From w||||@mwdun|@p @end|ng |rom gm@||@com  Mon May  2 17:07:41 2022
From: w||||@mwdun|@p @end|ng |rom gm@||@com (Bill Dunlap)
Date: Mon, 2 May 2022 08:07:41 -0700
Subject: [Rd] 
 New R version - Issue with as.vector coercion on data.frame
In-Reply-To: <8CF8374A-8E45-47FD-BD8A-418102EA6729@eniso-partners.com>
References: <8CF8374A-8E45-47FD-BD8A-418102EA6729@eniso-partners.com>
Message-ID: <CAHqSRuRC=Kptkcp6us6MsgYy2La+b=189fat=g4Y55apaB8mSA@mail.gmail.com>

In R-4.1.2 (and before) as.vector(aDataFrame) returned aDataFrame,
unchanged.  E.g.,
  4.1.2> aDataFrame <- data.frame(X=101:103, Y=201:203, Z=301:303)
  4.1.2> attr(aDataFrame, "anAttr") <- "an attribute"
  4.1.2> identical(as.vector(aDataFrame), aDataFrame)
  [1] TRUE
  4.1.2> dput(aDataFrame)
  structure(list(X = 101:103, Y = 201:203, Z = 301:303), class =
"data.frame", row.names = c(NA, -3L), anAttr = "an attribute")

In R-4.2.0 it removes the class, names, and row.names attributes, but
leaves other stray attributes alone.  E.g.,
  4.2.0> aDataFrame <- data.frame(X=101:103, Y=201:203, Z=301:303)
  4.2.0> attr(aDataFrame, "anAttr") <- "an attribute"
  4.2.0> identical(as.vector(aDataFrame), aDataFrame)
  [1] FALSE
  4.2.0> dput(aDataFrame)
  structure(list(X = 101:103, Y = 201:203, Z = 301:303), class =
"data.frame", row.names = c(NA, -3L), anAttr = "an attribute")
  4.2.0> dput(as.vector(aDataFrame))
  structure(list(X = 101:103, Y = 201:203, Z = 301:303), anAttr = "an
attribute")

In both versions as.list(aDataFrame) returns the same thing that R-4.1.2's
as.vector(aDataFrame) did.

I think that as.vector() is a function that few people should use.   It has
almost nothing to do with with the notion of a vector in math or physics.

-Bill

On Mon, May 2, 2022 at 2:19 AM Marc Weibel <marc.weibel at eniso-partners.com>
wrote:

> Hi
>
> I recently upgraded to the latest r version and got an issue with the
> command as.vector() on a data.frame object. With the previous R version the
> returned object was a vector but now it is formatted as a list (see below)
>
>
> > futures_quotes
>   SMI Future SMIM Future Euro Stoxx 50 Future S&P 500 Mini Future FTSE 100
> Future Nikkei 225 Future
> 1      11999        2871                 3692                4150
>   7419             26853
> > class(futures_quotes)
> [1] "data.frame"
>
> > as.vector(futures_quotes[1,1:3])
> $`SMI Future`
> [1] 11999
>
> $`SMIM Future`
> [1] 2871
>
> $`Euro Stoxx 50 Future`
> [1] 3692
>
> > class(as.vector(futures_quotes[1,1:3]))
> [1] "list"
>
>
> Can you help me on this ? (I solved the issue temporarily with
> as.vector(t(futures_quotes[1,1:3]))
>
> Kind regards
> Marc Weibel
>
>
>
>  <http://www.enisopartners.com/>
> Dr. Marc Weibel
> CIO & Partner
> Tel: +41 44 286 17 02
> Mob: +41 78 892 96 55
> E-Mail: marc.weibel at enisopartners.com <mailto:
> marc.weibel at enisopartners.com>
>
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[Rd] New R version - Issue with as.vector coercion on data.frame
Bill Dunlap