Re: [R-pkg-devel] Unable to access log operator in C
Thank you, Dirk.
However, I am an absolute clod.I just realized; I was passing in the
SEXP indicating whether or not to log the function as "log", so I
"overwrote" the symbol.
Excuse me while I go bang my head into the wall a few dozen times.
My apologies,
Avi
On Wed, Feb 28, 2024 at 7:14 PM Dirk Eddelbuettel wrote:
>
>
> On 28 February 2024 at 19:05, Avraham Adler wrote:
> | I am hoping the solution to this question is simple, but I have not
> | been able to find one. I am building a routine in C to be called from
> | R. I am including Rmath.h. However, when I have a call to "log", I get
> | the error "called object 'log' is not a function or a function
> | pointer. When I "trick" it by calling log1p(x - 1), which I *know* is
> | exported from Rmath.h, it works.
> |
> | More completely, my includes are:
> | #include
> | #include
> | #include
> | #include
> | #include // for NULL
> | #include
> |
> | The object being logged is a double, passed into C as an SEXP, call it
> | "a", which for now will always be a singleton. I initialize a pointer
> | double *pa = REAL(a). I eventually call log(pa[0]), which does not
> | compile and throws the error listed above. Switching the call to
> | log1p(pa[0] - 1.0) works and returns the proper answer.
> |
> | Even including math.h explicitly does not help, which makes sense as
> | it is included by Rmath.h.
>
> Can you show the actual line? Worst case rename your source file to end in
> .cpp, include and call std::log.
>
> > Rcpp::cppFunction("double mylog(double x) { return std::log(x); }")
> > mylog(exp(42))
> [1] 42
> >
>
> Dirk
>
> --
> dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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Re: [R-pkg-devel] Unable to access log operator in C
On 28 February 2024 at 19:05, Avraham Adler wrote:
| I am hoping the solution to this question is simple, but I have not
| been able to find one. I am building a routine in C to be called from
| R. I am including Rmath.h. However, when I have a call to "log", I get
| the error "called object 'log' is not a function or a function
| pointer. When I "trick" it by calling log1p(x - 1), which I *know* is
| exported from Rmath.h, it works.
|
| More completely, my includes are:
| #include
| #include
| #include
| #include
| #include // for NULL
| #include
|
| The object being logged is a double, passed into C as an SEXP, call it
| "a", which for now will always be a singleton. I initialize a pointer
| double *pa = REAL(a). I eventually call log(pa[0]), which does not
| compile and throws the error listed above. Switching the call to
| log1p(pa[0] - 1.0) works and returns the proper answer.
|
| Even including math.h explicitly does not help, which makes sense as
| it is included by Rmath.h.
Can you show the actual line? Worst case rename your source file to end in
.cpp, include and call std::log.
> Rcpp::cppFunction("double mylog(double x) { return std::log(x); }")
> mylog(exp(42))
[1] 42
>
Dirk
--
dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
__
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[R-pkg-devel] Unable to access log operator in C
I am hoping the solution to this question is simple, but I have not been able to find one. I am building a routine in C to be called from R. I am including Rmath.h. However, when I have a call to "log", I get the error "called object 'log' is not a function or a function pointer. When I "trick" it by calling log1p(x - 1), which I *know* is exported from Rmath.h, it works. More completely, my includes are: #include #include #include #include #include // for NULL #include The object being logged is a double, passed into C as an SEXP, call it "a", which for now will always be a singleton. I initialize a pointer double *pa = REAL(a). I eventually call log(pa[0]), which does not compile and throws the error listed above. Switching the call to log1p(pa[0] - 1.0) works and returns the proper answer. Even including math.h explicitly does not help, which makes sense as it is included by Rmath.h. Thank you, Avi __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
