[Rd] Problem with rnorm ?

[Tong Wang]

It's working , Thanks a lot !!!

tong

----- Original Message -----
From: Prof Brian Ripley <ripley at stats.ox.ac.uk>
Date: Saturday, May 12, 2007 4:27 am
Subject: Re: [Rd] Problem with rnorm ?
To: Tong Wang <wangtong at usc.edu>
Cc: R-devel <r-devel at r-project.org>

> 1) You are linking an executable against -lR.  You can't do that as 
> here,for R is never initialized (and I very much doubt you will be 
> able to 
> give a reference that recommended you to do that).  You need to 
> link 
> against standalone libRmath, or start up R properly if you really 
> need R.
> 
> 2) The arguments to rnorm() are doubles, not integers: did you not 
> get a 
> warning?  I would expect automatic conversion to occur, but it is 
> better 
> to get this right.
> 
> On Fri, 11 May 2007, Tong Wang wrote:
> 
> > Hi,
> >    I couldn't get the rnorm() work right in C, for example, the 
> following code produce strange results.
> >
> > #include <stdio.h>
> > #include <Rmath.h>
> >
> > int main(void){
> >  double x[3];
> >  for(int i=0;i<3;i++)  x[i]=rnorm(0,1);
> >  printf("%lf,%lf,%lf",x[0],x[1],x[2]);
> >  return 0;
> > }
> >
> > output :   -8.773321,-8.773321,-8.773321
> > compiling script:   gcc -std=gnu99  -Wall -IC:/PROGRA~1/R/R-
> 24~1.1/include test.c -LC:/PROGRA~1/R/R-24~1.1/bin -lR -o test
> >
> > Could someone tell me what's wrong with my code ? Thanks a lot.
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
> 
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>