It is difficult to know before the fact which library will returnthe
expected result. Consider :
```
sage: var("x, a, b")
(x, a,
b)
sage: dgamma(x, a, b)=x^(a-1)*(1-x)^(b-1)/beta(a, b)
sage: with assuming(a>0, b>0): dgamma(x, a, b).integrate(x,0,1)
1
This is quasi-immediate. And of course so
On 12/18/20 9:53 AM, Dima Pasechnik wrote:
isn't pynac/ginac used a lot?
At least for symbolic integration, the current list in
symbolic/integration/integral.py is,
self.integrators = [external.maxima_integrator,
external.giac_integrator,
externa
isn't pynac/ginac used a lot?
On Fri, 18 Dec 2020, 14:35 Michael Orlitzky, wrote:
> On 12/18/20 2:55 AM, Sébastien Labbé wrote:
> >
> > Why do we use maxima first as opposed to giac/sympy? Is it because it is
> > faster than giac/sympy? Is it because it returns answers that are
> > correct but f
On 12/18/20 2:55 AM, Sébastien Labbé wrote:
Why do we use maxima first as opposed to giac/sympy? Is it because it is
faster than giac/sympy? Is it because it returns answers that are
correct but for which giac/sympy returns incorrect results?
I personally have never tried it because I'm afra
> There is still a lot of room for improvement. SymPy could be tried first
> when integrating expressions containing an absolute value, for one. We
> already _fall back_ to giac/sympy if maxima throws an error; but when it
> simply returns garbage, the problem goes unnoticed.
>
Why do we use
On 3/18/20 11:48 AM, Michael Jung wrote:
Dear fellow developers,
I've encountered a really strange result in Sage while using Maxima.
|
sage:f(x,y)=(x^2-y^2)/(x^2+y^2)^2
sage:integrate(integrate(abs(f(x,y)),x,0,1),y,0,1)
-1/4*pi
|||
This is really weird. At least, the result should be positiv
Dear fellow developers,
I've encountered a really strange result in Sage while using Maxima.
sage: f(x,y) = (x^2-y^2)/(x^2+y^2)^2
sage: integrate(integrate(abs(f(x,y)), x, 0, 1), y, 0, 1)
-1/4*pi
This is really weird. At least, the result should be positive! SymPy
however yields th
Dear fellow developers,
I've encountered a really strange result in Sage while using Maxima.
|
sage:f(x,y)=(x^2-y^2)/(x^2+y^2)^2
sage:integrate(integrate(abs(f(x,y)),x,0,1),y,0,1)
-1/4*pi
|
This is really weird. At least, the result should be positive! SymPy
however yields the correct result:
