Calculating bearing in R -

i trying calculate angle between consecutive lat/long locations in r using bearingtrack function argosfilter package. have used distancetrack function package filter need, substituted bearing distance. code have used:

this dput has given me error after applying code below:

dput :

    lizard<-structure(list(longitude = c(139.348233, 139.348208, 139.348093,      139.348085, 139.347863, 139.347893, 139.347903, 139.347918, 139.34784,      139.34773, 139.34753, 139.347453, 139.347288, 139.347308, 139.347307,      139.34733, 139.347332, 139.34733, 139.347312, 139.347317, 139.34731,      139.347293, 139.347312, 139.347297, 139.347332, 139.34731, 139.347308,      139.347337, 139.347308, 139.34731, 139.34731, 139.347307, 139.347312,      139.347325, 139.347332, 139.347327, 139.347325, 139.347338, 139.347348,      139.347315, 139.347305, 139.347337, 139.347355, 139.347338, 139.347322,      139.347327, 139.347363, 139.347343, 139.347722, 139.34774, 139.347723,      139.34773, 139.34787, 139.347957, 139.34795, 139.347825, 139.3478,      139.347773, 139.34791, 139.347847, 139.347817, 139.347822, 139.347775,      139.347785, 139.347778, 139.347827, 139.34779, 139.347742, 139.347848,      139.347845, 139.347847, 139.34786, 139.347853, 139.347848, 139.347823,      139.347843, 139.347838, 139.347825, 139.347842, 139.347848, 139.347837,      139.34783, 139.347847, 139.347805, 139.347838, 139.34782, 139.347855,      139.347858, 139.347832, 139.347822, 139.347857, 139.347852, 139.347845,      139.347847, 139.347848, 139.347843, 139.34788, 139.347795, 139.347848,      139.347808, 139.347825, 139.347852, 139.347863, 139.347858, 139.347837,      139.347847, 139.347853, 139.347813, 139.347843, 139.347863, 139.347812,      139.347853, 139.347862, 139.34789, 139.347897, 139.347848, 139.347858,      139.347845, 139.34786, 139.34786, 139.347847, 139.347833, 139.347868,      139.347865, 139.347837, 139.347873, 139.34785, 139.347867, 139.34787,      139.347913, 139.347897, 139.347855, 139.347858, 139.347843, 139.347852,      139.347857, 139.34783, 139.347837, 139.347812, 139.347775, 139.34784,      139.347837, 139.34785, 139.347722, 139.34776, 139.347692, 139.347735,      139.347697, 139.347708, 139.34773, 139.347745, 139.347685, 139.347755,      139.34767, 139.347747, 139.347748, 139.347725, 139.34774, 139.347728,      139.347722, 139.34772, 139.347708, 139.347722, 139.347728, 139.347715,      139.34771, 139.347688, 139.347707, 139.347727, 139.347743, 139.347737,      139.347743, 139.347732, 139.347732, 139.347767, 139.34773, 139.347748,      139.347733, 139.347718, 139.347707, 139.3477, 139.34771, 139.3477,      139.347697, 139.34857, 139.348607, 139.348642, 139.348595, 139.34861,      139.34859, 139.348607, 139.348633, 139.348607, 139.348623, 139.348603,      139.348658, 139.348622, 139.348612, 139.348582, 139.348578),      latitude = c(-33.90222, -33.902223, -33.902388, -33.902442,  -33.902713, -33.903037, -33.903303, -33.903327, -33.903217,  -33.902997, -33.902807, -33.902367, -33.902305, -33.90231,  -33.902318, -33.902298, -33.90231, -33.902328, -33.902312,  -33.902295, -33.902302, -33.902297, -33.902303, -33.902285,  -33.902305, -33.902277, -33.902303, -33.902315, -33.902305,  -33.902302, -33.902307, -33.902313, -33.902318, -33.902313,  -33.902313, -33.902305, -33.902318, -33.9023, -33.902278,  -33.902298, -33.902327, -33.902307, -33.902277, -33.902283,  -33.902285, -33.902243, -33.902247, -33.902315, -33.903317,  -33.903307, -33.903305, -33.903318, -33.903353, -33.903323,  -33.903185, -33.903087, -33.903093, -33.903078, -33.903047,  -33.903042, -33.903045, -33.903038, -33.903053, -33.903043,  -33.903047, -33.903013, -33.903037, -33.903028, -33.903028,  -33.903142, -33.903145, -33.903127, -33.90315, -33.903137,  -33.90317, -33.903128, -33.903148, -33.903147, -33.903133,  -33.903157, -33.903142, -33.903122, -33.903125, -33.903108,  -33.903117, -33.903102, -33.903127, -33.903135, -33.903147,  -33.903148, -33.90316, -33.903135, -33.903117, -33.903135,  -33.903133, -33.90313, -33.90313, -33.903137, -33.90314,  -33.903157, -33.90311, -33.90314, -33.903135, -33.903137,  -33.903135, -33.903152, -33.903123, -33.903163, -33.903148,  -33.903147, -33.903113, -33.903167, -33.90317, -33.903302,  -33.90333, -33.903188, -33.903152, -33.903155, -33.903147,  -33.903142, -33.903147, -33.903132, -33.903163, -33.903165,  -33.90316, -33.90314, -33.903167, -33.903158, -33.90316,  -33.903138, -33.903158, -33.903128, -33.903135, -33.903125,  -33.903133, -33.90314, -33.903127, -33.903138, -33.903112,  -33.903125, -33.903127, -33.903148, -33.90313, -33.902708,  -33.902713, -33.902712, -33.9027, -33.902687, -33.902698,  -33.902722, -33.902688, -33.90265, -33.902718, -33.902727,  -33.902717, -33.902717, -33.902707, -33.9027, -33.902718,  -33.902762, -33.902702, -33.902713, -33.902685, -33.902697,  -33.902717, -33.902693, -33.902742, -33.902683, -33.902682,  -33.902743, -33.902688, -33.902705, -33.902693, -33.902695,  -33.902672, -33.902687, -33.902668, -33.90269, -33.90272,  -33.902725, -33.902712, -33.902708, -33.90269, -33.902678,  -33.902892, -33.90271, -33.902653, -33.902722, -33.902678,  -33.902738, -33.902722, -33.902708, -33.902742, -33.902703,  -33.902722, -33.902715, -33.902782, -33.902632, -33.902697,  -33.902727), altitude = c(134l, 136l, 132l, 136l, 134l, 132l,  134l, 134l, 134l, 134l, 132l, 130l, 136l, 132l, 136l, 134l,  136l, 132l, 132l, 136l, 136l, 134l, 140l, 136l, 142l, 130l,  136l, 136l, 136l, 132l, 136l, 138l, 134l, 138l, 140l, 142l,  140l, 138l, 140l, 140l, 140l, 138l, 144l, 140l, 138l, 134l,  136l, 138l, 134l, 136l, 134l, 136l, 134l, 138l, 134l, 136l,  136l, 138l, 140l, 136l, 134l, 134l, 130l, 128l, 128l, 134l,  130l, 126l, 132l, 132l, 132l, 132l, 132l, 132l, 142l, 136l,  136l, 136l, 136l, 134l, 134l, 136l, 132l, 134l, 134l, 132l,  142l, 138l, 144l, 142l, 140l, 138l, 138l, 140l, 142l, 140l,  142l, 134l, 138l, 136l, 138l, 134l, 140l, 130l, 128l, 136l,  128l, 130l, 134l, 132l, 126l, 136l, 132l, 136l, 134l, 132l,  132l, 134l, 132l, 132l, 132l, 132l, 134l, 134l, 136l, 134l,  134l, 136l, 142l, 140l, 138l, 130l, 130l, 128l, 128l, 130l,  132l, 128l, 130l, 130l, 132l, 138l, 132l, 134l, 134l, 134l,  140l, 136l, 136l, 142l, 140l, 128l, 144l, 132l, 136l, 132l,  138l, 140l, 138l, 138l, 138l, 138l, 138l, 142l, 138l, 134l,  136l, 132l, 