[R-sig-eco] FPT and Adehabitat
Mathieu Basille
basille at biomserv.univ-lyon1.fr
Thu Apr 22 23:11:01 CEST 2010
Dear Samantha,
Maybe I did not understand correctly your question, but here is an
additional comment to Clément's answer: setNA does not interpolate the
coordinates of the missing relocations. Thus, you can't possibly
retrieve them afterwards, if this is what you wanted.
Cheers,
Mathieu.
Clément Calenge a écrit :
> Samantha Patrick wrote:
>> I'm sorry I think I worded my question badly- I know how to plot the
>> NAs but not how to export a text file of their location or position in
>> the trajectory. I have checked the help but cannot find anything.
>>
> Not sure to understand... an object of class ltraj is a list with one
> data.frame per burst (see the help page of as.ltraj). You can therefore
> get the first burst by:
>
> yaya3[[1]]
>
> Each row corresponds to one relocation (missing or not). The rows are
> ordered according to their timing.
> You can export this data.frame to a text file using write.table.
> Best regards,
>
> Clément
>
>
>> Thank you again for helping!
>>
>> Dr Samantha Patrick
>> EU INTERREG Post Doc
>> Marine Biology & Ecology Research Centre
>> University of Plymouth
>> Plymouth
>> PL4 8AA
>>
>> T: 01752 584699
>> M: 07740472719
>>
>>
>> -----Original Message-----
>> From: Clément Calenge [mailto:clement.calenge at oncfs.gouv.fr]
>> Sent: 21 April 2010 14:25
>> To: Samantha Patrick
>> Cc: r-sig-ecology at r-project.org
>> Subject: Re: [R-sig-eco] FPT and Adehabitat
>>
>> Samantha Patrick wrote:
>>
>>> Thank you so much - you have been a huge help. I have followed you
>>> recommendation and now I have my trajectories sampled at an equal
>>> time period and the missing values entered as NAs. To continue with
>>> my analysis I have been trying to find a way to output the object of
>>> class ltraj (in this case yaya3) so I can see where R has placed the
>>> NAs and the corresponding co-ordinates of points with FP values (to
>>> allow spatial analysis). However I can only find a function to plot
>>> the positions of NAs - the final hurdle!
>>>
>>>
>> see the help page of plotNAltraj.
>> Best regards,
>>
>> Clément Calenge
>>
>>
>>
>>> Many Thanks again
>>>
>>> Sam
>>>
>>>
>>> Dr Samantha Patrick
>>> EU INTERREG Post Doc
>>> Marine Biology & Ecology Research Centre
>>> University of Plymouth
>>> Plymouth
>>> PL4 8AA
>>>
>>> T: 01752 584699
>>> M: 07740472719
>>>
>>>
>>> -----Original Message-----
>>> From: Clément Calenge [mailto:clement.calenge at oncfs.gouv.fr]
>>> Sent: 21 April 2010 12:12
>>> To: Samantha Patrick
>>> Cc: r-sig-ecology at r-project.org
>>> Subject: Re: [R-sig-eco] FPT and Adehabitat
>>>
>>> Samantha Patrick wrote:
>>>
>>>
>>>> The data set is pasted at the bottom of the email and this is the
>>>> code I am using (excluding data read):
>>>>
>>>> ddate <-as.POSIXct(datetime)
>>>> burst<-as.factor(FPT[,6])
>>>> id<-as.factor(FPT[,6])
>>>> xy<-data.frame (FPT[,7], FPT[,8])
>>>> yaya<-as.ltraj(xy,ddate,id, burst, typeII = TRUE, slsp = c("remove",
>>>> "missing"))
>>>> summary.ltraj(yaya)
>>>> ayayGPS <- redisltraj(yaya, 500)
>>>>
>>>> fptshort=fpt(ayayGPS, seq(5000,30000, length=6))
>>>>
>>>> I am wondering if the outputs are for the redistributed locations?
>>>> If this is the case, is there any way to get FPT for raw locations
>>>> (I want to compare the results with other measures of sinuosity
>>>> etc.)? The timing of bursts is not constant though...
