Knut M. Wittkowski
2006-Dec-13 23:04 UTC
[R] How to avoid test for NAs in foreign function call
We have packed logical vectors into integers, 32 flags at a time and
then want to AND or OR these vectors of "integers" using other C
functions.
The problem: occasionally, the packed sequence of 32 logical values
resembles NA, causing the error message:
Error in bitAND(packed1, packed2, lenx) :
NAs in foreign function call (arg 1)
How does one instruct R to avoid checking for NAs?
Knut M. Wittkowski, PhD,DSc
------------------------------------------
The Rockefeller University,
Center for Clinical and Translational Science
Research Design and Biostatistics,
1230 York Ave #121B, Box 322, NY,NY 10021
+1(212)327-7175, +1(212)327-8450 (Fax), kmw at rockefeller.edu
http://www.rockefeller.edu/ccts/rdbs.php
Supply NAOK=TRUE argument to .C; the help page for .C() contains the
following:
Usage
.C(name, ..., NAOK = FALSE, DUP = TRUE, PACKAGE)
Also, you might want to consider using the "raw" data type instead of
integers -- that way you should have fewer problems with R code making
unwanted interpretations of certain bit patterns.
-- Tony Plate
Knut M. Wittkowski wrote:> We have packed logical vectors into integers, 32 flags at a time and
> then want to AND or OR these vectors of "integers" using other C
functions.
>
> The problem: occasionally, the packed sequence of 32 logical values
> resembles NA, causing the error message:
>
> Error in bitAND(packed1, packed2, lenx) :
> NAs in foreign function call (arg 1)
>
> How does one instruct R to avoid checking for NAs?
>
> Knut M. Wittkowski, PhD,DSc
> ------------------------------------------
> The Rockefeller University,
> Center for Clinical and Translational Science
> Research Design and Biostatistics,
> 1230 York Ave #121B, Box 322, NY,NY 10021
> +1(212)327-7175, +1(212)327-8450 (Fax), kmw at rockefeller.edu
> http://www.rockefeller.edu/ccts/rdbs.php
>
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