Displaying 20 results from an estimated 4000 matches similar to: "Trivial error in documentation"
2007 Sep 16
1
Identifying objects from a data set
Hello
Given the following data for a data set called airquality. To identify the nature of the objects from the data set airquality example "Ozone" would it be best to use the command is. like is.character(airquality$Ozone) ....... I tried attributes(airquality$Ozone) but it came up null. Would there be a better way to identify these objects.
Thanking you in advance for your
2005 Jul 01
2
Simple indexing conundrum
My apologies in advance for my thickness but I can't seem to solve the
following, seemingly simple, data manipulation problem:
I have a data frame that contains multiple factors and multiple
continuous response variables, but duplicates of some factor
combinations. The duplicates contain bad data, so I would like to
eliminate the duplicates. I would like to retain the entire rows
2013 Jan 16
4
Changing frequency values to 1 and 0
Dear list,
I'm working with a large data set, where I grouped several species in one
group (guild). Then I reshaped my data as shown below. Now, I just want to
have "Rep" only as 1 or 0.
I'm not being able to change the values of rep>=1 to 1... tried many things
and I'm not being successful!
> melting=melt(occ.data,id.var=c("guild", "Site",
2008 Dec 23
3
Using transform to add a date column to a dataframe
I would like to add a column to the airquality dataset that contains the date
1950-01-01 in each row. This method does not appear to work:
> attach(airquality)
> data1 <- transform(airquality,Date=as.Date("1950-01-01"))
Error in data.frame(list(Ozone = c(41L, 36L, 12L, 18L, NA, 28L, 23L, 19L, :
arguments imply differing number of rows: 153, 1
I can't decipher what
2008 May 05
4
Column renaming
Dear all,
Is there a less cumbersome way to rename a column by name (as opposed
to index) than --
names( X)[ names[ X] == "bob"]<-"sue"
?
A semi-related question: how does one get the index of a column by
name, something along the lines of col.index( X, "sue") ?
Chip Barnaby
---------------------------------------------------------
Chip Barnaby
2013 Nov 08
3
Date handling in R is hard to understand
Dear All,
I usually work with time series data. The data may come in AM/PM date
format or on 24 hour time basis. R can not recognize the two differences
automatically - at least for me. I have to specifically tell R in which
time format the data is. It seems that Pandas knows how to handle date
without being told the format. The problem arises when I try to shift time
by a certain time. Say
2008 Mar 24
2
Newbie help with Sweave
I think I've gotten my Emacs/Sweave/R system set up correctly, thanks to
Vincent and Jim, but I haven't been successful getting my first document
produced. I'm trying to use one of Friedrich Leisch's examples,
http://www.ci.tuwien.ac.at/~leisch/Sweave/example-1.Snw. I cut and
pasted the text into a document sweaveexample.Rnw in Emacs. It seemed to
be processed successfully with R:
2017 Jun 26
2
Odd behaviour in within.list() when deleting 2+ variables
>>>>> peter dalgaard <pdalgd at gmail.com>
>>>>> on Mon, 26 Jun 2017 13:43:28 +0200 writes:
> This seems to be due to changes made by Martin Maechler in
> 2008. Presumably this fixed something, but it escapes my
> memory.
Yes: The change set (svn -c46441) also contains the following NEWS entry
BUG FIXES
o
2012 Feb 23
1
Sexpr not getting expanded in Sweave
An Sweave file, 'test.Rnw':
\documentclass{article}
\title{Sweave minimal}
\author{MK}
\begin{document}
\maketitle
We try Sweave:
<<1>>=
data(airquality)
summary(airquality)
x <- airquality[1, 1]
@
I try Sexpr: \Sexpr{x}
We plot:
\begin{center}
<<2, fig=TRUE, echo=FALSE >>=
boxplot(Ozone ~ Month, data = airquality)
@
\end{center}
\end{document}
I check the
2017 Dec 19
1
lm considers removed predictors when finding complete cases
Dear R-devel list,
I realized that removing a predictor in lm through the "-"'s operator in
formula() does not affect the complete cases that are considered. A minimal
example is:
summary(lm(Wind ~ ., data = airquality))
# 42 observations deleted due to missingness
summary(lm(Wind ~ . - Ozone, data = airquality))
# still 42 observations deleted due to missingness, even if only 7
2010 Nov 11
4
Troubleshooting sweave
Hi All,
I've reproduced the example from Prof. Friedrich Leisch's webpage. When I
write sweave("Example-1.Snw") OR sweave("Example-1.Rnw"), (yes, I renamed
them). I get the following error:
Writing to file example-1.tex
Processing code chunks ...
