RE: [sage-support] Re: keyboard shortcuts

[Anthony Wickstead]

I have just talked to our IT support person who set this up. What he has 
produced would not work for anyone else without knowledge of our passwords 
(which he obviously isn’t willing to share) and he doesn’t have time to produce 
a specific version for distribution. But he does tell me that (apart from 
tweaks that are only relevant in our teaching laboratory set up) the only 
changes that he made to the standard ova image was to disable the linux browser 
being started automatically and to change the keyboard layout. Then you can 
connect  a windows browser using http://localhost:8000 as the address. Both of 
those changes just involved, as far as he can remember, editing .xinitrc. 
Apparently you can open up a terminal to do that using Ctrl-Alt-F2. He got all 
the information that he needed from http://wiki.sagemath.org/SageAppliance.


From: sage-support@googlegroups.com [mailto:sage-support@googlegroups.com] On 
Behalf Of Christophe Bal
Sent: 30 October 2015 08:49
To: sage-support@googlegroups.com
Subject: RE: [sage-support] Re: keyboard shortcuts


Hello.

Can you share with us your image ?
Le 30 oct. 2015 09:42, "Anthony Wickstead" 
mailto:a.wickst...@qub.ac.uk>> a écrit :
I think that part of the problem being highlighted here is that the OVA’s that 
are provided all open a virtual linux browser to access Sage. I use Sage for 
undergraduate teaching at Queen’s University Belfast which is predominantly 
Windows based so that we use Sage in a VirtualBox, but have adapted the image 
provided not to open a linux browser and instead use a Windows browser to 
access Sage. This has several advantages, such as we control the browser 
settings and can see different tabs that get opened by Sage and it makes saving 
files into the Windows environment much easier. It also makes it easier to use 
the setup in a secure environment (i.e. no other applications allowed) for 
examination purposes.

Tony Wickstead





From: sage-support@googlegroups.com<mailto:sage-support@googlegroups.com> 
[mailto:sage-support@googlegroups.com<mailto:sage-support@googlegroups.com>] On 
Behalf Of Kevin Knaus
Sent: 29 October 2015 16:10
To: sage-support
Subject: [sage-support] Re: keyboard shortcuts

It is now 6 years on from when this post was originally made (2009, currently 
2015) and it is proving impossible to find a clear reference to keyboard 
shortcuts in SAGE. The context I have for this is two fold. One. I note William 
Stein and others commenting on the low retention rate for SAGE users. Two, if 
one downloads and installs on Virtualbox the most recent version of SAGE 6.9. 
It is very problematic to find out how to do simple navigation tasks in the 
Notebook. No clear hints exist on the notebook active worksheet page or home 
page on how to find key board settings and what they do.  It is all too easy to 
get trapped in the downloads page for example. Being a novice user, I like many 
I am sure, have clicked on downloads, gone there and seen the list of 
downloaded files. But, for the life of me, nothing seems present to return me 
to the worksheet I was in or the home page of the notebook session. After hours 
of searching across multiple days, I finally found a way to get back to the 
SAGE notebook session from a shell escape to command shell but only if I was 
originally in the Notebook session worksheet to begin with. (Centos 6.7 in this 
case, though the same applies to Centos 6.6). A user somewhere mentions trying 
Right ctrl F2, or R cntrl F7 and finally I find that Rctrl F7 works. But only 
to get back to the Notebook session from the command line. It doesn't work to 
get back from the downloads folder. Nor does right clicking in the downloads 
folder and selecting "Back"... you just seem to be trapped there. It cannot 
possibly be the case that there is no way back except to restart the VM, can 
it? So my point is simply, navigation does not need to be so problematic. 
Finding out how to navigate, does not need to be a major effort. But, if it is, 
then User Retention goes down. There are of course other reasons. But, some of 
you involved in the presentation of the information in link below, need to be 
able to simplify the conceptual presentation of usable information. A simple 
table of what keys do what things in which VM environments, or Cloud 
environments...Still don't have a way out of the downloads folder. No wonder 
retention suffers.

On Saturday, July 18, 2009 at 3:25:07 PM UTC-5, Jason Grout wrote:
Chris Chiasson wrote:
> I just want to add that I (eventually) found the following keyboard
> shortcuts I was looking for in another thread on the developer's list
> and that they should probably be added under the notebook section of
> the page shown at:
>
> http://sagemath.org/doc/tutorial/interactive_shell.html?highlight=keyboard
>
> Here are the shortcuts I was looking for:
>
> Create new cell (actually it split

RE: [sage-support] Re: keyboard shortcuts

[Anthony Wickstead]

I think that part of the problem being highlighted here is that the OVA’s that 
are provided all open a virtual linux browser to access Sage. I use Sage for 
undergraduate teaching at Queen’s University Belfast which is predominantly 
Windows based so that we use Sage in a VirtualBox, but have adapted the image 
provided not to open a linux browser and instead use a Windows browser to 
access Sage. This has several advantages, such as we control the browser 
settings and can see different tabs that get opened by Sage and it makes saving 
files into the Windows environment much easier. It also makes it easier to use 
the setup in a secure environment (i.e. no other applications allowed) for 
examination purposes.

