[R] Math.factor error message

Hichem Ben Khedhiri bk.hichem at googlemail.com
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"


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