1 : echo term verbatim
Error: chunk 1
Error in library(ctest) : there is no package called 'ctest'
Also while
2011 Dec 23
2
cast in reshape and reshape2
> library(reshape2)
> x = melt(airquality, id=c('month', 'day'))
With reshape I can cast with multiple functions:
> library(reshape)
> cast(x, month+variable~., c(mean,sd))
month variable mean sd
1 5 ozone 23.615385 22.224449
2 5 solar.r 181.296296 115.075499
3 5 wind 11.622581 3.531450
4 5 temp 65.548387
2012 Jan 06
1
Please help!! How do I set graphical parameters for ploting ctree()
I'm trying to understand how to set graphical parameters for trees created with the party package. For example take the following code:
library(party)
data(airquality)
airq <- subset(airquality, !is.na(Ozone))
airct <- ctree(Ozone ~ ., data = airq,
controls = ctree_control(maxsurrogate = 3))
plot(airct)
My problem is, I've got a ctree that has
2010 May 04
1
randomforests - how to classify
Hi,
I'm experimenting with random forests and want to perform a binary
classification task.
I've tried some of the sample codes in the help files and things run, but I
get a message to the effect 'you don't have very many unique values in the
target - are you sure you want to do regression?' (sorry, don't know exact
message but r is busy now so can't check).
In
2017 Jun 21
0
selecting dataframe columns based on substring of col name(s)
> On Jun 21, 2017, at 9:11 AM, Evan Cooch <evan.cooch at gmail.com> wrote:
>
> Suppose I have the following sort of dataframe, where each column name has a common structure: prefix, followed by a number (for this example, col1, col2, col3 and col4):
>
> d = data.frame( col1=runif(10), col2=runif(10), col3=runif(10),col4=runif(10))
>
> What I haven't been able to
2011 Nov 16
0
problem to tunning RandomForest, an unexpected result
Dear Researches,
I am using RF (in regression way) for analize several metrics extract from
image. I am tuning RF setting a loop using different range of mtry, tree
and nodesize using the lower value of MSE-OOB
mtry from 1 to 5
nodesize from1 to 10
tree from 1 to 500
using this paper as refery
Palmer, D. S., O'Boyle, N. M., Glen, R. C., & Mitchell, J. B. O. (2007).
Random Forest Models
2006 Jan 29
1
What does this command "~" mean?
Hi all,
I am reading books and tutorials about R.
I don't understand the following:
plot(salary~rank, data=salary)
plot(Ozone~date, data=airquality)
I don't understand what does "~" here, and how can plot() have a input
argument called "data"... I have looked it up in "plot"'s help but I could
not find about argument "data".
Could you please
2018 Dec 12
2
Subset dentro de un for
Gracias a los tres, Raúl, Marcelino y Carlos.
Lo del "get" de Marcelino me da la respuesta a lo que yo exactamente
preguntaba, y funciona, pero ahora tengo problemas con el for, por lo
que probablemente recurra al eval parse de Raúl o Carlos, que ya
tienen el for. Aún así, lo intento 1º con el get.
Con subset(df, subset=get(GT[i])>0) el problema es que en el for hago
un
2009 Apr 14
2
Subset function: selecting variables within a factor
Hi all
I know this must be an easy one so sorry for the trouble. I would like
to select a list of variables within a factor
The following example is given in help for subset:
subset(airquality, Temp > 80 select = c(Ozone, Temp))
So how do I select all temperatures of 90 and 80 ie Temp = c(80,90)
I would appreciate your help.
Kind regards
andy
Andrew McFadden MVS BVSc
Incursion
2018 Dec 12
2
Subset dentro de un for
Gracias Marcelino. Si, (i in 1:length(GT)), lo he utilizado mil veces,
pero se me sigue olvidando de una vez a otra. Lo iba a mirar, pero me
centré primero en que me hiciera bien el mapa.
He probado el for y me da este error:
Error in aes(x = lon, y = lat, color = get(GT[i]), size = 2) +
scale_colour_gradient(low = ("white"), :
non-numeric argument to binary operator