1. No comment on original garbled HTML code.
2. Comment on: "... Within your last statement it appears you are
trying to find the sum of a logical vector - is.na(). This is what is
causing the error."
That is false:
> sum(rep(c(FALSE,TRUE),3))
[1] 3
Please do read basic R documents -- this is about automatic coercion
-- before dispensing false advice.
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
Clifford Stoll
On Tue, Nov 11, 2014 at 7:42 AM, Mark Sharp <msh...@txbiomed.org> wrote:
> Aditya,
>
> Please use plan text. HTML is not handled correctly.
>
> Within your last statement it appears you are trying to find the sum of a
> logical vector - is.na(). This is what is causing the error.
>
> My guess is that you want to count the number of elements in the second
> column that are not NA values. You probably want the following for your last
> line. (See ?sum).
>
> nummk <- length(vbm[ !is.na(vbm[ , 2], 2])
> ## or
> nummk <- nrow(vbm[!is.na(vbm[ , 2], ])
>
> ## The is.na(vbm[ ,2]) returns a logical vector (for example c(FALSE, TRUE,
> TRUE))
>
> Mark
>
> R. Mark Sharp, Ph.D.
> Director Primate Records Database
> Southwest National Primate Research Center
> Director of Scientific Computing
> Texas Biomedical Research Institute
> P.O. Box 760549
> San Antonio, TX 78245-0549
> Office telephone: (210)258-9476 (is forwarded to mobile telephone; message
> are captured into e-mail.)
> Mobile telephone: (210) 218-2868
>
>
>
>
> On Nov 11, 2014, at 3:05 AM, Aditya Singh wrote:
>
> setwd("C:/Documents and
> Settings/Administrator/Desktop/Coursera/specdata/specdata")temp=list.files(pattern="*.csv")myfiles=lapply(temp,read.delim)summk=0nummk=0for
> (i in 1:10) { vb=data.frame(myfiles[i]) vbm=as.double(vb)
> summk=sum(vbm[,2]) nummk=length(vbm[,2]) - sum(is.na(vbm[,2]))}
> Aditya
>
> [[alternative HTML version deleted]]
>
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