>>>>
>>
>>
>>>>
>>> Actually, when you use redisltraj, you redicretize your trajectory so
>>> that the step length is constant (you fix it to 500 metres). Your
>>> original dataset has 139 relocations, but when you rediscretize the
>>> trajectory, you increase the number of relocations. Indeed, have a look
>>> at the contents of ayayGPS:
>>>
>>> > ayayGPS
>>>
>>> *********** List of class ltraj ***********
>>>
>>> Type of the traject: Type II (time recorded)
>>> Irregular traject. Variable time lag between two locs
>>>
>>> Characteristics of the bursts:
>>> id burst nb.reloc NAs date.begin date.end
>>> 1 6.2 6.2.R500 295 0 2006-06-21 15:09:48 2006-06-21 21:16:01
>>>
>>> There are 295 relocations in your new trajectory. This explains why the
>>> fpt returns a data frame with 295 data points. Now the question is: why
>>> do you rediscretize the trajectory? You note that "The timing of bursts
>>> is not constant". This is expected: the function redisltraj does not
>>> transform an irregular trajectory into a regular one (the help page of
>>> this function indicates that it is used for "Rediscretization of a
>>> Trajectory With Regular Step Length").
>>>
>>> Looking at the time lag between successive relocations:
>>>
>>> plotltr(yaya,"dt/60")
>>>
>>> it appears that a relocation was collected approximately every 2 min...
>>> and that there are missing values. Two points are important here:
>>>
>>> * there should be missing values in the trajectory at several places.
>>> Therefore the function setNA may be useful here to fill in these NAs
>>> (have a look at the help page of the function setNA):
>>>
>>> yaya2 <- setNA(yaya, as.POSIXct("2010-01-01"), 2, units="min")
>>>
>>> have a look at yaya2:
>>>
>>> > yaya2
>>>
>>> *********** List of class ltraj ***********
>>>
>>> Type of the traject: Type II (time recorded)
>>> Irregular traject. Variable time lag between two locs
>>>
>>> Characteristics of the bursts:
>>> id burst nb.reloc NAs date.begin date.end
>>> 1 6.2 6.2 195 56 2006-06-21 15:09:48 2006-06-21 21:37:55
>>>
>>> The number of relocations have increased (there are now 195 relocations,
>>> because 56 are missing)
>>>
>>> * the timings are only approximate. We can "round" the timing to make
>>> the trajectory exactly regular (see the help page of sett0):
>>>
>>> yaya3 <- sett0(yaya2, as.POSIXct("2010-01-01"), 2, units="min")
>>>
>>> yaya3 is now exactly regular:
>>>
>>> > yaya3
>>>
>>> *********** List of class ltraj ***********
>>>
>>> Type of the traject: Type II (time recorded)
>>> Regular traject. Time lag between two locs: 120 seconds
>>>
>>> Characteristics of the bursts:
>>> id burst nb.reloc NAs date.begin date.end
>>> 1 6.2 6.2 195 56 2006-06-21 15:10:00 2006-06-21 21:38:00
>>>
>>> the time lag between relocations is now constant. This dataset yaya3
>>> contains only the original relocations (with rounded timings) + missing
>>> values.
>>> **But note that the step length is no longer constant** (but why do you
>>> need constant step length in FPT analysis?). Finally use the function
>>> fpt:
>>>
>>> fptshort <- fpt(yaya3, seq(5000,30000, length=6))
>>>
>>> Hope this helps
>>>
>>> Clément Calenge.
