Displaying 20 results from an estimated 11000 matches similar to: "Assign and cmpfun"
2016 Dec 08
3
wish list: generalized apply
Dear All,
I regularly want to "apply" some function to an array in a way that the arguments to the user function depend on the index on which the apply is working. A simple example is:
A <- array( runif(160), dim=c(5,4,8) )
x <- matrix( runif(32), nrow=4, ncol=8 )
b <- runif(8)
f1 <- function( A, x, b ) { sum( A %*% x ) + b }
result <- rep(0.0,8)
for (i in 1:8) {
2015 Sep 14
3
Optimization bug when byte compiling with gcc 5.2.0 on windows
When building R-devel with gcc 5.2.0 (mingw-w64 v4) on Windows, make
check fails reg-tests-1b.R at the following check:
x <- c(1:2, NA)
sx <- sd(x)
!is.nan(sx)
Here 'sx' should be 'NA' but it is 'NaN'. It turns out this problem
only appears when the function is byte compiled with optimization
level 3:
mysd <- function (x, na.rm = FALSE)
sqrt(var(if
2019 Jan 03
2
Compiler + stopifnot bug
Hi,
I found the following issue in r-devel (2019-01-02 r75945):
`foo<-` <- function(x, value) {
bar(x) <- value * x
x
}
`bar<-` <- function(x, value) {
stopifnot(all(value / x == 1))
x + value
}
`foo<-` <- compiler::cmpfun(`foo<-`)
`bar<-` <- compiler::cmpfun(`bar<-`)
x <- c(2, 2)
foo(x) <- 1
x # should be c(4, 4)
#> [1] 3 3
If the functions
2011 Jun 23
2
Loading List data into R with scan()
Hi All,
I've been given a data file of the form:
1: 3,4,5,6
2:1,2,3
43: 5,7,8,9,5
and i want to read this data in as a list to create the form:
(guessing final look)
my.list
[[1]]
[1] 3 4 5 6
[[2]]
[1] 1 2 3
[[43]]
[1] 5 7 8 9 5
I can get to a stage using scan:
scan("my.data", what = character(0), quiet = TRUE)
to load
[1] "1: 3,4,5,6"
[2] "2:1,2,3"
[3]
2019 Jan 04
2
Compiler + stopifnot bug
On 03/01/2019 3:37 p.m., Duncan Murdoch wrote:
> I see this too; by bisection, it seems to have first appeared in r72943.
Sorry, that was a typo. I meant r75943.
Duncan Murdoch
>
> Duncan Murdoch
>
> On 03/01/2019 2:18 p.m., I?aki Ucar wrote:
>> Hi,
>>
>> I found the following issue in r-devel (2019-01-02 r75945):
>>
>> `foo<-` <-
2005 Apr 27
1
RE: [R] when can we expect Prof Tierney's compiled R?
Luke,
Thank you for sharing the benchmark results. The improvement is very
substantial, I am looking forward to the release of the byte compiler!
The arithmetic shows that x[i]<- is still the bottleneck. I suspect that
this is due to a very involved dispatching/search for the appropriate
function on the C level. There might be significant gain if loops
somehow cached the result of the initial
2016 Nov 11
2
Frames in compiled functions
I noticed some problems that cropped in the latest versions of R-devel (2016-11-08 r71639 in my case) for one of my packages. I _think_ I have narrowed it down to the changes to what gets byte-compiled by default. The following example run illustrates the problem I'm having:
compiler::enableJIT(0)
fun <- function(x) local(as.list(parent.frame(2)))
fun(1)
## $x
## [1] 1
##
2019 Jan 04
2
Compiler + stopifnot bug
Thanks for the reports. Will look into it soon and report back.
Luke
Sent from my iPhone
> On Jan 3, 2019, at 2:15 PM, Martin Morgan <mtmorgan.bioc at gmail.com> wrote:
>
> For what it's worth this also introduced
>
>> df = data.frame(v = package_version("1.2"))
>> rbind(df, df)$v
> [[1]]
> [1] 1 2
>
> [[2]]
> [1] 1 2
2011 Dec 13
1
Rcpp too good to be true?
Hello all,
I've been working on a package to do various things related to the
Conway-Maxwell-Poisson distribution and wanted to be able to make fast
random draws from the distribution. My R code was running quite slow so I
decided to give Rcpp a bash. I had used it before but only for extremely
basic stuff and always using inline. This time I decided to give making a
proper package a go.
2010 Feb 25
3
behavior of seq_along
I'm trying to understand the behavior of seq_along in the following example:
x <- 1:5; sum(x)
y <- 6:10; sum(y)
data <- c(x,y)
S <- sum( data[seq_along(x)] )
S
T <- sum( data[seq_along(y)] )
T
Why is T != sum(y) ?
