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20161005 08:06:34 0500
 commented answer  Axes labels on 3D plots? @eric_g could you please provide a working example of set_axes_labels usage? Thx 
20161005 04:46:49 0500
 commented answer  plot error: No X11 DISPLAY variable was set 
20161005 04:24:47 0500
 commented answer  plot error: No X11 DISPLAY variable was set 
20161005 03:24:03 0500
 asked a question  plot error: No X11 DISPLAY variable was set Hi, I have to make a plot of the following formula x,y=var('x, y')
plot3d((x^2)*yx*y+x*y^3,0,5)
but I obtain error message /usr/lib64/python2.7/sitepackages/sage/plot/plot3d/parametric_plot3d.py\
:704: DeprecationWarning: Unnamed
ranges for more than one variable is
deprecated and will be removed from a
future release of Sage; you can used
named ranges instead, like (x,0,2) See
http://trac.sagemath.org/7008 for
details. g, ranges =
setup_for_eval_on_grid(f,
[urange,vrange], plot_points)
Exception in thread "main"
java.lang.ExceptionInInitializerError
Caused by: java.awt.HeadlessException:
No X11 DISPLAY variable was set, but
this program performed an operation
which requires it. at
sun.awt.HeadlessToolkit.getScreenSize(HeadlessToolkit.java:284)
at
org.openscience.jmol.app.jmolpanel.JmolPanel.<clinit>(JmolPanel.ja\
va:173)
/usr/lib64/python2.7/sitepackages/sage/repl/rich_output/display_manager\
.py:570: RichReprWarning: Exception in
_rich_repr_ while displaying object: Jmol failed to create file
'/home/sage/.sage/temp/host/1582/dir_0OP2db/preview.png',
see
'/home/sage/.sage/temp/host/1582/tmp_4sBlqC.txt'
for details RichReprWarning,
Graphics3d Object</clinit> 
20160913 18:41:40 0500
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20151230 09:12:07 0500
 asked a question  Run LCM fractions I am doing some matrix multiplications, and as result I get Now see position 1,1 of the matrix: I want SageMath to return me a result that has only one fraction (using LCM), not two fractions. Which command should I use? 
20151020 00:44:16 0500
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20150921 05:03:08 0500
 asked a question  derivative(5x, x) returns syntax error Since I did not remember the command to do a derivative, I was trying with a very simple formula. Since I did not find the right command on my own, I looked at SageMath guide and then I tried to run the following command derivative(5x, x)
but it returns error Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_22.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# * coding: utf8 *\\n" + _support_.preparse_worksheet_cell(base64.b64decode("ZGVyaXZhdGl2ZSg1eCwgeCk="),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpZWBMYQ/___code___.py", line 2
derivative(5x, x)
^
SyntaxError: invalid syntax
Instead the command from the guide derivative(x^2, x)
works flawlessly. They seem both equal, but mine does not work. Why? 
20150921 04:25:44 0500
 asked a question  plot((e^x)5) returns syntax error Could you please tell me why command plot((e^x)5)
returns error Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_13.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# * coding: utf8 *\\n" + _support_.preparse_worksheet_cell(base64.b64decode("cGxvdCgoZV4teCk1KQ=="),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmphGwtBs/___code___.py", line 3
plot((e**x)_sage_const_5 )
^
SyntaxError: invalid syntax
and why command plot((e^x))
works flawlessly instead? 
20150326 22:11:40 0500
 marked best answer  Fedora cert tools I am working on setting up a public Sage server.
I downloaded the 64 bit Sage package for Fedora, then to enable secure mode, I did: ./sage i openssl ./sage f python SAGE_UPGRADING=yes make ssl but when trying to start the public notebook....
[sage@PD2 sage5.6linux64bitfedora_release_16_verne_x86_64Linux]$ ./sage

 Sage Version 5.6, Release Date: 20130121 
 Type "notebook()" for the browserbased notebook interface. 
 Type "help()" for help. 

sage: notebook(automatic_login=False,interface='',secure=True)
The notebook files are stored in: sage_notebook.sagenb
In order to use an SECURE encrypted notebook, you must first run notebook.setup().
Now running notebook.setup()

RuntimeError Traceback (most recent call last)
/home/sage/.sage/<ipython console=""> in <module>()
/home/sage/sage5.6linux64bitfedora_release_16_verne_x86_64Linux/devel/sagenb/sagenb/notebook/notebook_object.pyc in __call__(self, *args, **kwds)
221 """
222 def __call__(self, *args, **kwds):
> 223 return self.notebook(*args, **kwds)
224
225 notebook = run_notebook.notebook_run
/home/sage/sage5.6linux64bitfedora_release_16_verne_x86_64Linux/devel/sagenb/sagenb/notebook/run_notebook.pyc in notebook_run(self, directory, port, interface, port_tries, secure, reset, accounts, openid, server_pool, ulimit, timeout, upload, automatic_login, start_path, fork, quiet, server, profile, subnets, require_login, open_viewer, address)
600 print "In order to use an SECURE encrypted notebook, you must first run notebook.setup()."
601 print "Now running notebook.setup()"
> 602 notebook_setup()
603 if (not os.path.exists(private_pem) or
604 not os.path.exists(public_pem)):
/home/sage/sage5.6linux64bitfedora_release_16_verne_x86_64Linux/devel/sagenb/sagenb/notebook/run_notebook.pyc in notebook_setup(self)
368
369 if not cmd_exists('certtool'):
> 370 raise RuntimeError("You must install certtool to use the secure notebook server.")
371
372 dn = raw_input("Domain name [localhost]: ").strip()
RuntimeError: You must install certtool to use the secure notebook server.

