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Hichem Ben Khedhiri

2010-Feb-16 19:25 UTC

[R] Math.factor error message

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"

David Winsemius

2010-Feb-16 21:40 UTC

head link

[R] Math.factor error message

On Feb 16, 2010, at 2:25 PM, Hichem Ben Khedhiri wrote:
> 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.
It appears that you may need to apply as.numeric(as.character( )) to  
that column after input (See the FAQ if you don't know why you need  
both functions.) You seem to have created a factor in datamat. You can  
prevent factor-formation with stringsAsFactors or colClasses arguments  
to read.table.

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

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

R help - Feb 2010 - Math.factor error message

[R] Math.factor error message

[R] Math.factor error message

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