136l, 140l, 136l, 136l, 134l, 134l, 132l, 130l,  128l, 128l, 132l, 126l, 130l, 130l, 128l, 124l, 132l, 130l,  132l, 132l, 128l, 134l, 132l, 136l, 142l, 118l, 124l, 118l,  110l, 114l, 128l, 132l), satellites = c(8l, 8l, 8l, 8l, 8l,  8l, 8l, 8l, 6l, 6l, 6l, 6l, 6l, 7l, 7l, 7l, 7l, 7l, 7l, 7l,  7l, 7l, 7l, 6l, 6l, 6l, 7l, 7l, 7l, 6l, 6l, 6l, 6l, 6l, 6l,  6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 8l, 8l,  8l, 8l, 7l, 7l, 7l, 7l, 6l, 6l, 6l, 8l, 8l, 7l, 6l, 6l, 6l,  6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 7l, 6l, 6l, 6l, 6l, 7l, 7l,  7l, 7l, 7l, 6l, 6l, 6l, 7l, 7l, 6l, 6l, 6l, 6l, 6l, 6l, 6l,  6l, 6l, 6l, 6l, 6l, 6l, 7l, 7l, 7l, 7l, 7l, 7l, 7l, 7l, 6l,  7l, 6l, 6l, 6l, 6l, 6l, 8l, 8l, 8l, 8l, 8l, 8l, 8l, 8l, 7l,  7l, 7l, 6l, 6l, 6l, 8l, 8l, 8l, 8l, 8l, 8l, 8l, 8l, 8l, 8l,  7l, 6l, 6l, 7l, 7l, 7l, 7l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l,  6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 8l, 8l,  8l, 8l, 8l, 7l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 6l, 8l,  8l, 7l, 7l, 8l, 7l, 7l, 8l, 7l, 6l, 6l, 6l, 6l, 6l, 6l, 6l ), hdop = c(1, 1, 0.8, 0.8, 0.8, 0.8, 1, 0.8, 1.6, 1.6, 1.6,  1.6, 1.2, 1.2, 1.2, 1.2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.2,  1, 1, 1, 1, 1, 1, 1, 1.8, 1.8, 1.4, 1.4, 1.4, 1.4, 1.2, 1.2,  1.2, 1.2, 1.4, 1.4, 1.4, 1.4, 1.4, 1.2, 1.2, 1.2, 1.2, 1.2,  1.2, 1.2, 1.2, 1.2, 1.2, 1.2, 1.2, 1.2, 2.2, 2.6, 2.6, 2.4,  2.4, 2.2, 2.2, 2, 1.6, 1.4, 1.4, 1.4, 1, 1, 1.2, 1.2, 1.2,  1, 1, 1, 1, 1, 1.2, 1.2, 1.2, 1.2, 1.2, 1.4, 1.4, 1.4, 1.4,  1.4, 1.4, 1.4, 1.4, 1.4, 1.4, 1.6, 1.8, 2, 1.4, 1.4, 1.4,  1.2, 1.2, 1.2, 1.2, 1.2, 1.4, 1.4, 1.4, 1.4, 1.4, 1.4, 1.4,  0.8, 0.8, 0.8, 0.8, 0.8, 1, 0.8, 0.8, 1, 1, 1, 1.4, 1.4,  1.4, 0.8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.2, 1.2, 1.2, 1.2,  1.4, 1.6, 1.8, 2, 2.4, 2.6, 2.4, 2, 2, 1, 1, 1.4, 1.4, 1.4,  1.4, 1.4, 1.4, 1.4, 1.4, 1.6, 1.6, 1.8, 2, 1.2, 1.4, 1.4,  1.4, 1.4, 2, 1.8, 1.6, 1.4, 1.4, 1.4, 1.4, 1.2, 1.2, 1.4,  1.4, 1.2, 1, 1.6, 1.8, 1, 1.8, 1.8, 1, 1.6, 1.8, 1.8, 1.8,  1.8, 1.6, 1.4, 1.2), datetime = structure(1:200, .label = c("2014/11/08 07:10:00",  "2014/11/08 07:20:00", "2014/11/08 07:30:00", "2014/11/08 07:40:00",  "2014/11/08 07:50:00", "2014/11/08 08:00:00", "2014/11/08 08:10:00",  "2014/11/08 08:20:00", "2014/11/08 08:30:00", "2014/11/08 08:40:00",  "2014/11/08 08:50:00", "2014/11/08 09:00:00", "2014/11/08 17:30:00",  "2014/11/08 18:40:00", "2014/11/08 18:50:00", "2014/11/08 19:00:00",  "2014/11/08 19:10:00", "2014/11/08 19:20:00", "2014/11/08 19:30:00",  "2014/11/08 19:40:00", "2014/11/08 19:50:00", "2014/11/08 20:00:00",  "2014/11/08 20:10:00", "2014/11/08 20:20:00", "2014/11/08 20:30:00",  "2014/11/08 20:40:00", "2014/11/08 21:30:00", "2014/11/08 21:40:00",  "2014/11/08 21:50:00", "2014/11/08 22:00:00", "2014/11/08 22:10:00",  "2014/11/08 22:20:00", "2014/11/08 22:30:00", "2014/11/08 23:30:00",  "2014/11/08 23:40:00", "2014/11/09 02:40:00", "2014/11/09 02:50:00",  "2014/11/09 03:00:00", "2014/11/09 03:10:00", "2014/11/09 03:20:00",  "2014/11/09 03:30:00", "2014/11/09 03:40:00", "2014/11/09 03:50:00",  "2014/11/09 05:30:00", "2014/11/09 05:40:00", "2014/11/09 05:50:00",  "2014/11/09 06:00:00", "2014/11/09 06:10:00", "2014/11/09 08:30:00",  "2014/11/09 08:40:00", "2014/11/09 08:50:00", "2014/11/09 09:00:00",  "2014/11/09 09:10:00", "2014/11/09 09:20:00", "2014/11/09 09:30:00",  "2014/11/09 09:40:00", "2014/11/09 10:30:00", "2014/11/09 10:40:00",  "2014/11/09 10:50:00", "2014/11/09 13:30:00", "2014/11/09 13:40:00",  "2014/11/09 13:50:00", "2014/11/09 14:00:00", "2014/11/09 14:10:00",  "2014/11/09 14:20:00", "2014/11/09 14:30:00", "2014/11/09 14:40:00",  "2014/11/09 14:50:00", "2014/11/09 15:00:00", "2014/11/09 15:40:00",  "2014/11/09 15:50:00", "2014/11/09 16:00:00", "2014/11/09 16:10:00",  "2014/11/09 17:20:00", "2014/11/09 17:30:00", "2014/11/09 17:40:00",  "2014/11/09 17:50:00", "2014/11/09 18:00:00", "2014/11/09 19:30:00",  "2014/11/09 19:40:00", "2014/11/09 19:50:00", "2014/11/09 20:00:00",  "2014/11/09 20:10:00", "2014/11/09 20:20:00", 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12:50:00",  "2014/11/10 13:00:00", "2014/11/10 13:10:00", "2014/11/10 13:20:00",  "2014/11/10 13:30:00", "2014/11/10 13:40:00", "2014/11/10 13:50:00",  "2014/11/10 14:00:00", "2014/11/10 14:10:00", "2014/11/10 14:20:00",  "2014/11/10 14:30:00", "2014/11/10 14:40:00", "2014/11/10 14:50:00",  "2014/11/10 15:00:00", "2014/11/10 15:10:00", "2014/11/10 15:20:00",  "2014/11/10 15:30:00", "2014/11/10 19:30:00", "2014/11/10 19:40:00",  "2014/11/10 19:50:00", "2014/11/10 20:00:00", "2014/11/10 20:10:00",  "2014/11/10 20:20:00", "2014/11/10 20:30:00", "2014/11/10 20:40:00",  "2014/11/10 20:50:00", "2014/11/10 21:00:00", "2014/11/10 21:10:00",  "2014/11/10 22:10:00", "2014/11/10 22:20:00", "2014/11/11 00:50:00",  "2014/11/11 01:00:00", "2014/11/11 01:10:00", "2014/11/11 01:20:00",  "2014/11/11 02:30:00", "2014/11/11 02:40:00", "2014/11/11 02:50:00",  "2014/11/11 03:00:00", "2014/11/11 03:10:00", "2014/11/11 03:20:00",  "2014/11/11 03:30:00", "2014/11/11 03:40:00", "2014/11/11 05:30:00",  "2014/11/11 05:40:00", "2014/11/11 05:50:00", "2014/11/11 06:00:00",  "2014/11/11 06:10:00", "2014/11/11 06:20:00", "2014/11/11 06:30:00",  "2014/11/11 06:40:00", "2014/11/11 06:50:00", "2014/11/11 07:00:00",  "2014/11/11 07:10:00", "2014/11/11 07:20:00", "2014/11/11 07:30:00",  "2014/11/11 07:40:00", "2014/11/11 07:50:00", "2014/11/11 08:00:00",  "2014/11/11 09:30:00", "2014/11/11 09:40:00", "2014/11/11 10:00:00",  "2014/11/11 10:10:00", "2014/11/11 10:20:00", "2014/11/11 10:30:00",  "2014/11/11 10:40:00", "2014/11/11 10:50:00", "2014/11/11 11:00:00",  "2014/11/11 11:20:00", "2014/11/11 11:30:00", "2014/11/11 11:40:00",  "2014/11/11 12:00:00", "2014/11/11 14:50:00", "2014/11/11 19:10:00",  "2014/11/11 19:20:00", "2014/11/11 19:30:00", "2014/11/11 20:00:00",  "2014/11/11 23:20:00", "2014/11/12 02:30:00", "2014/11/12 02:40:00",  "2014/11/12 04:20:00", "2014/11/12 04:30:00", "2014/11/12 04:40:00",  "2014/11/12 04:50:00", "2014/11/12 05:00:00", "2014/11/12 05:10:00",  "2014/11/12 05:20:00", "2014/11/12 08:10:00", "2014/11/12 10:50:00",  "2014/11/12 11:00:00", "2014/11/12 11:10:00", "2014/11/12 11:20:00",  "2014/11/12 13:40:00", "2014/11/12 13:50:00", "2014/11/12 14:00:00",  "2014/11/12 14:10:00", "2014/11/12 20:30:00", "2014/11/12 