[Symphony] RSymphony appcrash

[Ashutosh Mahajan]

Vladyslav,

What version of symphony are you using?

You could try passing an option to Symphony that increases its verbosity, to
say 5 or 10, andand send us the output. In a 'C' interface you could do it by
sym_set_int_param(env, "verbosity", 10);

I don't know how you can do it in 'R'. I see that symphony is able to solve
this particular MILP in the presolver, if I run it directly (without R) using
your inputs. 

--
regards
Ashutosh Mahajan
http://coral.ie.lehigh.edu/~asm4

On Thu, Jan 06, 2011 at 04:14:14PM +0200, Vladyslav Kolbasin wrote:
> 
> 
>    Hi list,
> 
>    I use Symphony under R (use RSymphony package).
>    Please tell me why sometimes RSymphony.dll crashes on Windows 7 (may be on
>    other Windows too).
> 
>    I saw that it depends on input data. For example this code bring to crash:
> 
>    library('Rsymphony')
>    mat = c(0, 1, -100.37967, 0, 0,   1, 0, 0, -200, 0,   0, 1, -0.4, 0, 0,
>    1, 0, 0, -0.4, 0,   0.5, 0, 0, 0, 0,   0, -1, 0, 0, 0)
>    mat = matrix(mat, nrow=6, byrow=TRUE)
>    mat
> 
>    dir = c("<=", "<=", ">=", ">=", "==", "==")
>    rhs = rep(0, 6)
>    obj = c(1, 1, 1, 1, 1)
>    types = c("C", "C", "B", "B", "B")
>    bounds = NULL
> 
>    solution<-Rsymphony_solve_LP(obj,mat,dir,rhs, bounds=bounds, types=types,
>    max = TRUE)
>    solution
> 
>    Sometimes crashes not RSymphony.dll module but ntdll.dll - don't know how
>    exactly repeat this crash.
> 
>    Best, Vladyslav

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