Displaying 20 results from an estimated 8000 matches similar to: "R-alpha: select.frame"
2004 Jul 16
3
sas to r
I would be incredibly grateful to anyone who'll help me translate some
SAS code into R code.
Say for example that I have a dataset named "dat1" that includes five
variables: wshed, site, species, bda, and sla. I can calculate with the
following SAS code the mean, CV, se, and number of observations of
"bda" and "sla" for each combination of
1997 Apr 29
0
R-alpha: frametools v.0.0000001
The following three functions are designed to make manipulation of
dataframes easier. I won't write detailed docs just now, but if you
follow the example below, you should get the general picture. Comments
are welcome, esp. re. naming conventions.
Note that these functions are definitely not portable to S because
they rely on R's scoping rules. Not that difficult to fix, though: The
nm
2005 Apr 27
4
How to add some of data in the first place dataset
Dear R-help,
First I apologize if my question is quite simple.
I need add some of data in the first place my dataset, how can I do that.
I have tried with rbind, but I did not succes.
0.1 3.6 0.4 0.9 rose
4.1 4.0 1.2 1.2 rose
4.4 3.2 1.9 0.5 rose
4.6 1.1 1.1 0.2 rose
For example,
2010 Jun 09
4
question about "mean"
Hi there:
I have a question about generating mean value of a data.frame. Take
iris data for example, if I have a data.frame looking like the following:
---------------------
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4
0.2 setosa
2 4.9 3.0 1.4
0.2
2006 Dec 18
5
Replacing values
Hi all,
I have to recode some values in a dataset. for example changing all zeros to
"." or 999 would be also ok. does anybody know how to do this? thanks in
advance. lars
--
View this message in context: http://www.nabble.com/-R--Replacing-values-tf2841687.html#a7934402
Sent from the R help mailing list archive at Nabble.com.
2009 Oct 17
1
Easy way to `iris[,-"Petal.Length"]' subsetting?
Dear all
What is the easy way to drop a variable by using its name (and not its
number)? Example:
> data(iris)
> head(iris)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4 0.2 setosa
3 4.7 3.2 1.3 0.2 setosa
4 4.6 3.1
2012 Aug 01
3
Neuralnet Error
I require some help in debugging this codeĀ
library(neuralnet)
ir<-read.table(file="iris_data.txt",header=TRUE,row.names=NULL)
ir1 <- data.frame(ir[1:100,2:6])
ir2 <- data.frame(ifelse(ir1$Species=="setosa",1,ifelse(ir1$Species=="versicolor",0,"")))
colnames(ir2)<-("Output")
ir3 <- data.frame(rbind(ir1[1:4],ir2))
2010 Jul 29
1
where did the column names go to?
I've just tried to merge 2 data sets thinking they would only keep the common
columns, but noticed the column count was not adding up. I've then
replicated a simple example and got the same thing happening.
q1. why doesn't 'b' have a column name?
q2. when I merge, why does the new column 'y' have all values as 5.1?
Thanks in advance,
Mr. confused
> a <-
2010 Feb 03
1
Calculating subsets "on the fly" with ddply
Hi,
[I sent this to the plyr mailing list (late) last night, but it seems
to be lost in the moderation queue, so here's a shot to the broadeR
community]
Apologies in advance for being more verbose than necessary, but I'm
not even sure how to ask this question in the context of plyr, so ...
here goes.
As meaningless as this might be to do with the `iris` data, the spirit
of it is what
2006 Jan 02
2
How to create "special" (source) file
Dear All,
I'm a Marine Biologist using R (in a most informal and applied way) for a couple of years. Actually, I've been using R to analyse the results supporting my thesis. I would like to put together (in the same file) the data (.txt files) and the scripts files (.R files) for each chapter. How can I do this?