>>>
>>>
>>>
>>>> Many thanks for your help
>>>>
>>>> Best Wishes
>>>>
>>>> Sam
>>>>
>>>>
>>>> dddate tttime Lat Lon ID Burst xx yy
>>>> 2006-06-21 15:09:48 -5.48138 51.73081
>>>> 6.2 6.2 742965.87000 5736959.30000
>>>> 2006-06-21 15:12:01 -5.48146 51.73082
>>>> 6.2 6.2 742960.28000 5736960.50000
>>>> 2006-06-21 15:14:58 -5.48583 51.72864
>>>> 6.2 6.2 742670.66000 5736703.30000
>>>> 2006-06-21 15:17:24 -5.48699 51.72929
>>>> 6.2 6.2 742586.76000 5736771.50000
>>>> 2006-06-21 15:20:30 -5.49569 51.73421
>>>> 6.2 6.2 741960.22000 5737289.50000
>>>> 2006-06-21 15:22:43 -5.51323 51.73561
>>>> 6.2 6.2 740742.05000 5737387.10000
>>>> 2006-06-21 15:24:56 -5.52846 51.74312
>>>> 6.2 6.2 739650.90000 5738172.20000
>>>> 2006-06-21 15:27:18 -5.54604 51.74984
>>>> 6.2 6.2 738402.38000 5738861.10000
>>>> 2006-06-21 15:29:36 -5.56479 51.75534
>>>> 6.2 6.2 737079.38000 5739411.70000
>>>> 2006-06-21 15:31:55 -5.58231 51.76059
>>>> 6.2 6.2 735843.10000 5739938.30000
>>>> 2006-06-21 15:34:31 -5.60271 51.76500
>>>> 6.2 6.2 734413.21000 5740363.20000
>>>> 2006-06-21 15:37:07 -5.62265 51.76815
>>>> 6.2 6.2 733021.53000 5740648.70000
>>>> 2006-06-21 15:39:26 -5.64052 51.77049
>>>> 6.2 6.2 731776.44000 5740852.10000
>>>> 2006-06-21 15:42:20 -5.66318 51.77429
>>>> 6.2 6.2 730194.48000 5741203.40000
>>>> 2006-06-21 15:44:42 -5.68139 51.78069
>>>> 6.2 6.2 728906.38000 5741857.50000
>>>> 2006-06-21 15:46:55 -5.69897 51.78288
>>>> 6.2 6.2 727682.52000 5742045.20000
>>>> 2006-06-21 15:49:13 -5.71702 51.78535
>>>> 6.2 6.2 726426.04000 5742264.20000
>>>> 2006-06-21 15:52:13 -5.74030 51.79218
>>>> 6.2 6.2 724786.32000 5742950.60000
>>>> 2006-06-21 15:54:37 -5.75805 51.79961
>>>> 6.2 6.2 723526.28000 5743722.30000
>>>> 2006-06-21 15:57:25 -5.78056 51.80464
>>>> 6.2 6.2 721949.58000 5744212.70000
>>>> 2006-06-21 15:59:37 -5.78381 51.80597
>>>> 6.2 6.2 721719.39000 5744350.60000
>>>> 2006-06-21 16:01:48 -5.78273 51.80650
>>>> 6.2 6.2 721790.85000 5744413.50000
>>>> 2006-06-21 16:04:06 -5.78262 51.80813
>>>> 6.2 6.2 721790.77000 5744595.10000
>>>> 2006-06-21 16:06:19 -5.78165 51.80903
>>>> 6.2 6.2 721852.86000 5744698.10000
>>>> 2006-06-21 16:08:31 -5.78108 51.81042
>>>> 6.2 6.2 721885.22000 5744853.70000
>>>> 2006-06-21 16:11:07 -5.78012 51.81167
>>>> 6.2 6.2 721945.56000 5744996.10000
>>>> 2006-06-21 16:13:31 -5.78455 51.81492
>>>> 6.2 6.2 721624.44000 5745343.80000
>>>> 2006-06-21 16:15:42 -5.80296 51.82131
>>>> 6.2 6.2 720324.79000 5745997.80000
>>>> 2006-06-21 16:18:00 -5.82177 51.82815
>>>> 6.2 6.2 718995.58000 5746702.40000
>>>> 2006-06-21 16:20:25 -5.84190 51.83592
>>>> 6.2 6.2 717570.85000 5747505.00000
>>>> 2006-06-21 16:22:42 -5.86282 51.83992
>>>> 6.2 6.2 716111.21000 5747888.20000
>>>> 2006-06-21 16:25:02 -5.88449 51.84056
>>>> 6.2 6.2 714615.50000 5747895.30000
>>>> 2006-06-21 16:27:25 -5.90739 51.84269
>>>> 6.2 6.2 713028.46000 5748064.10000
