er. But I appreciate the
explanation and the solutions.
-Original Message-
From: PIKAL Petr
Sent: Monday, October 11, 2021 5:15 AM
To: Jiefei Wang ; Derickson, Ryan, VHA NCOD
Cc: r-help@r-project.org
Subject: [EXTERNAL] RE: [R] unexpected behavior in apply
Hi
it is not surprising
On Mon, 11 Oct 2021 09:15:27 +
PIKAL Petr wrote:
>
> data.frame is not matrix or array (even if it rather resembles one)
>
> So if you put a cake into oven you cannot expect getting fried
> potatoes from it.
Another fortune nomination!
cheers,
Rolf
--
Honorary Research Fellow
SE
Cheers
Petr
> -Original Message-
> From: R-help On Behalf Of Jiefei Wang
> Sent: Friday, October 8, 2021 8:22 PM
> To: Derickson, Ryan, VHA NCOD
> Cc: r-help@r-project.org
> Subject: Re: [R] unexpected behavior in apply
>
> Ok, it turns out that this is doc
Ok, it turns out that this is documented, even though it looks surprising.
First of all, the apply function will try to convert any object with
the dim attribute to a matrix(my intuition agrees with you that there
should be no conversion), so the first step of the apply function is
>
Hello,
The issue comes that 'apply' tries to coerce its argument to a matrix. This
means that all your columns will become character class, and the result
will not be what you wanted. I would suggest something more like:
sapply(d, function(x) all(x[!is.na(x)] <= 3))
or
vapply(d, function(x)
Hi,
I guess this can tell you what happens behind the scene
> d<-data.frame(d1 = letters[1:3],
+ d2 = c(1,2,3),
+ d3 = c(NA,NA,6))
> apply(d, 2, FUN=function(x)x)
d1 d2 d3
[1,] "a" "1" NA
[2,] "b" "2" NA
[3,] "c" "3" " 6"
> "a"<=3
[1] FALSE
> "2"<=3
[1] TRUE
>
Hello,
I'm seeing unexpected behavior when using apply() compared to a for loop when a
character vector is part of the data subjected to the apply statement. Below, I
check whether all non-missing values are <= 3. If I include a character column,
apply incorrectly returns TRUE for d3. If I
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'. It is not a
bug, it is per spec, but it is so counterintuitive that I thought it could
be interesting.
I have an array, let's say test, dim=c(7,5).
test - array(1:35, dim=c(7, 5))
test
[,1] [,2] [,3] [,4] [,5]
On 13-05-14 4:52 AM, Luca Nanetti wrote:
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'. It is not a
bug, it is per spec, but it is so counterintuitive that I thought it could
be interesting.
I have an array, let's say test, dim=c(7,5).
test - array(1:35,
On Tue, 14 May 2013, Luca Nanetti luca.nane...@gmail.com writes:
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'. It is not a
bug, it is per spec, but it is so counterintuitive that I thought it could
be interesting.
I have an array, let's say test, dim=c(7,5).
Hello,
The problem is that apply returns the results vector by vector and in R
vectors are column vectors. This is not exclusive of apply with sample
as the function to be called, but of apply in general. Try, for instance
apply(test, 1, identity) # transposes the array
The rows are
On 14-May-2013 09:46:32 Duncan Murdoch wrote:
On 13-05-14 4:52 AM, Luca Nanetti wrote:
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'.
It is not a bug, it is per spec, but it is so counterintuitive
that I thought it could be interesting.
I have an array, let's
On Tue, May 14, 2013 at 4:52 AM, Luca Nanetti luca.nane...@gmail.com wrote:
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'. It is not a
bug, it is per spec, but it is so counterintuitive that I thought it could
be interesting.
I have an array, let's say test,
t(apply(test,1,sample)) will also do.
As the OP noted, the results are simply transposed. So if an operation is
to be applied to rows, yielding modified rows, simply transpose the results.
Cheers,
Tsjerk
On Tue, May 14, 2013 at 12:07 PM, Ted Harding ted.hard...@wlandres.netwrote:
On
This is Circle 8.1.47 of 'The R Inferno'.
http://www.burns-stat.com/documents/books/the-r-inferno/
Pat
On 14/05/2013 09:52, Luca Nanetti wrote:
Dear experts,
I wanted to signal a peculiar, unexpected behaviour of 'apply'. It is not a
bug, it is per spec, but it is so counterintuitive that I
15 matches
Mail list logo
