[sage-support] doc about combinatoric and graphs

[Henri Girard]

Hi,

I want to learn combinatoric and graphs with sage, I found few doc on 
web, but not really for beginners, I am a true "beginner" so any idea is 
welcome, I would prefer doc in french but I found only in english, so 
reading is not easy (but not impossible).


Kind regards

Henri

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Re: [sage-support] ipywidgets and sage

[Marcin Kostur]

OK it works fine, with 7.1.1(sagemath) and 7.1.2(anaconda)

thanks

mk

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[sage-support] Re: Find_root not finding a root

[Marcin Kostur]

Dear Saad,

It happens that I want to find more than one root numerically, then I use 
brute force as in code below. It is not possible to 
have any general heuristics for arbitrary function about where its roots 
are, so if one knows more about the function in some special case
 then the interval generation can be adapted to reflect this knowledge.

zeros = []
xmin = -1
xmax = 1
f = sin(1/x)-x
intv = srange(xmin,xmax,(xmax-xmin)/150)
for x1,x2 in zip(intv,intv[1:]):
try:
rt = find_root(f,x1,x2 )
zeros.append(rt)
except:
pass

That is all.

mk


On Monday, March 19, 2018 at 9:45:53 PM UTC+1, saad khalid wrote:
>
> So what is likely the difference between how Sage solves this problem and 
> how Mathematica solves this problem that makes Mathematica show more 
> solutions? 
>
> On Friday, March 16, 2018 at 4:31:33 AM UTC-5, Dima Pasechnik wrote:
>>
>> This makes sense. It most probably has a pre-set minimal interval length, 
>> so it stops splitting at certain moment.
>
>

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[sage-support] Re: Mixing cython and Sage code

[Ralf Stephan]

On Wednesday, March 21, 2018 at 7:29:37 PM UTC+1, saad khalid wrote:
>
> ...For example, one of the Mathematica functions takes a polynomial in 2 
> variables as input and computes the value of the order in one of the 
> variables (ie for x1^3 + x1*x2^2 + x2, the order for x1 would be 3).
>

Not discouraging your efforts but did you try poly.degree(x1)?

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[sage-support] Re: doc about combinatoric and graphs

[slelievre]

Le vendredi 23 mars 2018 08:07:52 UTC+1, HG a écrit :
>
> I want to learn combinatoric and graphs with sage, I found few doc on 
> web, but not really for beginners, I am a true "beginner" so any idea is 
> welcome, I would prefer doc in french but I found only in english, so 
> reading is not easy (but not impossible). 

The book "Calcul mathématique avec Sage" is an excellent
resource for that. The original version is in French.
Translations to English and German exist, and a translation
to Spanish is in progress, if I remember correctly.

See the book's webpage:

http://sagebook.gforge.inria.fr

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Re: [sage-support] Re: doc about combinatoric and graphs

[Henri Girard]

thanks i got it


Le 23/03/2018 à 18:20, slelievre a écrit :

Le vendredi 23 mars 2018 08:07:52 UTC+1, HG a écrit :
>
> I want to learn combinatoric and graphs with sage, I found few doc on
> web, but not really for beginners, I am a true "beginner" so any 
idea is

> welcome, I would prefer doc in french but I found only in english, so
> reading is not easy (but not impossible).

The book "Calcul mathématique avec Sage" is an excellent
resource for that. The original version is in French.
Translations to English and German exist, and a translation
to Spanish is in progress, if I remember correctly.

See the book's webpage:

    http://sagebook.gforge.inria.fr
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