>>>> 2006-06-21 16:29:37 -5.92828 51.84313
>>>> 6.2 6.2 711587.50000 5748052.60000
>>>> 2006-06-21 16:32:01 -5.95060 51.84389
>>>> 6.2 6.2 710047.08000 5748072.50000
>>>> 2006-06-21 16:56:55 -6.17119 51.87331
>>>> 6.2 6.2 694728.69000 5750729.80000
>>>> 2006-06-21 16:59:07 -6.18950 51.87581
>>>> 6.2 6.2 693457.32000 5750959.20000
>>>> 2006-06-21 17:01:18 -6.20822 51.87589
>>>> 6.2 6.2 692168.53000 5750918.60000
>>>> 2006-06-21 17:03:31 -6.22717 51.87621
>>>> 6.2 6.2 690863.23000 5750904.90000
>>>> 2006-06-21 17:05:57 -6.24819 51.87824
>>>> 6.2 6.2 689408.33000 5751075.00000
>>>> 2006-06-21 17:08:06 -6.26652 51.88070
>>>> 6.2 6.2 688136.15000 5751301.30000
>>>> 2006-06-21 17:10:24 -6.28705 51.88118
>>>> 6.2 6.2 686721.86000 5751302.10000
>>>> 2006-06-21 17:30:53 -6.45187 51.88101
>>>> 6.2 6.2 675380.21000 5750873.30000
>>>> 2006-06-21 17:33:01 -6.45097 51.88106
>>>> 6.2 6.2 675441.74000 5750880.30000
>>>> 2006-06-21 17:35:12 -6.45016 51.88134
>>>> 6.2 6.2 675496.73000 5750913.60000
>>>> 2006-06-21 17:37:36 -6.44931 51.88168
>>>> 6.2 6.2 675554.00000 5750953.90000
>>>> 2006-06-21 17:40:01 -6.45036 51.88182
>>>> 6.2 6.2 675481.09000 5750966.70000
>>>> 2006-06-21 17:42:25 -6.46744 51.87689
>>>> 6.2 6.2 674324.60000 5750376.90000
>>>> 2006-06-21 17:47:04 -6.47118 51.86575
>>>> 6.2 6.2 674110.57000 5749129.60000
>>>> 2006-06-21 17:49:42 -6.47089 51.85771
>>>> 6.2 6.2 674161.22000 5748236.80000
>>>> 2006-06-21 17:52:00 -6.47270 51.86890
>>>> 6.2 6.2 673993.44000 5749475.90000
>>>> 2006-06-21 17:54:15 -6.48392 51.87681
>>>> 6.2 6.2 673191.15000 5750328.90000
>>>> 2006-06-21 17:57:24 -6.48532 51.88458
>>>> 6.2 6.2 673064.58000 5751190.20000
>>>> 2006-06-21 17:59:38 -6.48502 51.88476
>>>> 6.2 6.2 673084.53000 5751210.90000
>>>> 2006-06-21 18:01:48 -6.48431 51.88493
>>>> 6.2 6.2 673132.65000 5751230.60000
>>>> 2006-06-21 18:04:00 -6.48373 51.88517
>>>> 6.2 6.2 673172.08000 5751259.30000
>>>> 2006-06-21 18:06:37 -6.48307 51.88531
>>>> 6.2 6.2 673216.72000 5751276.60000
>>>> 2006-06-21 18:08:48 -6.48249 51.88548
>>>> 6.2 6.2 673255.87000 5751296.70000
>>>> 2006-06-21 18:11:37 -6.48168 51.88556
>>>> 6.2 6.2 673311.19000 5751307.30000
>>>> 2006-06-21 18:13:48 -6.48085 51.88569
>>>> 6.2 6.2 673368.13000 5751324.30000
>>>> 2006-06-21 18:16:36 -6.48000 51.88609
>>>> 6.2 6.2 673425.07000 5751370.80000
>>>> 2006-06-21 18:18:48 -6.47963 51.88632
>>>> 6.2 6.2 673449.43000 5751396.90000
>>>> 2006-06-21 18:21:37 -6.47898 51.88742
>>>> 6.2 6.2 673489.80000 5751521.00000
>>>> 2006-06-21 18:24:42 -6.47843 51.88777
>>>> 6.2 6.2 673526.54000 5751560.80000
>>>> 2006-06-21 18:27:44 -6.47785 51.88806
>>>> 6.2 6.2 673565.54000 5751595.00000
>>>> 2006-06-21 18:31:54 -6.47595 51.88390
>>>> 6.2 6.2 673711.97000 5751136.90000
>>>> 2006-06-21 18:34:13 -6.47883 51.88695
>>>> 6.2 6.2 673501.81000 5751469.10000
>>>> 2006-06-21 18:36:43 -6.48925 51.89100
