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1 function [clip_magnagenres, magnagenres, magnagenre_freqs, magnagenre_childof] = get_magnagenre_numeric(clip_info_magnagenres);
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2 %
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3 % uses the clip_info magnagenres_final db to get a numerical genre
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4 % representation ofthe database
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5 %
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6 % genre_freqs: frequency of genre x in position y
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7 % genre_childof: percentage of genre x being a successor of genre y
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8 %
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9 % reimports the text - based representation of magnatunes and tries to
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10 % determine an underlying structure.
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11 %
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12
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13 data = clip_info_magnagenres(:,3);
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14
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15 % ---
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16 % genre and genre posfrequency list:
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17 % ---
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18
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19 magnagen_id = {};
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20
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21 genres = {};
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22
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23 max_genres = 50;
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24 max_simul_genres = 4;
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25 genre_freqs = [];
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26 genre_childof = [];
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27
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28 % for each of the genre tags
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29 for i = 1:length(data)
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30
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31 % separate genres;
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32 tmp = explode(',', data{i});
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33
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34 % find and save correspnding genre indices
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35 for j = 1:length(tmp)
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36 genidx = strcellfind(genres,tmp(j));
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37
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38 % add genre to genre list if not existent
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39 if genidx < 1
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40 genidx = size(genres, 1) + 1;
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41 genres = cat(1, genres, tmp(j));
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42
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43 genre_freqs(genidx,:) = zeros(1, max_simul_genres);
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44 genre_childof(genidx,:) = zeros(1, max_genres);
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45 end
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46
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47 % ---
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48 % here, we save the index to a new genre structure
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49 % ---
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50 if j == 1
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51 magnagen_id{i} = genidx;
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52 else
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53 magnagen_id{i} = [magnagen_id{i}, genidx];
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54 end
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55 % ---
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56 % further genre statistics, perhaps its a hierarchy
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57 % ---
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58
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59 % save frequency by position
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60 genre_freqs(genidx, j) = genre_freqs(genidx, j) + 1;
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61
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62 % save parent genre if applicable
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63 if j == 1
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64
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65 % remember parent index
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66 paridx = genidx;
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67 else
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68
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69 % count index for this parent
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70 genre_childof(genidx, paridx) = genre_childof(genidx, paridx) + 1;
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71 end
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72 end
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73
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74 % ---
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75 % - save preceeding first genre for this into another table
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76 % ---
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77 end
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78
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79 % ---
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80 % this should output quite generic data, to ease
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81 % comparison with other genre hierarchies.
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82 %
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83 % thus, we set the parental relation relative to overall
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84 % appearance of the child genre
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85 % ---
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86
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87 % remove overlapping columns
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88 idx = find(sum(genre_childof,1) > 0,1, 'last');
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89 idx = max(size(genre_childof,1),idx);
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90
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91 genre_childof = genre_childof(:, 1:idx);
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92
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93 % make values relative to total occurrence of child
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94 for i = 1: size(genre_childof,1)
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95 genre_childof(i, :) = genre_childof(i, :) ./ sum(genre_freqs(i,:));
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96 end
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97
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98 % ---
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99 % reformat genre attribute table as sparse matrix
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100 % ---
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101 clip_magnagenres = sparse(length(magnagen_id),length(genres));
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102 for i = 1:length(magnagen_id)
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103 clip_magnagenres(i,magnagen_id{i}) = 1;
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104 end
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105
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106 magnagenres = genres;
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107 magnagenre_freqs = genre_freqs;
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108 magnagenre_childof = genre_childof;
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