20150326 22:09:12 0500
 marked best answer  TypeError: 'sage.rings.integer.Integer' object is not callable I tried to enter into notebook: a=2 (((a1)^2)((a8)(2(a1))))/((a1)^4) And I obtained error Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_13.py", line 10, in
<module>
exec compile(u'open("___code___.py","w").write("#
 coding: utf8 \n" + _support_.preparse_worksheet_cell(base64.b64decode("KC0oKGEtMSleMiktKCgtYS04KSgyKGEtMSkpKSkvKChhLTEpXjQp"),globals())+"\n");
execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpF91cWI/___code___.py", line
3, in <module>
exec compile(u'(((a_sage_const_1 )_sage_const_2 )((a_sage_const_8
)(_sage_const_2 (a_sage_const_1
))))/((a_sage_const_1
)_sage_const_4 ) File "", line 1,
in <module>
TypeError: 'sage.rings.integer.Integer' object is
not callable 
20150326 22:08:53 0500
 marked best answer  Setting up a public Sage server Hi. I have a desktop computer with an Athlon II X3 440 (probably he will be updated soon with an AMD FX 8350), 32Gb of RAM and Fedora 17 64bit.
I would like to set up a public Sage server on a unprivileged Fedora user.
I am not a security expert, but I need to avoid abuses, so I need suggestions how to secure a public Sage server, where people can sign in from Sage server's webpage and start immediately The wiki page
http://wiki.sagemath.org/SageServer
does not seem to be enough for my needs 
20150326 22:08:49 0500
 marked best answer  Fedora, pyOpenSSL I am setting up a public Sage server on a Fedora 18 machine (Python version python2.7.313.fc18.x86_64)
To have the possibility to enable the secure mode, I installed pyOpenSSL package from Fedora repositories (pyOpenSSL0.134.fc18.x86_64) , but when I try to start the Sage server, I obtain these error messages: sage: notebook(port=8082,
interface='', secure=True,
accounts=True, ulimit='v 500000 t
120', automatic_login=False)
 RuntimeError Traceback (most recent
call last) /home/user/sage/sage5.5linux64bitfedora_release_16_verne_x86_64Linux/<ipython console=""> in <module>() /home/user/sage/sage5.5linux64bitfedora_release_16_verne_x86_64Linux/devel/sagenb/sagenb/notebook/notebook_object.pyc
in _call_(self, args, *kwds) 221 """
222 def _call_(self, args, *kwds):
> 223 return self.notebook(args, *kwds) 224 225 notebook = run_notebook.notebook_run /home/dna/sage/sage5.5linux64bitfedora_release_16_verne_x86_64Linux/devel/sagenb/sagenb/notebook/run_notebook.pyc
in notebook_run(self, directory, port,
interface, port_tries, secure, reset,
accounts, openid, server_pool, ulimit,
timeout, upload, automatic_login,
start_path, fork, quiet, server,
profile, subnets, require_login,
open_viewer, address) 476 import
OpenSSL 477 except ImportError:
> 478 raise RuntimeError("HTTPS cannot be used without pyOpenSSL" 479
" installed. See the Sage README for
more information.") 480 RuntimeError: HTTPS cannot be used
without pyOpenSSL installed. See the
Sage README for more information. 
20150105 18:52:38 0500
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20140717 02:47:51 0500
 commented answer  Condition of type: SIMPLECONDITION how can I send it to you privately? I cannot find a private message button on ask.sagemath.org 
20140716 14:37:13 0500
 commented answer  Condition of type: SIMPLECONDITION "my Sagemath's server web interface", I mean I am running sage, then notebook() on a remote server your and I connect to with a browser. 
20140716 09:18:33 0500
 asked a question  Condition of type: SIMPLECONDITION Executing limit(((x^(2*x)2*factorial(x)+x*log(x,10))^((x^(2*x))/factorial(x)))/(x^(((2*x)^(2*x))/(factorial(x1)))),x=infinity)
on my Sagemath's server web interface, I obtain: Condition of type: SIMPLECONDITION
Undefined limit product $INFINITY * $ZEROA in limtimes
Available restarts:
1. (CONTINUE) Return from BREAK.
Top level in: #<process TOPLEVEL>.
>
What can I do? 'Sage Version 6.1.1, Release Date: 20140204' 
20140716 09:15:31 0500
 commented answer  Syntax error on limit Hi, thank you for the exhaustive answer. Concerning `2n!` I don't know, I simply saw it as is, in the pdf of the professor.
Concerning SageMath version, I edited my post.
The command was executed on my Sagemath's server web interface. 
20140716 09:06:33 0500
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20140716 09:06:33 0500
 edited question  Syntax error on limit I would like to execute limit(((n^(2n)2n!+n*log(n,10))^((n^(2n))/(n!)))/(n^(((2n)^(2n))/((n1)!))),n=infinity)
but I obtain the wellknown big huge error message with painful infos inside. I cannot manage to fix the error, since I do not understand what is. Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_19.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# * coding: utf8 *\\n" + _support_.preparse_worksheet_cell(base64.b64decode("bGltaXQoKChuXigybiktMm4hK24qbG9nKG4sMTApKV4oKG5eKDJuKSkvKG4hKSkpLyhuXigoKDJuKV4oMm4pKS8oKG4tMSkhKSkpLG49aW5maW5pdHkp"),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/tmp/tmpe9jdup/___code___.py", line 3
limit(((n**(2n)2n!+n*log(n,_sage_const_10 ))**((n**(2n))/(n!)))/(n**(((2n)**(2n))/((n_sage_const_1 )!))),n=infinity)
^
SyntaxError: invalid syntax
'Sage Version 6.1.1, Release Date: 20140204' 