>>>> 6.2 6.2 672769.77000 5751894.20000
>>>> 2006-06-21 18:39:07 -6.48853 51.89066
>>>> 6.2 6.2 672820.50000 5751858.10000
>>>> 2006-06-21 18:41:24 -6.48806 51.89093
>>>> 6.2 6.2 672851.47000 5751888.90000
>>>> 2006-06-21 18:43:43 -6.48760 51.89111
>>>> 6.2 6.2 672882.66000 5751910.00000
>>>> 2006-06-21 18:46:14 -6.50280 51.89640
>>>> 6.2 6.2 671816.44000 5752462.80000
>>>> 2006-06-21 18:48:24 -6.51535 51.90130
>>>> 6.2 6.2 670934.59000 5752978.30000
>>>> 2006-06-21 18:50:43 -6.53180 51.90659
>>>> 6.2 6.2 669783.44000 5753528.10000
>>>> 2006-06-21 18:52:54 -6.54770 51.91159
>>>> 6.2 6.2 668670.70000 5754046.20000
>>>> 2006-06-21 18:55:07 -6.56365 51.91854
>>>> 6.2 6.2 667548.36000 5754782.80000
>>>> 2006-06-21 18:57:43 -6.58125 51.92617
>>>> 6.2 6.2 666310.08000 5755590.80000
>>>> 2006-06-21 19:00:19 -6.59594 51.92229
>>>> 6.2 6.2 665313.97000 5755125.60000
>>>> 2006-06-21 19:03:32 -6.61737 51.92219
>>>> 6.2 6.2 663841.38000 5755066.00000
>>>> 2006-06-21 19:06:07 -6.63860 51.92683
>>>> 6.2 6.2 662364.38000 5755534.10000
>>>> 2006-06-21 19:08:50 -6.65449 51.93002
>>>> 6.2 6.2 661260.75000 5755853.80000
>>>> 2006-06-21 19:11:00 -6.66988 51.92770
>>>> 6.2 6.2 660211.40000 5755561.50000
>>>> 2006-06-21 19:19:55 -6.73595 51.92041
>>>> 6.2 6.2 655694.34000 5754607.40000
>>>> 2006-06-21 19:22:07 -6.75289 51.92037
>>>> 6.2 6.2 654529.67000 5754567.40000
>>>> 2006-06-21 19:24:18 -6.76489 51.91180
>>>> 6.2 6.2 653733.38000 5753589.00000
>>>> 2006-06-21 19:26:49 -6.77896 51.91149
>>>> 6.2 6.2 652767.36000 5753525.10000
>>>> 2006-06-21 19:29:00 -6.79281 51.91160
>>>> 6.2 6.2 651814.25000 5753508.20000
>>>> 2006-06-21 19:31:49 -6.80859 51.90841
>>>> 6.2 6.2 650739.36000 5753120.10000
>>>> 2006-06-21 19:34:13 -6.81951 51.90515
>>>> 6.2 6.2 649999.50000 5752735.00000
>>>> 2006-06-21 19:37:31 -6.83476 51.90308
>>>> 6.2 6.2 648957.17000 5752473.50000
>>>> 2006-06-21 19:39:55 -6.84750 51.90275
>>>> 6.2 6.2 648081.77000 5752411.50000
>>>> 2006-06-21 19:42:22 -6.86246 51.90572
>>>> 6.2 6.2 647043.59000 5752711.30000
>>>> 2006-06-21 19:44:32 -6.87491 51.90647
>>>> 6.2 6.2 646184.81000 5752769.00000
>>>> 2006-06-21 19:47:01 -6.88648 51.89641
>>>> 6.2 6.2 645421.25000 5751627.70000
>>>> 2006-06-21 19:51:26 -6.89770 51.89913
>>>> 6.2 6.2 644640.49000 5751907.60000
>>>> 2006-06-21 19:53:36 -6.90755 51.90497
>>>> 6.2 6.2 643943.96000 5752537.70000
>>>> 2006-06-21 19:55:50 -6.92119 51.90624
>>>> 6.2 6.2 643001.95000 5752651.50000
>>>> 2006-06-21 19:58:00 -6.93272 51.90531
>>>> 6.2 6.2 642212.04000 5752525.70000
>>>> 2006-06-21 20:00:14 -6.94620 51.91235
>>>> 6.2 6.2 641262.59000 5753283.00000
>>>> 2006-06-21 20:02:31 -6.95391 51.92287
>>>> 6.2 6.2 640699.10000 5754437.90000
>>>> 2006-06-21 20:04:55 -6.96821 51.92892
>>>> 6.2 6.2 639697.30000 5755083.10000
>>>> 2006-06-21 20:07:07 -6.98130 51.93282
>>>> 6.2 6.2 638785.69000 5755491.50000
>>>> 2006-06-21 20:09:19 -6.99558 51.93392
