Displaying 20 results from an estimated 20000 matches similar to: "suggestion for make.names"
2007 Jan 12
0
Minor logical bug in rbind.data.frame ?
When attempting to merge 3 data frames, one of which has fewer columns
than the others, rbind.data.frame correctly refuses to perform the bind.
However, the error message given is a bit obscure due to a logical
bug in the match.names() internal function to rbind.data.frame.
Illustration:
## Three data frames with same column variable names:
> foo <- data.frame(v1 = c('a',
2006 Dec 02
0
fixup for debug package and R2.4.0
A number of users have spotted a terminal problem with the 'debug' package under R2.4.0, along the lines of
> mtrace(x)
> x()
Error in attr(value, "row.names") <- rlabs :
row names must be 'character' or 'integer', not 'double'
This arose from a bug in 'rbind.data.frame' in R2.4.0 itself. The bug is fixed in R2.4.0 patched, so the
2007 Mar 21
1
rbind.data.frame reacts on levels without factor (PR#9578)
Full_Name: Lutz Prechelt
Version: 2.4.1
OS: Windows XP
Submission from: (NULL) (160.45.111.67)
I stack a number of data.frames using rbind.
Each of these dataframes has a column 'authorname', which is a factor
and a column author = unclass(authorname) as piecewise pseudonyms.
When using rbind to stack these dataframes, R warns about invalid factor levels
and inserts all NAs in the author
2011 Jan 18
3
error message
I was running a sampling syntax based on a data frame (ago) of 160 rows and
25 columns. Below are the column names:
> names(ago)
[1] "SubID" "AGR1" "AGR2" "AGR3" "AGR4" "AGR5" "AGR6" "AGR7"
"AGR8"
[10] "AGR9" "AGR10" "WAGR1" "WAGR2"
2009 Oct 14
1
using mapply to avoid loops
Hello, I would like to use mapply to avoid using a loop but for some reason, I can't seem to get it to work. I've included copies of my code below. The first set of code uses a loop (and it works fine), and the second set of code attempts to use mapply but I get a "subscript out of bounds" error. Any guidance would be greatly appreciated. Xj, Yj, and Wj are also lists, and s2,
2006 Oct 18
1
strange error in mtrace
Dear useRs,
I am experiencing very strange error with Mark Bravington's package "debug".
I haven't seen them before.
Here is the sample session
> library(debug)
Loading required package: mvbutils
MVBUTILS: no "tasks" vector found in ROOT
Loading required package: tcltk
Loading Tcl/Tk interface ... done
> x<-function() return(1)
> mtrace(x)
> x()
Error
2008 Jul 01
1
[.data.frame speedup
Below is a version of [.data.frame that is faster
for subscripting rows of large data frames; it avoids calling
duplicated(rows)
if there is no need to check for duplicate row names, when:
i is logical
attr(x, "dup.row.names") is not NULL (S+ compatibility)
i is numeric and negative
i is strictly increasing
"[.data.frame" <-
function (x, i, j,
2008 Aug 27
2
r function for calculating extreme spread in group
I'm trying to figure out how to write a r function that will calculate
the extreme spread of a group of points given their (x,y)
coordinates. Extreme Spread is the maximal Euclidean distance between
two points in a group
ex.spread = max{ sqrt [ (xi-xj)^2 - (yi-yj)^2 ] } for i not equal to j
I have 60 levels to apply this to.
There is the combination function in the dprep package but
2004 May 24
1
as.matrix.data.frame() in R 1.9.0 converts to character when it should (?) convert to numeric
Conversion of a data frame to a matrix using as.matrix() when a
column of the data frame is POSIXt and all other columns are numeric
has changed in R 1.9.0 from R 1.8.1. The new behavior issues a
warning message and converts to a character matrix. In R 1.8.1, such
an object was converted to a numeric matrix.
Here is an example.
#### R 1.9.0 ####
> foo <- data.frame(
2019 May 26
2
rbind has confusing result for custom sub-class (possible bug?)
Debugging this issue:
https://github.com/Rdatatable/data.table/issues/2008
We have custom class 'IDate' which inherits from 'Date' (it just forces
integer storage for efficiency, hence, I).
The concatenation done by rbind, however, breaks this and returns a double:
library(data.table)
DF = data.frame(date = as.IDate(Sys.Date()))
storage.mode(rbind(DF, DF)$date)
# [1]
2017 Dec 01
1
Bug is as.matrix.data.frame with nested data.frame
Converting a data.frame with a nested data.frame to a matrix fails:
x <- structure(list(a = data.frame(letters)),
class = "data.frame",
row.names = .set_row_names(26))
as.matrix(x)
#> Error in ncol(xj) : object 'xj' not found
The offending code is here, in the definition of as.matrix.data.frame
(source/base/all.R):
for (j in pseq) {
2009 Oct 29
3
Weird error: Error in xj[i] : invalid subscript type 'list'
I got the error. I haven't been able to get a stand along case so that
I can show it here. But could somebody give some clue on what could
cause this error? Since I never defined xj[i], I don't understand
where this error come from.
Error in xj[i] : invalid subscript type 'list'
2019 May 26
2
rbind has confusing result for custom sub-class (possible bug?)
On Sun, May 26, 2019 at 4:06 AM Michael Chirico
<michaelchirico4 at gmail.com> wrote:
>
> Have finally managed to come up with a fix after checking out sys.calls()
> from within the as.Date.IDate debugger, which shows something like:
>
> [[1]] rbind(DF, DF)
> [[2]] rbind(deparse.level, ...)
> [[3]] `[<-`(`*tmp*`, ri, value = 18042L)
> [[4]] `[<-.Date`(`*tmp*`,
2019 May 27
2
rbind has confusing result for custom sub-class (possible bug?)
Yes, thanks for following up on thread here. And thanks again for clearing
things up, your email was a finger snap of clarity on the whole issue.
I'll add that actually it was data.table's code at fault on the storage
conversion -- note that if you use an arbitrary sub-class 'foo' with no
methods defined, it'll stay integer.
That's because [<- calls as.Date and then
2003 Jun 18
3
update.default bugfix (PR#3288)
According to the man page for formula, "a formula object has an associated
environment". However, update.default doesn't use this environment, which
creates problems like the following:
make.model <- function(x) { lm(medv~.,x) }
library(MASS)
data(Boston)
fit = make.model(Boston)
fit = update(fit,".~.-crim")
# Object "x" not found
Here is a
2009 Nov 04
4
unexpected results in comparison (x == y)
Dear readers of the list,
I have a problem a comparison of two data from a vector. The comparison
yields FALSE but should be TRUE. I have checked for mode(), length() and
attributes(). See the following code (R2.10.0):
-----------------------------------------------
# data vector of 66 double data
X =
2007 Mar 29
0
(PR#9578) rbind.data.frame reacts on levels without
In your data frames, 'y' is a category and the following comment in the
code makes clear this is deliberate.
if( !is.null(levels(xj)) ) {
all.levs[[j]] <- levels(xj)
facCol[j] <- TRUE # turn categories into factors
} else facCol[j] <- is.factor(xj)
The behaviour is compatible with S apart from the comment in the R help
2017 Oct 09
1
Using response variable in interaction as explanatory variable in glm crashes R
>>>>> Jan van der Laan <rhelp at eoos.dds.nl>
>>>>> on Fri, 6 Oct 2017 12:13:39 +0200 writes:
> It is actually model.matrix that crashes, not glm. Same
> crash occurs with e.g. lm.
> model.matrix(dob_mon ~ dob_day*dob_mon, data = tab)
> also crashes R.
Yes, segmentation fault.
It only happens when these are *logical*
2019 Jun 02
1
rbind has confusing result for custom sub-class (possible bug?)
I thought it would be good to summarize my thoughts, since I made a
few hypotheses that turned out to be false.
This isn't a bug in base R, in either rbind() or `[<-.Date`.
To summarize the root cause:
base::rbind.data.frame() calls `[<-` for each column of the
data.frame, and there is no `[<-.IDate` method to ensure the
replacement value is converted to integer. And, in fact,
2005 May 26
1
Simplify formula for heterogeneity
Dear R-ians,
I'm looking for a computational simplified formula to calculate a
measure for heterogeneity (let's say H ):
H = sqrt [ (Si (Sj (Xi - Xj)?? ) ) /n ]
where:
sqrt = square root
Si = summation over i (= 0 to n)
Sj = summation over j (= 0 to n)
Xi = element of X with index i
Xj = element of X with index j
I can simplify the formula to:
H = sqrt [ ( 2 * n * Si (Xi) - 2 Si (Sj