Re: [sage-support] Re: numerical simplification

[Karima Shahzad]

Thank you, but the issue is solved using different command


On Tue, Jul 28, 2020 at 2:27 PM Vincent Delecroix <20100.delecr...@gmail.com>
wrote:

> One solution is to map the expression into
> polynomial expressions with variable 'a' and
> 'r' over the floating point numbers
>
> sage: a,r = SR.var('a,r');
> sage: expr = ((sqrt(2)*a-2*r)/(2+2*sqrt(2)))
> sage: RDF['a,r'](expr)
> 0.2928932188134525*a - 0.4142135623730951*r
>
> (this is not very robust as it would fail for something
> like cos(sqrt(2) + r))
>
> Vincent
>
> Le 28/07/2020 à 11:24, Bert Henry a écrit :
> >
> >
> > Am Dienstag, 28. Juli 2020 11:13:49 UTC+2 schrieb JJS137:
> >>
> >> Have you tried canonicalize_radical() ?
> >> Cheers,
> >> John
> >>
> >>
> > Yes, but it doesn't solve the problem
> >
>
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Re: [sage-support] Re: numerical simplification

[Bert Henry]

Am Dienstag, 28. Juli 2020 10:17:20 UTC+2 schrieb Karima Shahzad:
>
> I am sorry, what is it?
>
>
> On Tue, Jul 28, 2020 at 11:12 AM Bert Henry  > wrote:
>
>> Sorry for writing uncomplete formula. Here it is better
>>
>> (sqrt(2)*a-2*r)/(2+2*sqrt(2))
>>
>> Thanks
>> Bert
>>
>>

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Re: [sage-support] Re: numerical simplification

[Vincent Delecroix]

One solution is to map the expression into
polynomial expressions with variable 'a' and
'r' over the floating point numbers

sage: a,r = SR.var('a,r');
sage: expr = ((sqrt(2)*a-2*r)/(2+2*sqrt(2)))
sage: RDF['a,r'](expr)
0.2928932188134525*a - 0.4142135623730951*r

(this is not very robust as it would fail for something
like cos(sqrt(2) + r))

Vincent

Le 28/07/2020 à 11:24, Bert Henry a écrit :



Am Dienstag, 28. Juli 2020 11:13:49 UTC+2 schrieb JJS137:


Have you tried canonicalize_radical() ?
Cheers,
John



Yes, but it doesn't solve the problem



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Re: [sage-support] Re: numerical simplification

[Bert Henry]

Am Dienstag, 28. Juli 2020 11:13:49 UTC+2 schrieb JJS137:
>
> Have you tried canonicalize_radical() ?
> Cheers,
> John
>
>
Yes, but it doesn't solve the problem 

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Re: [sage-support] Re: numerical simplification

[Karima Shahzad]

sudo update-alternatives --install /usr/bin/python python
/usr/bin/python3.7
The above command solved my problem, and I installed Sage successfully,
Thanks to your support team and special thanks to Dima Pasechnik.

On Tue, Jul 28, 2020 at 2:13 PM John Spitzer  wrote:

> Have you tried canonicalize_radical() ?
> Cheers,
> John
>
>
> On Tue, 28 Jul 2020 at 18:17, Karima Shahzad 
> wrote:
>
>> I am sorry, what is it?
>>
>>
>> On Tue, Jul 28, 2020 at 11:12 AM Bert Henry  wrote:
>>
>>> Sorry for writing uncomplete formula. Here it is better
>>>
>>> (sqrt(2)*a-2*r)/(2+2*sqrt(2))
>>>
>>> Thanks
>>> Bert
>>>
>>> Am Montag, 27. Juli 2020 20:28:14 UTC+2 schrieb Bert Henry:

 How can I get from

 2(2​+1)2​a−a​


 the numerical term

 0.2929a - 0.4142r

 Thanks in advance
 Bert

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>>
>
>
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>
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Re: [sage-support] Re: numerical simplification

[John Spitzer]

Have you tried canonicalize_radical() ?
Cheers,
John


On Tue, 28 Jul 2020 at 18:17, Karima Shahzad 
wrote:

> I am sorry, what is it?
>
>
> On Tue, Jul 28, 2020 at 11:12 AM Bert Henry  wrote:
>
>> Sorry for writing uncomplete formula. Here it is better
>>
>> (sqrt(2)*a-2*r)/(2+2*sqrt(2))
>>
>> Thanks
>> Bert
>>
>> Am Montag, 27. Juli 2020 20:28:14 UTC+2 schrieb Bert Henry:
>>>
>>> How can I get from
>>>
>>> 2(2​+1)2​a−a​
>>>
>>>
>>> the numerical term
>>>
>>> 0.2929a - 0.4142r
>>>
>>> Thanks in advance
>>> Bert
>>>
>> --
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>> 
>> .
>>
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Re: [sage-support] Re: numerical simplification

[Karima Shahzad]

I am sorry, what is it?


On Tue, Jul 28, 2020 at 11:12 AM Bert Henry  wrote:

> Sorry for writing uncomplete formula. Here it is better
>
> (sqrt(2)*a-2*r)/(2+2*sqrt(2))
>
> Thanks
> Bert
>
> Am Montag, 27. Juli 2020 20:28:14 UTC+2 schrieb Bert Henry:
>>
>> How can I get from
>>
>> 2(2​+1)2​a−a​
>>
>>
>> the numerical term
>>
>> 0.2929a - 0.4142r
>>
>> Thanks in advance
>> Bert
>>
> --
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> 
> .
>

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[sage-support] Re: numerical simplification

[Bert Henry]

Sorry for writing uncomplete formula. Here it is better

(sqrt(2)*a-2*r)/(2+2*sqrt(2))

Thanks
Bert

Am Montag, 27. Juli 2020 20:28:14 UTC+2 schrieb Bert Henry:
>
> How can I get from
>
> 2(2​+1)2​a−a​
>
>
> the numerical term
>
> 0.2929a - 0.4142r
>
> Thanks in advance
> Bert
>

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