Re: [GiNaC-list] arithmetic error on concat two expressions

Kraus Philipp wrote:

Thanks, I see it, but if I create a derivatrion "diff" the sign is important: If I run formula.diff(a, 1):

[0.5*(t-ax^3)^2]' => -(t-a*x^3)*x^3 [0.5*(ax^3-t)^2]' => (a*x^3-t)*x^3

Those two formulae are mathematically equivalent. -(u-v)=(v-u).