[Rd] New R version - Issue with as.vector coercion on data.frame

[Bill Dunlap]

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

I sent this too quickly.  I meant to say that as.list(aDataFrame) did the
same in both versions.  Since as.vector(aDataFrame) in 4.1.2 did nothing,
you can just drop that line from your code.

-Bill

On Mon, May 2, 2022 at 8:07 AM Bill Dunlap <williamwdunlap using gmail.com> wrote:

> 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 using 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/>
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>> Tel: +41 44 286 17 02
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