>>>> 6.2 6.2 637800.23000 5755586.10000
>>>> 2006-06-21 20:11:30 -7.00972 51.93806
>>>> 6.2 6.2 636815.72000 5756020.60000
>>>> 2006-06-21 20:13:43 -7.02412 51.94170
>>>> 6.2 6.2 635814.93000 5756398.40000
>>>> 2006-06-21 20:15:56 -7.03805 51.94504
>>>> 6.2 6.2 634847.64000 5756743.40000
>>>> 2006-06-21 20:18:19 -7.05357 51.94017
>>>> 6.2 6.2 633795.50000 5756173.70000
>>>> 2006-06-21 20:20:49 -7.07035 51.93468
>>>> 6.2 6.2 632658.47000 5755532.50000
>>>> 2006-06-21 20:23:19 -7.08226 51.93128
>>>> 6.2 6.2 631849.87000 5755132.10000
>>>> 2006-06-21 20:25:31 -7.09397 51.93145
>>>> 6.2 6.2 631044.01000 5755129.70000
>>>> 2006-06-21 20:27:49 -7.10594 51.93418
>>>> 6.2 6.2 630213.31000 5755412.60000
>>>> 2006-06-21 20:30:07 -7.11838 51.93647
>>>> 6.2 6.2 629351.69000 5755644.60000
>>>> 2006-06-21 20:32:20 -7.13231 51.93359
>>>> 6.2 6.2 628402.16000 5755299.60000
>>>> 2006-06-21 20:34:43 -7.14559 51.92439
>>>> 6.2 6.2 627515.21000 5754252.80000
>>>> 2006-06-21 20:37:01 -7.15992 51.91804
>>>> 6.2 6.2 626547.66000 5753521.60000
>>>> 2006-06-21 20:39:20 -7.17634 51.91853
>>>> 6.2 6.2 625417.35000 5753548.20000
>>>> 2006-06-21 20:41:30 -7.19056 51.91872
>>>> 6.2 6.2 624438.97000 5753544.40000
>>>> 2006-06-21 20:43:49 -7.20412 51.91658
>>>> 6.2 6.2 623512.48000 5753283.70000
>>>> 2006-06-21 20:46:07 -7.21879 51.91735
>>>> 6.2 6.2 622501.41000 5753344.50000
>>>> 2006-06-21 20:48:19 -7.23236 51.91628
>>>> 6.2 6.2 621571.44000 5753203.20000
>>>> 2006-06-21 20:50:37 -7.24680 51.91654
>>>> 6.2 6.2 620577.46000 5753208.20000
>>>> 2006-06-21 20:52:48 -7.26108 51.91442
>>>> 6.2 6.2 619601.28000 5752948.50000
>>>> 2006-06-21 20:55:01 -7.27334 51.91375
>>>> 6.2 6.2 618759.89000 5752853.70000
>>>> 2006-06-21 20:57:14 -7.28510 51.91937
>>>> 6.2 6.2 617936.13000 5753459.80000
>>>> 2006-06-21 20:59:25 -7.29653 51.92360
>>>> 6.2 6.2 617138.78000 5753911.50000
>>>> 2006-06-21 21:01:36 -7.30587 51.92531
>>>> 6.2 6.2 616492.58000 5754087.30000
>>>> 2006-06-21 21:03:56 -7.32102 51.92161
>>>> 6.2 6.2 615459.95000 5753651.10000
>>>> 2006-06-21 21:06:06 -7.33423 51.92266
>>>> 6.2 6.2 614549.49000 5753746.70000
>>>> 2006-06-21 21:08:18 -7.34527 51.92961
>>>> 6.2 6.2 613772.55000 5754502.50000
>>>> 2006-06-21 21:10:37 -7.36041 51.93295
>>>> 6.2 6.2 612723.16000 5754850.90000
>>>> 2006-06-21 21:16:36 -7.40056 51.94133
>>>> 6.2 6.2 609942.27000 5755721.40000
>>>> 2006-06-21 21:18:49 -7.40028 51.94125
>>>> 6.2 6.2 609962.29000 5755712.40000
>>>> 2006-06-21 21:21:01 -7.40044 51.94117
>>>> 6.2 6.2 609951.37000 5755703.60000
>>>> 2006-06-21 21:23:25 -7.40046 51.94107
>>>> 6.2 6.2 609949.79000 5755692.10000
>>>> 2006-06-21 21:25:37 -7.40008 51.94118
>>>> 6.2 6.2 609976.09000 5755705.00000
>>>> 2006-06-21 21:27:55 -7.40016 51.94100
>>>> 6.2 6.2 609971.02000 5755685.30000
>>>> 2006-06-21 21:31:25 -7.40075 51.94086
>>>> 6.2 6.2 609930.70000 5755669.00000
