Added load methods for MATLAB(tm)

matlab/loadDataset.m

@@ -0,0 +1,31 @@
+function [ spectra, labels, wavelengths ] = loadDataset( filename )
+%LOADDATASET Load a dataset from the sugar dataset
+
+if ( nargin < 1 || isempty( filename ) || ~ischar( filename ) )
+    error( 'Parameter is not a valid filename' );
+end;
+
+if ( exist( filename, 'file' ) ~= 2   )
+    error( [ 'File "' filename '" does not exist.' ] );
+end;
+
+
+% load data from file
+temp = load( filename );
+
+% first line is wavelength vector
+wavelengths = temp( 1, : );
+% very first value is dropped, since the wavelength vector has no class
+wavelengths = wavelengths( 2:end );
+
+% drop first line from data
+temp = temp( 2:end, : );
+
+% labels stored in first column
+labels = temp( :, 1 );
+% spectral information is stored in the following columns
+spectra = temp( :, 2:end );
+
+
+end
+

matlab/reformulateDataset.m

@@ -0,0 +1,82 @@
+function [ newData, newLabel ] = reformulateDataset( data, label, problemIndex )
+%REFORMULATEDATASET Translates a loaded dataset for the different problems.
+%   It is assumed, that the loaded dataset is anotated according to problem
+%   0. Using this function the problem can be translated to the problem 1
+%   to 4.
+
+newLabel = label;
+newData = data;
+
+
+if ( problemIndex == 0 )
+    % Default 9 class problem
+    % 1 - Ester S170
+    % 2 - Ester S770
+    % 3 - Ester S1570
+    % 4 - Ester P1570
+    % 5 - Mannitol
+    % 6 - Sorbitol
+    % 7 - Glucose
+    % 8 - Galactose
+    % 9 - Fructose
+
+    % This is the default configuration of the dataset, no changes to be
+    % made.    
+
+%     warning( 'Data in dataset files is already label according to problem 0. No need for data translation here.' );
+
+elseif ( problemIndex == 1 )
+    % Create three class problem:
+    % 1 - Ester     ( S170, S770, S1570, P1570 )
+    % 2 - C6H14O6   ( Sorbitol, Mannitol )
+    % 3 - C6H12O6   ( Glucose, Galactose, Fructose )
+
+    % Ester
+    newLabel( label == 1 ) = 1;
+    newLabel( label == 2 ) = 1;
+    newLabel( label == 3 ) = 1;
+    newLabel( label == 4 ) = 1;
+    % C6H12O6
+    newLabel( label == 5 ) = 2;
+    newLabel( label == 6 ) = 2;
+    % C6H14O6
+    newLabel( label == 7 ) = 3;
+    newLabel( label == 8 ) = 3;
+    newLabel( label == 9 ) = 3;
+
+
+elseif ( problemIndex == 2 )
+    % Only Ester
+    % 1 - Ester S170
+    % 2 - Ester S770
+    % 3 - Ester S1570
+    % 4 - Ester P1570    
+    newData = data( label == 1 | label == 2 | label == 3 | label == 4, : );
+    newLabel = label( label == 1 | label == 2 | label == 3 | label == 4 );
+
+elseif ( problemIndex == 3 )
+    % Only C6H12O6
+    % 1 - Mannitol
+    % 2 - Sorbitol
+    newData = data( label == 5 | label == 6, : );
+    newLabel = label( label == 5 | label == 6 );
+    newLabel( newLabel == 5 ) = 1;
+    newLabel( newLabel == 6 ) = 2;
+
+elseif ( problemIndex == 4 )
+    % Only C6H14O6
+    % 1 - Glucose
+    % 2 - Galactose
+    % 3 - Fructose
+    newData = data( label == 7 | label == 8 | label == 9, : );
+    newLabel = label( label == 7 | label == 8 | label == 9 );
+    newLabel( newLabel == 7 ) = 1;
+    newLabel( newLabel == 8 ) = 2;
+    newLabel( newLabel == 9 ) = 3;    
+
+else
+    warning( [ 'Problem with number ' num2str( problemIndex ) ' is not specified. Returning data unmodified.' ] );
+end;
+
+end
+