Dealing with NAs in C

Hello,

See section 5.10.3 of the R-exts.pdf.

There are macros ISNA(x) and ISNAN(x) (only for 'double') and constants
NA_INTEGER, NA_REAL,
 NA_LOGICAL and NA_STRING.

I am currently converting a lot of R code to C in order to make it more
efficient. A lot of the data involves NAs. As
the data is mainly integers > 0, I am just setting all NAs to 0 then
sending it to the C code then resetting them to
NAs again after the C program is done, to be compatible with the rest of
the R code.

In a C function you could use

int x;

if(x == NA_INTEGER){
    // process an integer NA
}

Hope this helps,

Rui Barradas


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