> dput(head(userdata[,1:5]))
structure(list(user = structure(1:6, .Label = c("user0001", "user0002",
"user0003", "user0004", "user0005", "user0006", "user0007", "user0008",
"user0009", "user0010", "user0011", "user0012", "user0013", "user0014",
"user0015", "user0016", "user0017", "user0018", "user0019", "user0020",
"user0021", "user0022", "user0023", "user0024", "user0025", "user0026",
"user0027", "user0028", "user0029", "user0030", "user0031", "user0032",
"user0033", "user0034", "user0035", "user0036", "user0037", "user0038",
"user0039", "user0040", "user0041", "user0042", "user0043", "user0044",
"user0045", "user0046", "user0047", "user0048", "user0049", "user0050",
"user0051", "user0052", "user0053", "user0054", "user0055", "user0056",
"user0057", "user0058", "user0059", "user0060", "user0061", "user0062",
"user0063", "user0064", "user0065", "user0066", "user0067", "user0068",
"user0069", "user0070", "user0071", "user0072", "user0073", "user0074",
"user0075", "user0076", "user0077", "user0078", "user0079", "user0080",
"user0081", "user0082", "user0083", "user0084", "user0085", "user0086",
"user0087", "user0088", "user0089", "user0090", "user0091", "user0092",
"user0093", "user0094", "user0095", "user0096", "user0097", "user0098",
"user0099", "user0100", "user0101", "user0102", "user0103", "user0104",
"user0105", "user0106", "user0107", "user0108", "user0109", "user0110",
"user0111", "user0112", "user0113", "user0114", "user0115", "user0116",
"user0117", "user0118", "user0119", "user0120", "user0121", "user0122",
"user0123", "user0124", "user0125", "user0126", "user0127", "user0128",
"user0129", "user0130", "user0131", "user0132", "user0133", "user0134",
"user0135", "user0136", "user0137", "user0138", "user0139", "user0140",
"user0141", "user0142", "user0143", "user0144", "user0145", "user0146",
"user0147", "user0148", "user0149", "user0150", "user0151", "user0152",
"user0153", "user0154", "user0155", "user0156", "user0157", "user0158",
"user0159", "user0160", "user0161", "user0162", "user0163", "user0164",
"user0165", "user0166", "user0167", "user0168", "user0169", "user0170",
"user0171", "user0172", "user0173", "user0174", "user0175", "user0176",
"user0177", "user0178", "user0179", "user0180", "user0181", "user0182",
"user0183", "user0184", "user0185", "user0186", "user0187", "user0188",
"user0189", "user0190", "user0191", "user0192", "user0193", "user0194",
"user0195", "user0196", "user0197", "user0198", "user0199", "user0200",
"user0201", "user0202", "user0203", "user0204", "user0205", "user0206",
"user0207", "user0208", "user0209", "user0210", "user0211", "user0212",
"user0213", "user0214", "user0215", "user0216", "user0217", "user0218",
"user0219", "user0220", "user0221", "user0222", "user0223", "user0224",
"user0225", "user0226", "user0227", "user0228", "user0229", "user0230",
"user0231", "user0232", "user0233", "user0234", "user0235", "user0236",
"user0237", "user0238", "user0239", "user0240", "user0241", "user0242",
"user0243", "user0244", "user0245", "user0246", "user0247", "user0248",
"user0249", "user0250", "user0251", "user0252", "user0253", "user0254",
"user0255", "user0256", "user0257", "user0258", "user0259", "user0260",
"user0261", "user0262", "user0263", "user0264", "user0265", "user0266",
"user0267", "user0268", "user0269", "user0270", "user0271", "user0272",
"user0273", "user0274", "user0275", "user0276", "user0277", "user0278",
"user0279", "user0280", "user0281", "user0282", "user0283", "user0284",
"user0285", "user0286", "user0287", "user0288", "user0289", "user0290",
"user0291", "user0292", "user0293", "user0294", "user0295", "user0296",
"user0297", "user0298", "user0299", "user0300", "user0301", "user0302",
"user0303", "user0304", "user0305", "user0306", "user0307", "user0308",
