n";
+	    return;
+	}
+	$data->{$name}->{value} = $value;
+	return;
+    }
+
+    if ($type eq 'variable') {
+	my $array = $data->{$name}->{data}; # Array containing all the values
+	push @$array, $value;
+	return;
+    }
+
+    croak "Unrecognised type (", $type, ") for value of ", $name, "\n";
+    return;
+}
+
+# Return the data structure for a particular value, or the entire hash
+sub data {
+    my $self = shift;
+    my $name = shift;		# Name of data to return
+
+    return $self->{data} if (not defined $name);
+    return $self->{data}->{$name};
+}
+
+
+1;
+
+__END__;
+
