[R] If/then statement, if in a list then

[Bert Gunter]

Sorry, one error:

On Mon, Jul 30, 2012 at 1:18 PM, Bert Gunter <bgunter at gene.com> wrote:
> ??
>
> On Mon, Jul 30, 2012 at 11:46 AM, R. Michael Weylandt
> <michael.weylandt at gmail.com> wrote:
>> On Mon, Jul 30, 2012 at 8:49 AM, Bert Gunter <gunter.berton at gene.com> wrote:
>>> Not necessarily. If the OP really meant the R list() structure, then
>>> is.element does not apply.
>>
>> Perhaps...
>>
>> x <- list(1:5, "a", `+`, rnorm, NULL, list(letters))
>
> Note:
>> is.element((1:5),x)
> [1] FALSE FALSE FALSE FALSE FALSE
>
> ##The answer should be TRUE -- the vector (1:5) is a list component.
>
> Similarly:
##### Should have been:###############

> is.element(list(letters),x)
[1] FALSE
 The answer again should be TRUE.
#####################################
>
>> is.element(rnorm,x)
> Error in match(el, set, 0L) : 'match' requires vector arguments
>
> ## The answer should be TRUE.
>
> So I do not understand what your point is. I stand by my claim:
> is.element is not intended for lists, and this is made clear (to me,
> anyway) in the help file.
>
> -- Bert
>
>
>
>
>
>
>>
>> letters %in% x # Works -- vectorized, mostly false, but the "a" is
>> there, per below
>> "a" %in% x # Works, true
>>
>> 1 %in% x # Works, false
>> 1:5 %in% x # Works -- vectorized, false
>> list(1:5) %in% x # Works, true
>>
>> `+` %in% x # Error
>> NULL %in% x # logical(0)
>>
>> so it seems is.element / %in% [chacun son gout] works with "vectors"
>> (in a rather broad sense of that word)
>>
>> I'm still trying to understand quite how this one works though:
>>
>> list(letters) %in% x # Works -- false: this one surprised me!
>> identical(list(letters), x[[6]]) # True
>>
>> Best,
>> Michael
>
>
>
> --
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
> Internal Contact Info:
> Phone: 467-7374
> Website:
> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm