[R] .C and character

Douglas Bates bates at stat.wisc.edu
Thu Mar 25 16:11:47 CET 1999

>>>>> "Torsten" == Torsten Hothorn <hothorn at amadeus.statistik.uni-dortmund.de> writes:

  Torsten> Hi, I had a problem passing characters from R into c-code
  Torsten> by dyn.load() and .C().

  Torsten> test1.c: void R2Cstr(char *str) { printf("\n my char: %s
  Torsten> \n", str[0]); }

You must declare str as char **str.  The basic character vector in R
is a vector of strings, not a vector of characters.  Notice that the
way you are printing it assumes that str[0] is char *, not char.
If you change your example to

	void R2Cstr(char **str)
		printf("\n my char: %s \n", str[0]);

	.C("R2Cdouble", as.character("test"));

it should work.
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