On Jun 7, 2007, at 11:33 AM, Douglas Bates wrote:
> On 6/6/07, Aniko Szabo <[EMAIL PROTECTED]> wrote:
>> Thanks to everybody who responded to my question.
>> asInteger(coerceVector(x,INTSXP)) indeed does what I need. I guess
>> there
>> is a lot I don't understand about type coercion, as I would not have
>> expected it to work.
>
> It is better to use
>
> asInteger(x)
>
> which will do the coercion if necessary.
Unfortunately not if it gets a character vector:
> .Call("foo","1")
Error: unimplemented type 'character' in 'asInteger'
> When you do the coercion
> yourself you should PROTECT the result then UNPROTECT it. Calling
> asInteger directly avoids this overhead without the risk of losing
> data in a garbage collection. asInteger can accomplish this because
> only the first element of the SEXP x is converted to an integer.
>
It could, but doesn't ;). That is what the original IntegerFromString
did, but now you either have to do that yourself or coerce the whole
vector (not as efficient but easier to write :P).
Cheers,
Simon
>>
>> Aniko
>>
>> -----Original Message-----
>> From: Seth Falcon [mailto:[EMAIL PROTECTED]
>> Sent: Tuesday, June 05, 2007 11:24 PM
>> To: Aniko Szabo
>> Cc: r-devel@r-project.org
>> Subject: Re: [Rd] missing IntegerFromString()
>>
>> Hi Aniko,
>>
>> "Aniko Szabo" <[EMAIL PROTECTED]> writes:
>>
>>> I have created a DLL not so long ago using C code. My code used the
>>> IntegerFromString() function that used to be exported in the
>>> Rinternals.h header file (and thus easily accessible). Recently I
>>> upgraded to R 2.5.0 and my DLL stopped working. I see that the
>>> IntegerFromString() function is not exported in any of the header
>> files
>>> in the RHOME\include directory. Is it possible for me to use it
>> without
>>> installing all R source files? I can see that the function is in
>>> coerce.c, however it #includes other stuff that I don't have and
>>> I am
>>> afraid to mess things about by doing things I don't understand. Or
>>> perhaps there is another function that is intended to be used
>>> instead?
>>
>> I think you want asInteger (which calls IntegerFromString). This is
>> in RHOME/include/Rinternals.h
>>
>> Best Wishes,
>>
>> + seth
>>
>> PS: Nice to see you again :-)
>>
>>
>> --
>> Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research
>> Center
>> http://bioconductor.org
>>
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>
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