Hi,
I'm writting to this list as I'm puzzled about the behaviour of
read.table(). It is hard to believe that there is a bug in this utils'
function, but for my:
R version 2.12.0 alpha (2010-09-28 r53056)
I'm using scan and read.table to read a number of files, which are as:
---
Project: Murta Sonda
Program: GrafNav Version 8.30.1007
Profile: javier
Source: GPS Epochs(Combined)
ProcessInfo: Run (1) by Unknown on 11/04/2010 at 19:05:17
Datum: WGS84, (processing datum)
Master 1: Name LaMurta, Status ENABLED
Antenna height 2.066 m, to L1-PC (NOV702GG, MeasDist 1.980 m
to mark/ARP)
Position 37 49 38.15069, -1 12 27.55445, 368.197 m (WGS84,
Ellipsoidal hgt)
Remote: Antenna height 1.781 m, to L1-PC (NOV702GG, MeasDist 1.695 m
to mark/ARP)
UTC Offset: 15 s
Local time: +2.0 h, CEST [Central European Savings Time]
Geoid: EGM2008-World.wpg (Absolute correction)
Latitude Longitude LonTextLoTextLongitudTextL
LatTextLaTextLatitudeTextL H-Ell H-MSL LocalUTCDa
LocalUTC
(Deg) (Deg) (DeMi (Sec) (DeMi (Sec) (m)
(m) (DMY) (HMS)
37.8275120694 -1.2077972583 001º12'28.07013"W 037º49'39.04345"N
368.998 318.059 25/10/2010 16:59:00
37.8275121083 -1.2077974806 001º12'28.07093"W 037º49'39.04359"N
368.994 318.055 25/10/2010 16:59:15
37.8275118539 -1.2077974338 001º12'28.07076"W 037º49'39.04267"N
368.997 318.058 25/10/2010 16:59:30
37.8275119923 -1.2077974626 001º12'28.07087"W 037º49'39.04317"N
368.998 318.060 25/10/2010 16:59:45
37.8275323099 -1.2078075891 001º12'28.10732"W 037º49'39.11632"N
368.869 317.930 25/10/2010 17:00:00
37.8275323374 -1.2078077002 001º12'28.10772"W 037º49'39.11641"N
368.866 317.927 25/10/2010 17:00:15
37.8275325076 -1.2078075314 001º12'28.10711"W 037º49'39.11703"N
368.859 317.920 25/10/2010 17:00:30
37.8275325306 -1.2078075056 001º12'28.10702"W 037º49'39.11711"N
368.861 317.922 25/10/2010 17:00:45
37.8275323639 -1.2078075917 001º12'28.10733"W 037º49'39.11651"N
368.853 317.914 25/10/2010 17:01:00
37.8275326222 -1.2078076861 001º12'28.10767"W 037º49'39.11744"N
368.857 317.918 25/10/2010 17:01:15
---
with a number of different records for each file.
To read the data I'm using:
---
dat.names <- scan(file.path("path_and_filename"),
what="character",
skip = 16, nlines=1)
if(length(dat.names) != 8){
stop("Input file seems to be wrong!")}
dat <- read.table(file.path("path_and_filename),
header=FALSE, col.names=dat.names,
skip = 18, as.is=TRUE, blank.lines.skip=FALSE)
---
and systematically, I'm obtaining a number of repeated records at the
starting of the input table (6 in this example). It is easily seen by
looking at the field "LocalUTC":
> dat
Latitude Longitude LonTextLoTextLongitudTextL
LatTextLaTextLatitudeTextL H.Ell H.MSL LocalUTCDa LocalUTC
1 37.82753 -1.207808 001º12'28.10732"W
037º49'39.11632"N 368.869 317.930 25/10/2010 17:00:00
2 37.82753 -1.207808 001º12'28.10772"W
037º49'39.11641"N 368.866 317.927 25/10/2010 17:00:15
3 37.82753 -1.207808 001º12'28.10711"W
037º49'39.11703"N 368.859 317.920 25/10/2010 17:00:30
4 37.82753 -1.207808 001º12'28.10702"W
037º49'39.11711"N 368.861 317.922 25/10/2010 17:00:45
5 37.82753 -1.207808 001º12'28.10733"W
037º49'39.11651"N 368.853 317.914 25/10/2010 17:01:00
6 37.82753 -1.207808 001º12'28.10767"W
037º49'39.11744"N 368.857 317.918 25/10/2010 17:01:15
7 37.82751 -1.207797 001º12'28.07013"W
037º49'39.04345"N 368.998 318.059 25/10/2010 16:59:00
8 37.82751 -1.207797 001º12'28.07093"W
037º49'39.04359"N 368.994 318.055 25/10/2010 16:59:15
9 37.82751 -1.207797 001º12'28.07076"W
037º49'39.04267"N 368.997 318.058 25/10/2010 16:59:30
10 37.82751 -1.207797 001º12'28.07087"W
037º49'39.04317"N 368.998 318.060 25/10/2010 16:59:45
11 37.82753 -1.207808 001º12'28.10732"W
037º49'39.11632"N 368.869 317.930 25/10/2010 17:00:00
12 37.82753 -1.207808 001º12'28.10772"W
037º49'39.11641"N 368.866 317.927 25/10/2010 17:00:15
13 37.82753 -1.207808 001º12'28.10711"W
037º49'39.11703"N 368.859 317.920 25/10/2010 17:00:30
14 37.82753 -1.207808 001º12'28.10702"W
037º49'39.11711"N 368.861 317.922 25/10/2010 17:00:45
15 37.82753 -1.207808 001º12'28.10733"W
037º49'39.11651"N 368.853 317.914 25/10/2010 17:01:00
16 37.82753 -1.207808 001º12'28.10767"W
037º49'39.11744"N 368.857 317.918 25/10/2010 17:01:15
Thanks,
Javier
---
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