20:40:00",  "2014/11/12 20:50:00", "2014/11/12 21:00:00", "2014/11/12 21:10:00",  "2014/11/12 22:00:00", "2014/11/12 22:10:00", "2014/11/12 23:00:00",  "2014/11/12 23:10:00", "2014/11/12 23:20:00", "2014/11/12 23:30:00",  "2014/11/12 23:40:00", "2014/11/12 23:50:00", "2014/11/13 00:00:00",  "2014/11/13 00:10:00", "2014/11/13 00:20:00", "2014/11/13 00:30:00",  "2014/11/13 01:30:00", "2014/11/13 01:40:00", "2014/11/13 01:50:00",  "2014/11/13 02:00:00", "2014/11/13 02:10:00", "2014/11/13 02:30:00",  "2014/11/13 02:40:00", "2014/11/13 02:50:00", "2014/11/13 03:00:00",  "2014/11/13 03:10:00", "2014/11/13 03:20:00", "2014/11/13 03:30:00",  "2014/11/13 05:30:00", "2014/11/13 05:40:00", "2014/11/13 05:50:00",  "2014/11/13 06:00:00", "2014/11/13 06:10:00", "2014/11/13 06:20:00",  "2014/11/13 06:30:00", "2014/11/13 06:40:00", "2014/11/13 06:50:00",  "2014/11/13 07:00:00", "2014/11/13 07:10:00", "2014/11/13 07:40:00",  "2014/11/13 07:50:00", "2014/11/13 08:20:00", "2014/11/13 09:20:00",  "2014/11/14 08:50:00", "2014/11/14 09:00:00", "2014/11/14 09:10:00",  "2014/11/14 09:20:00", "2014/11/14 10:30:00", "2014/11/14 12:10:00",  "2014/11/14 12:20:00", "2014/11/14 12:30:00", "2014/11/14 12:40:00",  "2014/11/14 12:50:00", "2014/11/14 13:00:00", "2014/11/14 13:10:00",  "2014/11/14 13:20:00", "2014/11/14 13:30:00", "2014/11/14 13:40:00",  "2014/11/14 13:50:00", "2014/11/14 14:00:00", "2014/11/14 14:10:00",  "2014/11/14 14:20:00", "2014/11/14 23:00:00", "2014/11/14 23:10:00",  "2014/11/15 01:30:00", "2014/11/15 01:40:00", "2014/11/15 01:50:00",  "2014/11/15 02:00:00", "2014/11/15 02:10:00", "2014/11/15 02:20:00",  "2014/11/15 02:30:00", "2014/11/15 02:40:00", "2014/11/15 02:50:00",  "2014/11/15 03:10:00", "2014/11/15 03:20:00", "2014/11/15 05:30:00",  "2014/11/15 05:40:00", "2014/11/15 05:50:00", "2014/11/15 06:00:00",  "2014/11/15 06:10:00", "2014/11/15 06:20:00", "2014/11/15 06:30:00",  "2014/11/15 06:40:00", "2014/11/15 06:50:00", "2014/11/15 07:00:00",  "2014/11/15 07:10:00", "2014/11/15 07:20:00", "2014/11/15 07:30:00",  "2014/11/15 07:40:00", "2014/11/15 07:50:00", "2014/11/15 09:20:00",  "2014/11/15 09:30:00", "2014/11/15 09:40:00", "2014/11/15 09:50:00",  "2014/11/15 10:00:00", "2014/11/15 10:10:00", "2014/11/15 11:30:00",  "2014/11/15 11:40:00", "2014/11/15 11:50:00", "2014/11/15 12:00:00",  "2014/11/15 12:10:00", "2014/11/15 12:20:00", "2014/11/15 12:30:00",  "2014/11/15 12:40:00", "2014/11/15 12:50:00", "2014/11/15 13:00:00",  "2014/11/15 13:10:00", "2014/11/15 15:30:00", "2014/11/15 15:40:00",  "2014/11/15 15:50:00", "2014/11/15 16:00:00", "2014/11/15 16:10:00",  "2014/11/15 16:20:00", "2014/11/15 16:30:00", "2014/11/15 16:40:00",  "2014/11/15 16:50:00", "2014/11/15 17:50:00", "2014/11/15 21:30:00",  "2014/11/15 21:40:00", "2014/11/15 21:50:00", "2014/11/15 22:00:00",  "2014/11/15 23:00:00", "2014/11/15 23:10:00"), class = "factor"),  speedfilter = structure(c(1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l), .label = "not", class =            "factor")), .names = c("longitude",       "latitude", "altitude", "satellites", "hdop", "datetime", "speedfilter"      ), row.names = c(na, 200l), class = "data.frame") 

