R help - Oct 2003 - Simplex "Out of Bounds" Error

I am running the following code (testing the use of the simplex function to 
determine if a point is in the convex hull of another set of points or not):
>a <- c(0, 0)
>A3 <-matrix(c(1,2,3,4,1,1), ncol = 2, byrow = T)
>b3 <-c(1.5, 3.5, 1)
>simplex(a = a, A3 = A3, b3 = b3)
and the following error message appears:
 Error in simplex1(out1$a[1:(n + m1 + m2)], out1$A[, 1:(n + m1 + m2)],  : 
        subscript out of bounds

Any advice on why this error is appearing and how to avoid it?  (Particularly 
the latter?)  In terms of the convex hull problem, this error seems to occur 
when the point in question (in the convex hull or not) is on the edge/surface 
of the convex hull.  But I'm not positive about this.  

Thanks in advance.

(I've noticed a few other posts of this problem, but never saw anyone
reply.)

On Sat, 11 Oct 2003 hstoll at latte.harvard.edu wrote:
> I am running the following code (testing the use of the simplex function to
> determine if a point is in the convex hull of another set of points or
not):
> 
> >a <- c(0, 0)
> >A3 <-matrix(c(1,2,3,4,1,1), ncol = 2, byrow = T)
> >b3 <-c(1.5, 3.5, 1)
> >simplex(a = a, A3 = A3, b3 = b3)
> 
> and the following error message appears:
>  Error in simplex1(out1$a[1:(n + m1 + m2)], out1$A[, 1:(n + m1 + m2)],  : 
>         subscript out of bounds
> 
> Any advice on why this error is appearing and how to avoid it? 
(Particularly
> the latter?)  In terms of the convex hull problem, this error seems to
occur
> when the point in question (in the convex hull or not) is on the
edge/surface
> of the convex hull.  But I'm not positive about this.  
> 
> Thanks in advance.
> 
> (I've noticed a few other posts of this problem, but never saw anyone
reply.)
I assume this is function simplex() in package boot, although you did not
say so.  If so, did you contact the author (and not the maintainer) who
may well not read R-help but is the person most likely to be able to 
supply a fix?

-- 
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