"user0309", "user0310", "user0311", "user0312", "user0313", "user0314",
"user0315", "user0316", "user0317", "user0318", "user0319", "user0320",
"user0321", "user0322", "user0323", "user0324", "user0325", "user0326",
"user0327", "user0328", "user0329", "user0330", "user0331", "user0332",
"user0333", "user0334", "user0335", "user0336", "user0337", "user0338",
"user0339", "user0340", "user0341", "user0342", "user0343", "user0344",
"user0345", "user0346", "user0347", "user0348", "user0349", "user0350",
"user0351", "user0352", "user0353", "user0354", "user0355", "user0356",
"user0357", "user0358", "user0359", "user0360", "user0361", "user0362",
"user0363", "user0364", "user0365", "user0366", "user0367", "user0368",
"user0369", "user0370", "user0371", "user0372", "user0373", "user0374",
"user0375", "user0376", "user0377", "user0378", "user0379", "user0380",
"user0381", "user0382", "user0383", "user0384", "user0385", "user0386",
"user0387", "user0388", "user0389", "user0390", "user0391", "user0392",
"user0393", "user0394", "user0395", "user0396", "user0397", "user0398",
"user0399", "user0400", "user0401", "user0402", "user0403", "user0404",
"user0405", "user0406", "user0407", "user0408", "user0409", "user0410",
"user0411", "user0412", "user0413", "user0414", "user0415", "user0416",
"user0417", "user0418", "user0419", "user0420", "user0421", "user0422",
"user0423", "user0424", "user0425", "user0426", "user0427", "user0428",
"user0429", "user0430", "user0431", "user0432", "user0433", "user0434",
"user0435", "user0436", "user0437", "user0438", "user0439", "user0440",
"user0441", "user0442", "user0443", "user0444", "user0445", "user0446",
"user0447", "user0448", "user0449", "user0450", "user0451", "user0452",
"user0453", "user0454", "user0455", "user0456", "user0457", "user0458",
"user0459", "user0460", "user0461", "user0462", "user0463", "user0464",
"user0465", "user0466", "user0467", "user0468", "user0469", "user0470",
"user0471", "user0472", "user0473", "user0474", "user0475", "user0476",
"user0477", "user0478", "user0479", "user0480", "user0481", "user0482",
"user0483", "user0484", "user0485", "user0486", "user0487", "user0488",
"user0489", "user0490", "user0491", "user0492", "user0493", "user0494",
"user0495", "user0496", "user0497", "user0498", "user0499", "user0500",
"user0501", "user0502", "user0503", "user0504", "user0505", "user0506",
"user0507", "user0508", "user0509", "user0510", "user0511", "user0512",
"user0513", "user0514", "user0515", "user0516", "user0517", "user0518",
"user0519", "user0520", "user0521", "user0522", "user0523", "user0524",
"user0525", "user0526", "user0527", "user0528", "user0529", "user0530",
"user0531", "user0532", "user0533", "user0534", "user0535", "user0536",
"user0537", "user0538", "user0539", "user0540", "user0541", "user0542",
"user0543", "user0544", "user0545", "user0546", "user0547", "user0548",
"user0549", "user0550", "user0551", "user0552", "user0553", "user0554",
"user0555", "user0556", "user0557", "user0558", "user0559", "user0560",
"user0561", "user0562", "user0563", "user0564", "user0565", "user0566",
"user0567", "user0568", "user0569", "user0570", "user0571", "user0572",
"user0573", "user0574", "user0575", "user0576", "user0577", "user0578",
"user0579", "user0580", "user0581", "user0582", "user0583", "user0584",
"user0585", "user0586", "user0587", "user0588", "user0589", "user0590",
"user0591", "user0592", "user0593", "user0594", "user0595", "user0596",
"user0597", "user0598", "user0599", "user0600"), class = "factor"),
    Daft.Punk = c(29L, 0L, 0L, 0L, 0L, 0L), The.National = c(0L,
    0L, 0L, 0L, 0L, 0L), Vampire.Weekend = c(0L, 126L, 0L, 0L,
    0L, 0L), Lana.Del.Rey = c(0L, 0L, 0L, 0L, 0L, 0L)), .Names = c("user",
"Daft.Punk", "The.National", "Vampire.Weekend", "Lana.Del.Rey"
), row.names = c(NA, 6L), class = "data.frame")