>>>>> akshay kulkarni
>>>>> on Sat, 17 Jun 2023 18:35:53 +0000 writes:
> Dear Bert, Duncan's theory is working....probably the same
> as yours...
"theory" .. well *truth*.
Note that I wrote a blog post I had hope would be read more
( --> and be cited more .. when helping peopling with such problems ;-))
Simple search ("google") for "class think R blog"
or directly
https://blog.r-project.org/2019/11/09/when-you-think-class.-think-again/
To say it again: Using something like
if(... class(x) == "<cls>" ..)
is almost always (*) bad code.
Everyone should learn about inherits() and why sane R code
should use that instead.
---
*) It may be ok, e.g., when `x` was very expliclitly
constructed in the same part of code a bit earlier
Martin
> THanking you, Yours sincerely, AKSHAY M KULKARNI
> ________________________________ From: Bert Gunter
> <bgunter.4567 at gmail.com> Sent: Saturday, June 17, 2023
> 11:28 PM To: akshay kulkarni <akshay_e4 at hotmail.com> Cc: R
> help Mailing list <r-help at r-project.org> Subject: Re: [R]
> warnng to an error....
> What is class(x) ??
> I think you need to (re?) learn about S3 classes, which
> can in general be vectors. See ?class (the S3 portion) or
> any tutorial on S3 classes in R. I have no idea what you
> are trying to do, but I *suspect* it may be accomplished
> through S3 inheritance rather than changing the class
> vector. That is just a guess, however.
> -- Bert
> On Sat, Jun 17, 2023 at 10:27?AM akshay kulkarni
> <akshay_e4 at hotmail.com<mailto:akshay_e4 at hotmail.com>>
> wrote: Dear members, AN update: I have changed the if
> clause to:
> if(class(x)[1] == "xts") || class(x)[2] == "zoo")
{code}
> but am bootless.....
> PLease help...
> THanking you, Yours sincerely, AKSHAY M KULKARNI
> ________________________________ From: R-help
> <r-help-bounces at r-project.org<mailto:r-help-bounces at
r-project.org>>
> on behalf of akshay kulkarni
> <akshay_e4 at hotmail.com<mailto:akshay_e4 at hotmail.com>>
> Sent: Saturday, June 17, 2023 10:46 PM To: R help Mailing
> list <r-help at r-project.org<mailto:r-help at
r-project.org>>
> Subject: [R] warnng to an error....
> Dear members,
> I have the following code:
>> FUN(OHLCDataEP[[63]])
> Error in (class(x) == "xts") || (class(x) == "zoo")
:
> 'length = 2' in coercion to 'logical(1)'
>> traceback()
> 2: ygix(x, "c") at <tmp>#9 1: FUN(OHLCDataEP[[63]])
>> class(OHLCDataEP[[63]])
> [1] "xts" "zoo"
> The following is in ygix() :
> if((class(x) == "xts") || (class(x) == "zoo")
> I think this would have been a warning
>
(https://stackoverflow.com/questions/72848442/r-warning-lengthx-2-1-in-coercion-to-logical1)
> but I am on a ubuntu22.04 machine with R 4.3.0.
> What should I do? Change it to: if((class(x)[1] == "xts")
> || (class(x)[2] == "zoo")) {code}...
> or is there any workaround?
> THanking you, Yours sincerely, AKSHAY M KULKARNI
> [https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon at
2.png?v=73d79a89bded]<https://stackoverflow.com/questions/72848442/r-warning-lengthx-2-1-in-coercion-to-logical1>
> R Warning 'length(x) = 2 > 1' in coercion to
>
'logical(1)'<https://stackoverflow.com/questions/72848442/r-warning-lengthx-2-1-in-coercion-to-logical1>
> Using R 4.1.3 I observe: var <- 0 >
> if(is.data.frame(var) || is.vector(var)) var <-
> as.matrix(var) > is.null(var) || (!is.matrix(var)
> && var == 0) || (dim(var)==c(1,1) &&...
> stackoverflow.com<http://stackoverflow.com> ?
> [[alternative HTML version deleted]]
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> [[alternative HTML version deleted]]
> ______________________________________________
> R-help at r-project.org<mailto:R-help at r-project.org> mailing
> list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do
> read the posting guide
> http://www.R-project.org/posting-guide.html and provide
> commented, minimal, self-contained, reproducible code.
> [[alternative HTML version deleted]]
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and
> more, see https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html and provide
> commented, minimal, self-contained, reproducible code.