sage_eval(('f(x) = (x^2-1)/(x-1)','f(1.000000000000001)')) does not work

[jmarcell...@ufpi.edu.br]

Hello everyone.

I want to use the command :

sage_eval(('f (x) = (x ^ 2-1) / (x-1)', 'f (1.000000000000001)'))

but not at work sagecloud, only in the local sage.

[William Stein]

You will have to wait until we upgrade SageMathCloud to use the newest
version of Sage, or type in a terminal

mkdir -p ~/bin; cd ~/bin; ln -s /usr/local/bin/sage-develop sage

and restart your project to use the latest develop version of Sage,
which has an extended version of sage_eval that works as you expect.

William


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Best Regards,
William Stein

CEO, SageMath, Inc.

[jmarcell...@ufpi.edu.br]

hello Willian

I type it in a terminal

mkdir -p ~/bin; cd ~/bin; ln -s /usr/local/bin/sage-develop sage

and restarted the project but still with the same result.

sage_eval(('f (x) = (x ^ 2-1) / (x-1)', 'f (1.000000000000001)'))

       ('f (x) = (x ^ 2-1) / (x-1)', 'f (1.000000000000001)')

version()
      'SageMath version 7.4.beta0, Release Date: 2016-08-10'

[William Stein]

On Tue, Aug 16, 2016 at 12:52 PM, <jmarcell...@ufpi.edu.br> wrote:
> hello Willian
>
> I type it in a terminal
> mkdir -p ~/bin; cd ~/bin; ln -s /usr/local/bin/sage-develop sage
>
> and restarted the project but still with the same result.
>
> sage_eval(('f (x) = (x ^ 2-1) / (x-1)', 'f (1.000000000000001)'))
>
> ('f (x) = (x ^ 2-1) / (x-1)', 'f (1.000000000000001)')
>
>
> version()
> 'SageMath version 7.4.beta0, Release Date: 2016-08-10'

You can revert that ~/bin/ change, i.e., remove the link if you want.

Instead, put this in your worksheet and try again:

def sage_eval(x, locals=None):
if isinstance(x, str):
x = str(x).strip()
if x.isspace():
return None
from sage.all import sage_eval
return sage_eval(x, locals=locals)


See
https://github.com/sagemathinc/smc/issues/825

> https://groups.google.com/d/msgid/sage-cloud/47847e34-a241-4db7-9039-1c617d1d8ecb%40googlegroups.com.

[João Marcello Pereira]

Hi Willain

It worked! Thank you ;)