Hello everyone,
I am new to sage (thanks for it ! it looks excellent !) and have been
trying to re-factor some long expressions.
As an example :
sage: var('x,y,a,b,c,d')
(x, y, a, b, c, d)
sage: T=expand((x^2+y^2)*(a*b+a^2-2*d*c+c^2-3*b^2));T
a^2*x^2 + a^2*y^2 + a*b*x^2 + a*b*y^2 - 3*b^2*x^2 - 3*b^2*y^2 +
c^2*x^2 + c^2*y^2 - 2*c*d*x^2 - 2*c*d*y^2
sage: T.collect(x^2+y^2)
a^2*x^2 + a^2*y^2 + a*b*x^2 + a*b*y^2 - 3*b^2*x^2 - 3*b^2*y^2 +
c^2*x^2 + c^2*y^2 - 2*c*d*x^2 - 2*c*d*y^2
I've played a bit and got lost in the doc... but could not find a way
to have sage re-factor a given sub-expression out.
(also it seems that T.coeffs(x^2+y^2) makes sage hanging...)
Thanks for any help !
Cheers,
P.A.
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