Hello, I created a simple histogram with: myHist<-hist(myData) the object myHist now has two arrays (among the others): myHist$mids myHist$counts Since myHist$counts contains some "0", and I want to calculate the linear fit among myHist$mids and log(myHist$counts), I want remove the elements of both arrays where these "0" occurs. which are the possible solutions to this problem? (I'd like to avoid getting the indexes...) Thanks a lot, copex --------------------------------- [[alternative HTML version deleted]]
You can create a new data frame and subset it: myHist.df <- data.frame(counts = myHist$counts, mids = myHist$mids ) myHist.df <- subset( myHist, counts > 0 ) lm( mids ~ log(counts), data = myHist.df ) --- Date: Mon, 23 Feb 2004 18:40:22 +0100 (CET) From: =?iso-8859-1?q?Fulvio=20Copex?= <copellifulvio at yahoo.it> To: <r-help at stat.math.ethz.ch> Subject: [R] deleting elements from an array/object Hello, I created a simple histogram with: myHist<-hist(myData) the object myHist now has two arrays (among the others): myHist$mids myHist$counts Since myHist$counts contains some "0", and I want to calculate the linear fit among myHist$mids and log(myHist$counts), I want remove the elements of both arrays where these "0" occurs. which are the possible solutions to this problem? (I'd like to avoid getting the indexes...) Thanks a lot, copex
It would be better to have a data frame for this purpose, so
myHist2 <- as.data.frame(myhist[c("counts", mids")])
myHist2 <- myHist2[myHist2$counts > 0, ]
lm(log(counts) ~ mids, data=myHist2)
should set this up for you, or even you could use
myHist2 <- as.data.frame(myhist[c("counts", mids")])
lm(log(counts) ~ mids, data=myHist2, subset=counts > 0)
On Mon, 23 Feb 2004, Fulvio Copex wrote:
> Hello,
> I created a simple histogram with:
> myHist<-hist(myData)
> the object myHist now has two arrays (among the others):
vectors not arrays, I believe.
> myHist$mids
> myHist$counts
> Since myHist$counts contains some "0", and I want to calculate
the
> linear fit among myHist$mids and log(myHist$counts), I want remove the
> elements of both arrays where these "0" occurs.
>
> which are the possible solutions to this problem?
> (I'd like to avoid getting the indexes...)
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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