thank you, Simon
>
> many computational aspects, but still human insight is needed to break a
> problem up into sub-problems of chewable size, or transform the original
> problem into one that is more accessible to automatic solutions. And
> even if a computer algebra system (no matter which o
> > In fact, the solution is: w=t+t^2
>
> Are you sure? Assuming some value for t, plotting the expression
> doesn't seem to show a solution at w = t + t^2.
>
I am sorry. I made a mistake.
> best
>
> Robert Dodier
>
>
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Thanks to Emmanuel Charpentier for the solution.
But the trick is S1[0]^2 that needs human works.
Le samedi 18 octobre 2014 11:58:37 UTC+2, Emmanuel Charpentier a écrit :
>
> Well, after a bit of sleep, the solution was (semi-)obvious :
>
> sage: var("w,t")
> (w, t)
> sage: E1=-(1/2*sqrt((4*w+1)+1
solve does not solve ?
sage: solve(-(1/2*sqrt((4*w+1)+1))*t+w==0,w)
[w == 1/2*sqrt(4*w + 2)*t]
In fact, the solution is: w=t+t^2
What is wrong ? Thank you for any help.
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Thank you for finding the exact version having the determinant problem.
Maybe we can compare the source codes of those two versions
to solve the problem.
Le mardi 13 novembre 2012 23:59:21 UTC+1, platane a écrit :
>
> In Sage 5.4 determinant for dense matrix is very slow. For the fol
In Sage 5.4 determinant for dense matrix is very slow. For the following Hankel
determinant calculation, Sage 4.6.1 is 10 time more fast than Sage 5.4 (!!):
Sage 5.4, Sparse = False, Time=117.49
Sage 4.6.1, Sparse=False, Time=0.0011
#
import time
def test(K, SP):
n=1
I have the same problem. Some thing is wrong in Sage 5.4.
You could use sparse=True to calculate the determinant, but Sage 4.6.1 is much
better. For my hankel determinant:
K = 30 , result = -9
Sage Version 5.4, Release Date: 2012-11-09
sparse= True
time = 0.00843095779419
K = 30 , r
