[R] an eval/parse trivia

[rpugh@mango-solutions.com]

Is the data structure a factor variable containing character strings? 
That would account for the lack of quotes and the "Levels" bit.  If so,
try
eval(parse(text=as.character(...))).

> x <- factor('structure(1:3, .Names=LETTERS[1:3])')
> eval(parse(text=as.character(x)))
A B C
1 2 3

Weird data structure to play with though - I agree with the "go back to
the maintainers" comment ...

Cheers,
Rich.

> Vincent  -
>
>>From the values shown, this looks like a Bioconductor question,
> rather than base R.  You might try the maintainers of whatever
> package the function comes from.
>
> Is 2287 the index in "levels" for one of the character strings
> shown ?
>
> -  tom blackwell  -  u michigan medical school  -  ann arbor  -
>
> On Wed, 10 Dec 2003, Vincent Detours wrote:
>
>> Dear all,
>>
>> Any cue on how to evaluate x?
>>
>> > x
>> [1] structure(c("GO:0004707", "GO:0005524", "GO:0004674",
>> "GO:0006468", "GO:0000074", "GO:0008372", "GO:0016740"), .Names =
>> c("NAS", "NAS", "IEA", "IDA", "NAS", "ND", "IEA"))
>> 6204 Levels: GO:0000074 GO:0000158 GO:0000163 GO:0000166 ...
>> structure(c("GO:0019538", "GO:0016706"), .Names =
>> c("IEA", "IEA"))
>> > parse(text=x) #a failed attempt
>> expression(2287)
>> > eval(parse(text=x))
>> [1] 2287
>> >
>>
>> Any idea? By the way why does parse return 2287?
>>
>> Thanks for your help,
>>
>> Vincent Detours
>>
>> ______________________________________________
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>>
>
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