2017 Nov 22
2
function pointers?
We have a project that calls for the creation of a list of many
distribution objects. Distributions can be of various types, with
various parameters, but we ran into some problems. I started testing
on a simple list of rnorm-based objects.
I was a little surprised at the RAM storage requirements, here's an example:
N <- 10000
closureList <- vector("list", N)
nsize = sample(x
2007 Apr 03
1
Behavior of seq_along (was: Create a new var reflecting the order of subjects in existing var)
I am moving this from r-help to r-devel. Based on offline communications
with Jim, suppose dat is defined as follows:
set.seed(123)
dat <- data.frame(ID= c(rep(1,2),rep(2,3), rep(3,3), rep(4,4),
rep(5,5)), var1 =rnorm(17, 35,2), var2=runif(17,0,1))
# Then this ave call works as expected:
ave(dat$ID, dat$ID, FUN = function(x) seq_along(x))
# but this apparently identical calculation
2009 Jul 09
1
bug in seq_along
Using the IRanges package from Bioconductor and somewhat recent R-2.9.1.
ov = IRanges(1:3, 4:6)
length(ov) # 3
seq(along = ov) # 1 2 3 as wanted
seq_along(ov) # 1!
I had expected that the last line would yield 1:3. My guess is that
somehow seq_along don't utilize that ov is an S4 class with a length
method.
The last line of the *Details* section of ?seq has a typeo. Currently
it is
2012 Nov 30
1
xts indexed with Date class
Hi
I see a changed behaviour in xts indexed on class Date in the latest
versions, versus 2.
It seems to be related to changes to/from daylight savings time,
happens those weekends.
Is it not intended that class Date be used like this, or is this new
behaviour incorrect?
Giles
Example:
> a<-as.Date(15423:15426)
> x<-xts(seq_along(a),a)
> print(x)
[,1]
2012-03-24
2012 Jan 06
1
seq_along and rep_along
Hi all,
A couple of ideas for improving seq_along:
* It would be really useful to have a second argument dim:
seq_along(mtcars, 1)
seq_along(mtcars, 2)
# equivalent to
seq_len(dim(mtcars)[1])
seq_len(dim(mtcars)[2])
I often find myself wanting to iterate over the rows or column of a
data frame, and there isn't a particularly nice idiom if you want to
avoid problems
2017 Jun 14
2
[WISH / PATCH] possibility to split string literals across multiple lines
Mark, that's actually a fair statement, although your extra operator
doesn't cause construction at parse time. You still call paste0(), but just
add an extra layer on top of it.
I also doubt that even in gigantic loops the benefit is going to be
significant. Take following example:
atestfun <- function(x){
y <- paste0("a very long",
"string for
2019 May 16
3
print.<strorageMode>() not called when autoprinting
In R-3.6.0 autoprinting was changed so that print methods for the storage
modes are not called when there is no explicit class attribute. E.g.,
% R-3.6.0 --vanilla --quiet
> print.function <- function(x, ...) { cat("Function with argument list ");
cat(sep="\n ", head(deparse(args(x)), -1)); invisible(x) }
> f <- function(x, ...) { sum( x * seq_along(x) ) }
2019 Mar 31
3
stopifnot
Ah, with R 3.5.0 or R 3.4.2, but not with R 3.3.1, 'eval' inside 'for' makes compiled version behave like non-compiled version.
options(error = expression(NULL))
library(compiler)
enableJIT(0)
f <- function(x) for (i in 1) {x; eval(expression(i))}
f(is.numeric(y))
# Error: object 'y' not found
fc <- cmpfun(f)
fc(is.numeric(y))
# Error: object 'y' not found
2009 Nov 22
2
Help with indexing
Dear R Helpers,
I am missing something very elementary here, and I don't seem to get it from the help pages of the ave, seq and seq_along functions, so I wonder if you could offer a quick help.
To use an example from an earlier post on this list, I have a dataframe of this kind:
dat = data.frame(name = rep(c("Mary", "Sam", "John"), c(3,2,4)))
dat$freq =
2012 Nov 20
2
correct function formation in R
Dear list!
?
I have question of?'correct function formation'. Which function (fun1 or fun2; see below) is written more correctly? Using ''structure'' as output or creating empty ''data.frame'' and then transform it as output? (fun1 and fun1 is just for illustration).
?
Thanks a lot, OV
?
code:
input <- data.frame(x1 = rnorm(20), x2 = rnorm(20), x3 =