How does one "solve" an inequality?
hum, maybe 'solve' is not the right word, sorry... for now, using lsolve(), I can make GiNaC answer "x == -y" for equality "x+y == 0" (looking at 'x'). My question is : if I'm looking for 'x', in the inequality " x+y < 0", how can GiNaC give me "x < -y" ? cheers Fred 2010/3/19 Harish Narayanan <harish.mlists@gmail.com>:
On 3/19/10 12:31 AM, Frederic wrote:
Hi,
I'm new here, I only test GiNaC to see how it can help me. What I've seen of it so far with is very nice, especially C++ objects (no need to parse strings).
But I don't see how to solve inequalities : x+y < 0
lsolve tells me : terminate called after throwing an instance of 'std::invalid_argument' what(): lsolve(): 1st argument must be a list of equations
it works just fine with real equalities (replaced the '<' by '==' ): x+y == 0
I use GiNaC 1.5.2 on a 64b ubuntu system. But I haven't seen anything related on newer version's changelog.
can GiNaC solve inequalities ? If yes, how ?!? and if no, why ? is it planned ?
thanks in advance for any input...
How does one "solve" an inequality?
Harish