[R] Math.factor error message

Tue Feb 16 20:25:27 CET 2010

Dear R-helpers,

I am using a vrtest on time series data. My commands are as follows;

read.table("B.txt",sep="\t",fill=TRUE, na.strings = "NA")

require(vrtest)

rm(list=ls(all=TRUE))

datamat <- read.table("B.txt",sep="\t",fill=TRUE, na.strings = "NA")

column <- 1

nob <- nrow(datamat)

y <- log(datamat[2:nob,column])-log(datamat[1:(nob-1),column])

After, the use of last command, I get the following message;

in Math.factor(c(37L, 36L, 42L, 41L, 44L, 38L, 31L, 61L, 66L, 91L,  :

  log not meaningful for factors

My data is composed of one column.

I would appreciate, if any one could provide me with some hints to get
around the problem.

Best regards,

Ben
-------------- next part --------------
BNS CER
"11,14"
"11,11"
"11,25"
"11,22"
"11,31"
"11,15"
"11,00"
"11,88"
"11,94"
"12,44"
"12,90"
"12,94"
"12,97"
"12,80"
"12,78"
"13,14"
"13,72"
"13,12"
"12,93"
"12,62"
"12,62"
"12,22"
"12,30"
"12,12"
"12,16"
"11,89"
"12,30"
"12,37"
"12,50"
"12,50"
"12,41"
"12,72"
"12,54"
"12,44"
"12,73"
"12,94"
"13,04"
"13,16"
"13,60"
"13,58"
"13,65"
"13,67"
"13,80"
"13,87"
"13,33"
"13,32"
"13,42"
"13,51"
"13,63"
"13,90"
"13,68"
"13,57"
"13,43"
"13,61"
"13,84"
"13,48"
"13,39"
"12,83"
"12,54"
"12,59"
"12,57"
"12,15"
"11,93"
"11,98"
"12,09"
"11,91"
"12,27"
"12,12"
"12,00"
"12,35"
"12,69"
"12,83"
"12,59"
"12,64"
"12,88"
"12,90"
"12,37"
"12,97"
"13,37"
"13,41"
"13,56"
"13,59"
"13,52"
"13,53"
"13,33"
"13,22"
"13,36"
"13,43"
"13,40"
"13,45"
"13,43"
"13,36"
"13,38"
"13,27"
"13,10"
"13,02"
"12,81"
"12,70"
"12,69"
"12,66"
"12,60"
"12,64"
"12,67"
"12,67"
"12,69"
"12,81"
"12,67"
"12,36"
"12,40"
"12,39"
"12,64"
"12,87"
"12,85"
"12,85"
"12,87"
"12,92"
"12,90"
"12,88"
"13,01"
"12,70"
"12,32"
"12,53"
"12,19"
"11,98"
"11,94"
"12,00"
"11,80"
"11,92"
"11,88"
"12,00"
"11,80"
"12,09"
"11,80"
"11,82"
"11,65"
"11,42"
"11,16"
"11,40"
"11,03"
"11,04"
"11,10"
"10,61"
"11,10"
"11,50"
"11,45"
"11,35"
"11,50"
"12,03"
"12,20"
"12,13"
"12,65"
"12,79"
"12,52"
"12,79"
"12,79"
"12,56"
"12,58"
"12,33"
"12,10"
"12,55"
"12,00"
"11,74"
"11,76"
"11,85"
"12,03"
"12,27"
"12,81"
"12,47"
"12,06"
"11,92"
"11,59"
"11,80"
"11,47"
"11,59"
"11,50"
"11,61"
"11,63"
"11,35"
"11,14"
"11,00"
"10,88"
"11,00"
"11,01"
"10,90"
"10,89"
"10,74"
"10,45"
"10,30"
"10,56"
"10,85"
"10,60"
"10,83"
"10,45"
"10,29"
"10,30"
"9,75"
"9,55"
"10,23"
"10,72"
"10,22"
"10,77"
"11,25"
"11,74"
"11,43"
"11,20"
"10,83"
"10,78"
"11,00"
"10,63"
"10,15"
"10,80"
"10,78"
"10,16"
"9,45"
"9,50"
"9,91"
"9,25"
"8,68"
"8,94"
"9,30"
"9,75"
"9,10"
"8,28"
"7,95"
"8,26"
"7,60"
"7,96"
"8,78"
"9,64"
"9,60"
"9,61"
"9,76"
"10,00"
"10,34"
"10,60"
"10,54"
"10,61"
"10,53"
"10,73"
"10,43"
"10,63"
"10,51"
"10,39"
"10,46"
"11,30"
"12,21"
"12,06"
"12,33"
"12,58"
"12,68"
"12,80"
"13,53"
"13,55"
"13,30"
"13,25"
"13,53"
"13,40"
"13,06"
"13,01"
"12,83"
"12,91"
"13,07"
"13,09"
"13,90"
"13,43"
"13,61"
"13,22"
"13,36"
"13,23"
"13,38"
"13,28"
"13,18"
"13,90"
"14,31"
"14,34"
"14,58"
"14,08"
"14,45"
"14,18"
"14,15"
"14,35"
"13,90"
"13,66"
"15,13"
"15,15"
"15,55"
"15,89"
"16,08"
"15,74"
"15,63"
"15,69"
"15,66"
"15,28"
"15,22"
"15,44"
"15,08"
"15,02"
"15,23"
"15,50"
"15,25"
"15,17"
"16,20"
"16,95"
"16,65"
"18,05"
"18,65"
"18,93"
"18,98"
"19,85"
"20,26"
"19,65"
"19,08"
"19,78"
"18,83"
"18,55"
"18,38"
"18,80"
"19,57"
"18,88"
"18,65"
"18,88"
"19,83"
"19,43"
"19,56"
"20,15"
"20,18"
"20,18"
"19,25"
"18,98"
"18,90"
"19,10"
"19,59"
"18,83"
"18,85"
"19,13"
"20,05"
"20,31"
"20,65"
"20,25"
"20,45"
"20,80"
"20,90"
"20,63"
"20,65"
"20,30"
"20,10"
"20,05"
"20,25"
"20,00"
"19,98"
"19,90"
"19,60"
"19,74"
"19,83"