Unable to display graphs from Ubuntu 18.04, Sage 8.3, 64 bit PC

[Graham Gerrard]

I am using sage from a command prompt ...

show(line2d([(0,0),(1,1),(2,4)])) produces

/home/graham/SageMath/local/lib/python2.7/lib-tk/Tkinter.py in <module>()
     37     # Attempt to configure Tcl/Tk without requiring PATH
     38     import FixTk
---> 39 import _tkinter # If this fails your Python may not be configured for Tk
     40 tkinter = _tkinter # b/w compat for export
     41 TclError = _tkinter.TclError

ImportError: libtk8.6.so: cannot open shared object file: No such file or directory.

Any ideas?

Graham

[Jan Groenewald]

Hi

On Sat, 11 Aug 2018 at 15:38, Graham Gerrard <graham....@gmail.com> wrote:

I am using sage from a command prompt ...

show(line2d([(0,0),(1,1),(2,4)])) produces

/home/graham/SageMath/local/lib/python2.7/lib-tk/Tkinter.py in <module>()
     37     # Attempt to configure Tcl/Tk without requiring PATH
     38     import FixTk

---> 39 import _tkinter # If this fails your Python may not be configuredhttps://packages.ubuntu.com/search?keywords=tk&searchon=names&suite=bionic&section=all for Tk

     40 tkinter = _tkinter # b/w compat for export
     41 TclError = _tkinter.TclError

ImportError: libtk8.6.so: cannot open shared object file: No such file or directory.

Did you install from source? (versus from apt / software centre?)

http://doc.sagemath.org/html/en/installation/source.html#tcl-tk

So it looks like even if you just sudo apt install tk8.6 (and mabye tk8.6-blt2.5??)

your ubuntu python might pick it up but not the sage python.

So you should sudo apt install tk8.6-dev (and mabye tkblt-dev??)

and then rebuild the sage python as per the instructions at the link above.

tk packages in ubuntu 18.04:

https://packages.ubuntu.com/search?keywords=tk&searchon=names&suite=bionic&section=all

Or perhaps there is someone else who can answer if one can tell Sage not to try to use tk for

show(lines(... but to use another graphics toolkit.

Regards,

Jan

--

  .~.
  /V\     Jan Groenewald
 /( )\    www.aims.ac.za
 ^^-^^ 

[Graham Gerrard]

Hi Jan

I initially installed from the binary tarball.  Successfully tried

sudo apt install tk tk-dev

sage -f python2

Ubuntu18.04 seems to be missing several development tools.  So I guess this will all be resolved when a version of sage for 18.04 is formally released.

Many thanks for your help.

Graham

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[Vincent Delecroix]

Dear Graham,

Note that on Ubuntu 18.04 there is a sagemath and
sagemath-jupyter packages available in apt. They work
with the system Python and simplifies a lot installation.

Best
Vincent

>> sage-support...@googlegroups.com.

[Jan Groenewald]

Hi

I thought there were no binary tarballs for 18.04?
http://files.sagemath.org/linux/64bit/index.html

Regards,

Jan

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[Henri Girard]

Since ubuntu 17.10 I have seen this sagemath and jupyter-notebook which much simplifies  a good installation of sagemath

[Graham Gerrard]

Jan: Sorry, forgot to mention that I used the 16.04 tarball on 18.04.

Vincent: Tried installing sagemath using your recipe.  Works OK for my original problem.  However, have now reverted for several reasons...

(a) 8.1 not 8.3

(b) I usually add packages to the GAP pkg directory.  I didnt find such a directory.  sagemath structure looks very different.

(c) Seems slower than 16.04 tarball solution.

Graham

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[Vincent Delecroix]

Dear Graham

On 8/12/18 11:48 AM, Graham Gerrard wrote:
> Vincent: Tried installing sagemath using your recipe. Works OK for my
> original problem. However, have now reverted for several reasons...
> (a) 8.1 not 8.3

Indeed. That is the life of packages in a distribution such as
Debian/Ubuntu. You should have 8.3 packaged in few months. But you can
say the same with all packages there: LaTeX, gcc, etc. On the other
hand, Debian guarantees that all these packages live perfectly well
together.

> (b) I usually add packages to the GAP pkg directory. I didnt find such a
> directory. sagemath structure looks very different.

The SageMath on Debian/Ubuntu is using the GAP from the system. Which
means that any GAP package have to be installed from apt
(I don't know if GAP optional packages are available in apt).

Maybe, GAP also provides an alternative way of installing
packages in this situation.

The Sage binary is simple: put everything in one folder (including
Python and possibly gcc!!). The distribution way of thinking is
organized similarly to what you can see in $SAGE_ROOT/local

/usr/bin/ : binaries
/usr/lib/ : libraries
/usr/include/ : header files
/usr/share/ : extra files (eg documentation)

In the Debian way of thinking, it is Sage that is weird.

> (c) Seems slower than 16.04 tarball solution.

This is very weird. Do you have concrete examples (you can actually
measure the time taken by a command using the %time and %timeit
IPython magic).

Vincent

[Graham Gerrard]

Thanks for the helpful comments, Vincent.  Will try again with the official 18.04 version and "think" the Debian way.

Assume that no news is good news and that you have a happy customer.

Graham

[Henri Girard]

HI,
I would like to solve these equations but I don't know how ?

t_0=t_p==gamma*(t-V*x/c^2);show(t_0)
x_0=x_p==gamma*(x-V*t);show(x_0)

solve(t_0,gamma*(t-V*x/c^2))
desolve(gamma*(t-V*x/c^2)==0,x)

error desolve() takes at least 2 arguments (1 given)



Any help ?
Henri

[slelievre]

Dear Henri,

please start a new thread rather than asking a question as a reply

to an unrelated thread.

Kind regards,

Samuel

[slelievre]

On Sun 2018-08-12, 20:26:15 UTC+2, Graham Gerrard wrote:

>

> Thanks for the helpful comments, Vincent. Will try again

> with the official 18.04 version and "think" the Debian way.

> Assume that no news is good news and that you have a happy customer.

Note that other ways to install SageMath under Ubuntu exist.

You could, among other ways,

- use the conda package

- use a Docker image

- use the Nix package

Also, if you like to have the latest version, building from source

is not all that hard.

See the "Distribution" page on the Sage wiki for more information.

https://wiki.sagemath.org/Distribution

[HG]

I installed a fresh cosmic ubuntu 18.10 which should be ready in two weeks about, sage-8.3 is in the repo and is working well