>>>> 2006-06-21 21:34:33 -7.40036 51.94086
>>>> 6.2 6.2 609957.63000 5755668.90000
>>>> 2006-06-21 21:37:55 -7.40036 51.94075
>>>> 6.2 6.2 609957.56000 5755656.40000
>>>>
>>>> Dr Samantha Patrick
>>>> EU INTERREG Post Doc
>>>> Marine Biology & Ecology Research Centre
>>>> University of Plymouth
>>>> Plymouth
>>>> PL4 8AA
>>>>
>>>> T: 01752 584699
>>>> M: 07740472719
>>>>
>>>> -----Original Message-----
>>>> From: Clément Calenge [mailto:clement.calenge at oncfs.gouv.fr]
>>>> Sent: 21 April 2010 11:18
>>>> To: Samantha Patrick
>>>> Cc: r-sig-ecology at r-project.org
>>>> Subject: Re: [R-sig-eco] FPT and Adehabitat
>>>>
>>>> Hard to say without any reproducible example... could you post an
>>>> example (minimum dataset + R code)?
>>>> Best regards,
>>>>
>>>> Clément Calenge
>>>>
>>>> Samantha Patrick wrote:
>>>>
>>>>
>>>>
>>>>> I am calculating First Passage Time for GPS movements. The code
>>>>> all runs fine and R recognises that an individual, for example, has
>>>>> 139 relocations. However when I then view the FPT output there are
>>>>> 295 data points. I have checked back and the data file, the
>>>>> imported data and the number of time points all equal 139. In the
>>>>> help it says that the FPT output is a data frame per individual
>>>>> with a row for each relocation so I cannot understand why it is
>>>>> outputting so many rows. This happens for many individuals but
>>>>> there doesn't not seem to be any pattern in the number of output
>>>>> rows and occurs if I run individuals separately. Has anyone ever
>>>>> come across this or have any ideas?
>>>>>
>>>>> Many Thanks
>>>>>
>>>>> Sam
>>>>>
>>>>>
>>>>> Dr Samantha Patrick
>>>>> EU INTERREG Post Doc
>>>>> Marine Biology & Ecology Research Centre
>>>>> University of Plymouth
>>>>> Plymouth
>>>>> PL4 8AA
>>>>>
>>>>> T: 01752 584699
>>>>> M: 07740472719
>>>>>
>>>>>
>>>>> [[alternative HTML version deleted]]
>>>>>
>>>>> _______________________________________________
>>>>> R-sig-ecology mailing list
>>>>> R-sig-ecology at r-project.org
>>>>> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>> --
>>> Clément CALENGE
>>> Cellule d'appui à l'analyse de données
>>> Office national de la chasse et de la faune sauvage
>>> Saint Benoist - 78610 Auffargis
>>> tel. (33) 01.30.46.54.14
>>>
>>>
>>>
>>>
>>
>>
>> --
>> Clément CALENGE
>> Cellule d'appui à l'analyse de données
>> Office national de la chasse et de la faune sauvage
>> Saint Benoist - 78610 Auffargis
>> tel. (33) 01.30.46.54.14
>>
>>
>>
>
>
--
~$ whoami
Mathieu Basille, Post-Doc
~$ locate
Laboratoire d'Écologie Comportementale et de Conservation de la Faune
+ Centre d'Étude de la Forêt
Département de Biologie
Université Laval, Québec
~$ info
http://ase-research.org/basille
~$ fortune
``If you can't win by reason, go for volume.''
Calvin, by Bill Watterson.
More information about the R-sig-ecology
mailing list