Re: [R] rowVars

2006-04-04 Thread Brahm, David 
I've written a rowVars function, but I don't think it throws the error
you mention.  You're welcome to use it if you like.

rowVars <- function(x, na.rm=FALSE, dims=1, unbiased=TRUE,
SumSquares=FALSE, twopass=FALSE) {
  if (SumSquares) return(rowSums(x^2, na.rm, dims))
  N <- rowSums(!is.na(x), FALSE, dims)
  Nm1 <- if (unbiased) N-1 else N
  if (twopass) {x <- if (dims==0) x - mean(x, na.rm=na.rm) else
 sweep(x, 1:dims, rowMeans(x,na.rm,dims))}
  (rowSums(x^2, na.rm, dims) - rowSums(x, na.rm, dims)^2/N) / Nm1
}

-- David Brahm ([EMAIL PROTECTED]) 


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of r user
Sent: Friday, March 31, 2006 1:40 PM
To: rhelp
Subject: [R] rowVars

I am using the R 2.2.1 in a Windows XP environment.

I have a dataframe with 12 columns and 1,000 rows.
(Some of the rows have 1 or fewer values.)

I am trying to use rowVars to calculate the variance
of each row.

I am getting the following message:
"Error in na.remove.default(x) : length of 'dimnames'
[1] not equal to array extent"


Is there a good work-around?

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Re: [R] rowVars

2006-04-01 Thread Uwe Ligges 
r user wrote:

> I am using the R 2.2.1 in a Windows XP environment.
> 
> I have a dataframe with 12 columns and 1,000 rows.
> (Some of the rows have 1 or fewer values.)

fewer than 1? So you mean 0?
Well, the commonly used estimator for the variance is defined for n>=2 
elements only!


> I am trying to use rowVars to calculate the variance
> of each row.

I don't know a function rowVars in R-2.2.1 - and cannot find it ...

> I am getting the following message:
> “Error in na.remove.default(x) : length of 'dimnames'
> [1] not equal to array extent”

Hard to tell without knowing what you actually did.

Uwe Ligges


> 
> Is there a good work-around?
> 
> __
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

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[R] rowVars

2006-03-31 Thread r user 
I am using the R 2.2.1 in a Windows XP environment.

I have a dataframe with 12 columns and 1,000 rows.
(Some of the rows have 1 or fewer values.)

I am trying to use rowVars to calculate the variance
of each row.

I am getting the following message:
“Error in na.remove.default(x) : length of 'dimnames'
[1] not equal to array extent”


Is there a good work-around?

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html