Re: [R] A question in Rinternals.h

2014-08-19 Thread PO SU
BTW, you say i always send html format email, finally i find that it is my mail server which send mail in html format by default., i should change the format eveytime before sending a mail... -- PO SU mail: desolato...@163.com Majored in Statistics from SJTU At 2014-08-19 06:28:06,

Re: [R] A question in Rinternals.h

2014-08-19 Thread PO SU
Tks for your guide, but before i know which maillist should i ask the question, i could only ask it here. 'figure out' i mean 'understand'. Forgive my pool english :). -- PO SU mail: desolato...@163.com Majored in Statistics from SJTU At 2014-08-19 06:28:06, "Prof Brian Ripley" wrote: >P

Re: [R] A question in Rinternals.h

2014-08-19 Thread Prof Brian Ripley
Please do read the posting guide (clearly you have not as you sent HTML). - This is the wrong list: it is a question about C code. - In any case, it is about C. The R Internals manual may help you, otherwise you need to talk to a local C adviser. (Even if this were not off-topic here, we do

[R] A question in Rinternals.h

2014-08-19 Thread PO SU
Dear Rusers, when i am reading Rinternals.h file, i can't understand the following codes in lines 395-407: #define CHAR(x)R_CHAR(x) const char *(R_CHAR)(SEXP x); /* Various tests with macro versions below */ Rboolean (Rf_isNull)(SEXP s); Rboolean (Rf_isSymbol)(SEXP s); Rboolean (Rf_isLogic