Thanks in advance, Eduardo Esteves
[[alternative HTML version deleted]]
2012 Jun 11
1
saving sublist lda object with save.image()
Greetings R experts,
I'm having some difficulty recovering lda objects that I've saved within sublists using the save.image() function. I am running a script that exports a variety of different information as a list, included within that list is an lda object. I then take that list and create a list of that with all the different replications I've run. Unfortunately I've been
2009 Sep 09
1
change character to factor in data frame
Dear all
I have a simple problem which I thought is easy to solve but what I tried
did not work. I want to change character variables to factor in data
frame. It goes easily from factor to character, but I am stuck in how to
do backwards conversion.
Here is an example
irisf<-iris
irisf[,2]<-factor(irisf[,2]) # create second factor
str(irisf)
'data.frame': 150 obs. of 5
2013 Jul 22
1
union of a list of logical values
Dear all,
How can I obtain the union of a list of logical values?
Consider the following:
x <- head(iris)
x[,c(2,4)] <- NA
x[c(2,4),] <- NA
# > x
# Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1 5.1 NA 1.4 NA setosa
# 2 NA NA NA NA <NA>
# 3 4.7 NA 1.3
2004 Nov 16
2
changing character to a vector name
Dear R People:
I would like to generate a vector/variable name from within a loop to be
passed to a table
function.
This is what I have so far:
>assign("p1",paste("raw3.df$",rw2$V1[3],sep=""))
>p1
[1] "raw3.df$CITIZEN"
>
Essentially, I want to use the raw3.df$CITIZEN along with another value to
generate a table.
However, I'm stuck here. I
2011 Aug 16
3
Newbie question - struggling with boxplots
Hopefully I will not be flamed for this on the list, but I am starting out
with R and having some trouble with combining plots.
I am playing with the famous iris dataset (checking out example dataset in R
while reading through Introduction to datamining)
What I would like to do is create three graphs (combined boxplots) besides
each other for each of the three species (Setosa, Versicolour and
2012 Oct 10
2
Summary using by() returns character arrays in a list
I use by() to generate a summary statistics like so:
Lbys <- by(dat[Nidx], dat$LipTest, summary)
where Nidx is an index vector with names picking out the columns in the
data frame dat.
This returns a list of character arrays (see below for str() output) where
the columns are named correctly but the rownames are empty strings and the
values are strings prepended with the summary
2011 Aug 10
2
round() a data frame containing 'character' variables?
Dear all
It is difficult to use round(..., digits=2) on a data frame since one
has to first take care to remove non-numeric variables such as
'character' or 'factor':
> head(round(iris, 2))
Error in Math.data.frame(list(Sepal.Length = c(5.1, 4.9, 4.7, 4.6, 5, :
non-numeric variable in data frame: Species
> head(round(iris[1:4], 2))
Sepal.Length Sepal.Width Petal.Length
2008 Aug 07
6
multiple tapply
Hi folk,
I tried this and it works just perfectly
tapply(iris[,1],iris[5],mean)
but, how to obtain a single table from multiple variables?
In tapply x is an atomic object so this code doesn't work
tapply(iris[,1:4],iris[5],mean)
Thanx and great summer holidays
Gianandrea
--
View this message in context: http://www.nabble.com/multiple-tapply-tp18868063p18868063.html
Sent from the R help
2006 Jul 07
1
replace values in data frame
Hi all,
I have a three columned list that I have imported into R. The first column
is a plot (ex. Plot1), the second is a species name (ex ACERRUB) and the
third a numeric value. I want to replace some of the second column names
with other names (for example replace ACERRUB with ACERDRU). The original
and replacement values are in separate lists (not vectors), but I can't seem
to find the
2004 Aug 21
2
more on apply on data frame
Hi R People:
Several of you pointed out that using "tapply" on a data frame will work on
the iris data frame.
I'm still having a problem.
The iris data frame has 150 rows, 5 variables. The first 4 are numeric,
while the last is a factor, which has the Species names.
I can use tapply for 1 variable at a time:
>tapply(iris[,1],iris[,5],mean)
setosa versicolor virginica