On 27/08/2021 3:06 p.m., Enrico Schumann wrote:
On Fri, 27 Aug 2021, Gabor Grothendieck writes:
Are there any guarantees of whether x will equal 1 or 2 after this is run?
(x <- 1) * (x <- 2)
## [1] 2
x
## [1] 2
At least the "R Language Definition" [1] says
"The exponentiation operator ‘^
On Fri, 27 Aug 2021, Gabor Grothendieck writes:
> Are there any guarantees of whether x will equal 1 or 2 after this is run?
>
> (x <- 1) * (x <- 2)
> ## [1] 2
> x
> ## [1] 2
At least the "R Language Definition" [1] says
"The exponentiation operator ‘^’ and the left
assignment plus minus op
Due to lazy evaluation, the order of operations can be pretty random in R.
Actually, some operations may not be performed at all, sometimes.
The following program illustrates the issue:
test1=function(x,y) {}
test2=function(x,y) {x;y}
test3=function(x,y) {y;x}
alpha="hello"
test1(alpha <- 1, al
Running things in various forms of parallel opens up all kinds of issues.
Currently, programs that use forms like "threads" often need to carefully
protect any variables that can be changed using things like locks.
So what would they do in the scenario being discussed? Would they need to
analyz
It could be that the two sides of * are run in parallel in the future and maybe
not having a guarantee would simplify implementation?
On Fri, Aug 27, 2021 at 12:35 PM Avi Gross via R-devel
wrote:
>
> Does anyone have a case where this construct has a valid use?
>
> Didn't Python add a := operat
Does anyone have a case where this construct has a valid use?
Didn't Python add a := operator recently that might be intended more for
such uses as compared to using the standard assignment operators? I wonder
if that has explicit guarantees of what happens in such cases, but that is
outside wha
I agree and personally never do this but I would still like to know if it
is guaranteed behavior or not.
On Fri, Aug 27, 2021 at 11:28 AM Thierry Onkelinx
wrote:
> IMHO this is just bad practice. Whether the result is guaranteed or not,
> doesn't matter.
>
> ir. Thierry Onkelinx
> Statisticus /
IMHO this is just bad practice. Whether the result is guaranteed or not,
doesn't matter.
ir. Thierry Onkelinx
Statisticus / Statistician
Vlaamse Overheid / Government of Flanders
INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
FOREST
Team Biometrie & Kwaliteitszorg / Te
Are there any guarantees of whether x will equal 1 or 2 after this is run?
(x <- 1) * (x <- 2)
## [1] 2
x
## [1] 2
--
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com
__
R-devel@r-p
Dear R developers,
R makes some functions interruptible, thanks to a call to R_CheckUserInterrupt.
Simple arithmetic operations can be interrupted avoiding freezes when using
huge arrays (e.g. length > 1 billion).
But many operations, such as matrix multiplication, are not interruptible. I
es
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