Dear R users,
Have you experienced any difficulty in calling R's ISNAN() from a C code? I have C codes including ISNAN() calls and they worked well until I upgraded my R from 1.7 to later versions. When I tried to compile the codes in the version 1.8 and 1.9, I got error messages like this:
test.obj : error LNK2001: unresolved external symbol _isnan .\testR.dll : fatal error LNK1120: 1 unresolved externals NMAKE : fatal error U1077: 'link.exe' : return code '0x460' Stop.
I checked "Writing R Extensions" and did not find any changes in the API entry point for ISNAN in the later versions. Could any one enlighten me on why _isnan cannot be resolved? The compiler I used is MSVC++ 6.0 and the platform is WinXP. Many thanks.
Paul.
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