[R-sig-eco] adehabitatLT merge different bursts for same ID

[g.cerritelli]

Dear list,

I'm trying to simulate the migratory movement of an animal, following 
the work of Bunnefeld et al 2011.
I started from a dataset of dates and used the function simm.mou and 
simm.bb in adehabitatLT to simulate five distinct movement types: the 
stay in a wintering area, the migration to reproductive areas, the stay 
in this sites, the return migration and finally the stay in wintering 
areas.
Now I would like to merge this five simulations into one and so obtain a 
single object ltraj with all the information on the whole movement. For 
this purpose, I assigned to the five simulation the same ID but 
different burst and than used the string c() to put all the simulations 
in one object ltraj. However the five bursts remained separated.
Does anyone know how can I actually merge in adehabitatLT this tracks to 
be one?


da = as.POSIXct(strptime(as.character(data$timestamp), 
tz="",format="%d/%m/%Y %H:%M:%S"))
da[1:10]
  [1] "2014-04-29 00:00:00 CEST" "2014-04-29 00:19:00 CEST"
  [3] "2014-04-29 00:37:00 CEST" "2014-04-29 00:55:00 CEST"
  [5] "2014-04-29 01:14:00 CEST" "2014-04-29 01:32:00 CEST"
  [7] "2014-04-29 01:51:00 CEST" "2014-04-29 02:09:00 CEST"
  [9] "2014-04-29 02:27:00 CEST" "2014-04-29 02:46:00 CEST"


hr<-simm.mou(da[1:70],b = c(0, 
0),a=diag(c(0.001,0.001)),sigma=diag(c(100,100)),
              x0 = c(0, 0),id = "Prova", burst = "HR1")
bb<-simm.bb(da[71:110], 
begin=c(0,0),end=c(60000,60000),id="Prova",burst="migr")
hr2<-simm.mou(da[111:210],b = c(60000, 
60000),a=diag(c(0.001,0.001)),sigma=diag(c(100,100)),
               x0 = c(60000, 60000),id = "Prova",burst="HR2")
bb2<-simm.bb(da[211:240], 
begin=c(60000,60000),end=c(0,0),id="Prova",burst="migr2")
hr3<-simm.mou(da[241:350],b = c(0, 
0),a=diag(c(0.001,0.001)),sigma=diag(c(100,100)),
              x0 = c(0, 0),id = "Prova", burst = "HR3")
migr<- c(hr,bb,hr2,bb2,hr3)

ld(migr)
           x         y                date        dx        dy      dist  
  dt
68   1273.749  7132.147 2014-04-29 20:31:00 -4814.308 -9767.770 
10889.761 1080
69  -3540.560 -2635.623 2014-04-29 20:49:00 -2708.557 -1208.668  
2966.001 1140
70  -6249.117 -3844.291 2014-04-29 21:08:00        NA        NA        
NA   NA
111     0.000     0.000 2014-04-29 21:26:00  1444.220  1450.462  
2046.854 1080
210  1444.220  1450.462 2014-04-29 21:44:00  1545.417  1533.493  
2177.134 1140
310  2989.636  2983.956 2014-04-29 22:03:00  1505.393  1525.449  
2143.176 1080

         R2n  abs.angle     rel.angle    id burst                      
pkey
68  52489961 -2.0287292 -3.1366093166 Prova   HR1 Prova.2014-04-29 
20:31:00
69  19482070 -2.7218694 -0.6931401962 Prova   HR1 Prova.2014-04-29 
20:49:00
70  53830039         NA            NA Prova   HR1 Prova.2014-04-29 
21:08:00
111        0  0.7875548            NA Prova  migr Prova.2014-04-29 
21:26:00
210  4189611  0.7815256 -0.0060292387 Prova  migr Prova.2014-04-29 
21:44:00
310 17841916  0.7920154  0.0104897686 Prova  migr Prova.2014-04-29 
22:03:00


Thank you in advance for your time.

Giulia