plotting ln(x) graph on sagemath

[Anoz]

I'm trying to plot the graph ln(1+x/1-x) how do I do this on sagemath , I just need the correct syntax.

[William Stein]

On Sat, Sep 17, 2016 at 1:59 PM, Anoz <zona....@gmail.com> wrote:

I'm trying to plot the graph ln(1+x/1-x) how do I do this on sagemath , I just need the correct syntax.

plot(log((1+x)/(1-x)), (x, -1,1))

See

  https://cloud.sagemath.com/projects/4a5f0542-5873-4eed-a85c-a18c706e8bcd/files/support/2016-09-17-152522-log-plot.sagews 

[jack]

On Saturday, 17 September 2016 17:13:05 UTC-4, Anoz wrote:

I'm trying to plot the graph ln(1+x/1-x) how do I do this on sagemath , I just need the correct syntax.

I have just tried this on my newly installed sage7.3 on my new computer with Ubuntu16.04. 

P=plot(log((1+x)/(1-x)), (x, -1,1))

print(P)

gives 

Graphics object consisting of 1 graphics primitive

show(P)

gives a lengthy error message which ends with

ImportError: cannot import name scimath

I installed sage at /home/jack/Tools

One clue might be the initial message I get on initiating sage in a terminal. It reads:

****************************************

sys:1: RuntimeWarning: not adding directory '' to sys.path since everybody can write to it.

Untrusted users could put files in this directory which might then be imported by your Python code. As a general precaution from similar exploits, you should not execute Python code from this directory

*****************************************

Since I am the only user of this desktop computer I am not too concerned :-)

Best regards to the sage community,

                                                          Jack Fearnley

[Jori Mäntysalo]

On Sun, 18 Sep 2016, jack wrote:

> Ubuntu16.04. 

> P=plot(log((1+x)/(1-x)), (x, -1,1))

> show(P)
> gives a lengthy error message which ends with
> ImportError: cannot import name scimath
>
> I installed sage at /home/jack/Tools
>
> One clue might be the initial message I get on initiating sage in a
> terminal. It reads:
>
> ****************************************
> sys:1: RuntimeWarning: not adding directory '' to sys.path since everybody
> can write to it.

I have no real clue, but I would start with

strace -e file ./sage 2> log-f

then write

plot(sin)

or something similar and then quit Sage. After that

fgrep tmp_ log-f

shows

open(".../.sage/temp/j-op7010/12072/tmp_n3Sn3X.png", ...) = 11

etc. and

fgrep EACCESS log-f

finds nothing.

--
Jori Mäntysalo

[HG]

Maybe fist write %matplotlib inline
Sometimes I got the same problem
I do it first with python2 kernel and after I do it with sagemath again

[HG]

On mine sage 7.3 it does it straight

Le samedi 17 septembre 2016 23:13:05 UTC+2, Anoz a écrit :

[HG]

syntax should be show(P)

or P

but not print P which gives you your result

Le samedi 17 septembre 2016 23:13:05 UTC+2, Anoz a écrit :