code :

#install.packages("argosfilter") library(argosfilter)  lizard$datetime <- as.posixct(lizard$datetime) lizard$angle <- na  lizard$angle[2:nrow(lizard)] <- bearingtrack(lizard$lat, lizard$lon) lizard$iscontiguous <- true  lizard$iscontiguous[2:nrow(lizard)] <-       (as.numeric(lizard$datetime[2:nrow(lizard)] - lizard$datetime[1:nrow(lizard) - 1]) == 10) lizard <- lizard[lizard$iscontiguous, ]  

for of data has worked no problems data following error:

error in if (bearing > 180) bearing = bearing - 360 : missing value true/false needed

i not r might simple problem fix suggestions on how fix great.

it appears running problems duplicated values longitude , latitude. seems working now. these results want?

lizard$datetime <- as.posixct(lizard$datetime)  #remove duplicates longitude , latitude columns  lizard <- lizard[!duplicated(lizard[c("longitude", "latitude")]),]  lizard$angle[2:nrow(lizard)] <- bearingtrack(lizard$latitude, lizard$longitude) lizard$iscontiguous <- true  lizard$iscontiguous[2:nrow(lizard)] <-       (as.numeric(lizard$datetime[2:nrow(lizard)] - lizard$datetime[1:nrow(lizard) - 1]) == 10) lizard <- lizard[lizard$iscontiguous, ]  

results

   longitude  latitude altitude satellites hdop            datetime speedfilter      angle iscontiguous 1   139.3482 -33.90222      134          8  1.0 2014-11-08 07:10:00         not         na         true 2   139.3482 -33.90222      136          8  1.0 2014-11-08 07:20:00         not  -98.23378         true 3   139.3481 -33.90239      132          8  0.8 2014-11-08 07:30:00         not -149.95233         true 4   139.3481 -33.90244      136          8  0.8 2014-11-08 07:40:00         not -172.92556         true 5   139.3479 -33.90271      134          8  0.8 2014-11-08 07:50:00         not -145.78766         true 6   139.3479 -33.90304      132          8  0.8 2014-11-08 08:00:00         not  175.60411         true 7   139.3479 -33.90330      134          8  1.0 2014-11-08 08:10:00         not  178.22120         true 8   139.3479 -33.90333      134          8  0.8 2014-11-08 08:20:00         not  152.57339         true 9   139.3478 -33.90322      134          6  1.6 2014-11-08 08:30:00         not  -30.47532         true 10  139.3477 -33.90300      134          6  1.6 2014-11-08 08:40:00         not  -22.53824         true