-------- Original Message -------- Subject: Re: [PPL-devel] Linear constraint solving example with floating point co-efficients Date: Wed, 24 Aug 2011 02:55:32 -0400 From: Mahesh Nanjundappa <knmahesh@vt.edu> To: Roberto Bagnara <bagnara@cs.unipr.it> Hello Dr. Bagnara, Sorry if I bothered you and thanks for getting back to me despite your busy schedule. I've been going through the documentation and the sample examples from past 2 days. My purpose is more than the solving the linear system. But frankly speaking, I've not been to get any simple example compiled with floating point coefficients. I was looking for a pointer to any example which is solved with floating point coefficients. Again, thanks for getting back to me. Regards, Mahesh On Wed, Aug 24, 2011 at 2:34 AM, Roberto Bagnara <bagnara@cs.unipr.it <mailto:bagnara@cs.unipr.it>> wrote: On 08/23/11 15:31, Mahesh Nanjundappa wrote: Hi all, Please don't feel annoyed by this request. I did try for looking for examples in the folder I downloaded and in the manual. But couldnt find what I was looking for. I'm looking for a simple example where a linear constraint system with floating point coefficients (variables can also take floating point values) is solved and output is printed to either file or stdout. I don't have strict requirement to number of decimal points it has to be accurately computed. I'm fine with just 2 decimal points. The system can be as simple as this, 1.2*x + 2.3y <= 8.2 2.2*x + 1.4*y <= 7.1 This one example I tried out but with integer coefficients. #include <ppl.hh> #include "ppl_c.h" using namespace Parma_Polyhedra_Library; int main() { Variable x(0); Variable y(1); Constraint_System CS; Linear_Expression LE1 = 1*x + 2*y; Linear_Expression LE2 = 2*x + 1*y; CS.insert(LE1 <= 7); CS.insert(LE2 <= 5); C_Polyhedron P(CS); return 0; } It would be great if someone can help me out with this by providing an example or code for the system I described earlier. Thanks in advance, Mahesh Hi Mahesh. There is really no way you can use the PPL without even looking at its documentation. Good luck, Roberto -- Prof. Roberto Bagnara Applied Formal Methods Laboratory Department of Mathematics, University of Parma, Italy http://www.cs.unipr.it/~__bagnara/ <http://www.cs.unipr.it/~bagnara/> mailto:bagnara@cs.unipr.it <mailto:bagnara@cs.unipr.it>