Tony Wickstead





From: sage-support@googlegroups.com [mailto:sage-support@googlegroups.com] On 
Behalf Of Kevin Knaus
Sent: 29 October 2015 16:10
To: sage-support
Subject: [sage-support] Re: keyboard shortcuts

It is now 6 years on from when this post was originally made (2009, currently 
2015) and it is proving impossible to find a clear reference to keyboard 
shortcuts in SAGE. The context I have for this is two fold. One. I note William 
Stein and others commenting on the low retention rate for SAGE users. Two, if 
one downloads and installs on Virtualbox the most recent version of SAGE 6.9. 
It is very problematic to find out how to do simple navigation tasks in the 
Notebook. No clear hints exist on the notebook active worksheet page or home 
page on how to find key board settings and what they do.  It is all too easy to 
get trapped in the downloads page for example. Being a novice user, I like many 
I am sure, have clicked on downloads, gone there and seen the list of 
downloaded files. But, for the life of me, nothing seems present to return me 
to the worksheet I was in or the home page of the notebook session. After hours 
of searching across multiple days, I finally found a way to get back to the 
SAGE notebook session from a shell escape to command shell but only if I was 
originally in the Notebook session worksheet to begin with. (Centos 6.7 in this 
case, though the same applies to Centos 6.6). A user somewhere mentions trying 
Right ctrl F2, or R cntrl F7 and finally I find that Rctrl F7 works. But only 
to get back to the Notebook session from the command line. It doesn't work to 
get back from the downloads folder. Nor does right clicking in the downloads 
folder and selecting "Back"... you just seem to be trapped there. It cannot 
possibly be the case that there is no way back except to restart the VM, can 
it? So my point is simply, navigation does not need to be so problematic. 
Finding out how to navigate, does not need to be a major effort. But, if it is, 
then User Retention goes down. There are of course other reasons. But, some of 
you involved in the presentation of the information in link below, need to be 
able to simplify the conceptual presentation of usable information. A simple 
table of what keys do what things in which VM environments, or Cloud 
environments...Still don't have a way out of the downloads folder. No wonder 
retention suffers.

On Saturday, July 18, 2009 at 3:25:07 PM UTC-5, Jason Grout wrote:
Chris Chiasson wrote:
> I just want to add that I (eventually) found the following keyboard
> shortcuts I was looking for in another thread on the developer's list
> and that they should probably be added under the notebook section of
> the page shown at:
>
> http://sagemath.org/doc/tutorial/interactive_shell.html?highlight=keyboard
>
> Here are the shortcuts I was looking for:
>
> Create new cell (actually it splits cells, but whatever): Ctrl + Enter
> Delete cell (actually it merges cells): Ctrl + Backspace
> Evaluate cell (already knew this one from Mathematica): Shift + Enter
>
> --

Thanks for pointing out a place in the docs that should be improved.
These shortcuts (and others) are also documented in the page that comes
up when you click "Help" in the upper right corner of the notebook.
Maybe the tutorial should just say to read that page, if it doesn't already?

Jason

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RE: [sage-support] Factorial Carry Value in Python

[Anthony Wickstead]

I know of nothing built in to Sage, but this is easy to write. The following 
seems to work, even if it isn't very elegant:

def factrep(nn):
n=nn
i=1
while factorial(i)<=n:
i+=1
i-=1
ans=[]
while i>0:
d=n//factorial(i)
ans.append(d)
n-=d*factorial(i)
i-=1
return ans

Tony Wickstead

From: sage-support@googlegroups.com [mailto:sage-support@googlegroups.com] On 
Behalf Of Juan Grados
Sent: 13 November 2013 21:45
To: sage-support
Subject: [sage-support] Factorial Carry Value in Python

Let be s between 1 and l!-1 an integer value then s can expressed uniquely than:

s = u1*(l-1)! + u2*(l-2)!+ ... ul*0

Is there any function to find the values u1, u2, ..., ul in SAGE or python?

--
-
MSc. Juan del Carmen Grados Vásquez
Laboratório Nacional de Computação Científica
Tel: +55 24 2233-6260
(http://www.lncc.br/)
http://juaninf.blogspot.com
-
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[sage-support] Re: Polynomial of roots as function of coefficient

[Anthony Wickstead]

Can't help with Sage, but Mathematica 8.0 has no function SymmetricReduce. 
It does have SymmetricReduction:

SymmetricReduction[f,{Subscript[x, 1],...,Subscript[x, n]}] 
gives a pair of polynomials {p,q} in Subscript[x, 1],...,Subscript[x, n] 
such that f==p+q, where p is the symmetric part and q is the remainder.

but I don't think that is relevant to you.

Tony Wickstead

On Sunday, August 19, 2012 7:34:50 AM UTC+1, jori.ma...@uta.fi wrote:
>
> Can Sage calculate for example sextic resolvent? I mean something similar 
> than "P(x)=x^3+ax^2+bx+c and roots of P are x1, x2 and x3. Express 
> (x1-x2)(x2-x3)(x1-x3) as a function of a, b and c." 
>
> Some webpages says that Mathematica could make this with SymmetricReduce, 
> but I can't test that just now. 
>
> -- 
> Jori Mï¿œntysalo 
>

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RE: [sage-support] Re: Excluding range from plot

[Anthony Wickstead]

But in your example the first range is empty. I changed the exclude value to 
[1..2,3..4] and again the first interval is fine and the second wrong.

Tony

Thanks for this bug report.  Sometimes this happens even for the first range.

sage: plot(sin(pi*x)^cos(pi*x),(x,0,4),exclude=[pi..2,3..4],ymax=20)

This is now http://trac.sagemath.org/sage_trac/ticket/12676.
Hopefully it's just something easy to fix with the exclude code.

- kcrisman

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[sage-support] Excluding range from plot

[Anthony Wickstead]

I am trying to understand the behaviour of the option exclude in plot() when a 
range of values is included.

It looks to me that if a simple range like "exclude=[pi..2*pi]" is used and the 
function is defined and real-valued in that range then the end points and 
integer points between are excluded from the plot, whilst if the function is 
not real-valued in the range, e.g. "sin(x)^cos(x)",  then the whole range is 
excluded.  However, if several ranges are specified then when the function is 
real-valued the behaviour is like that for a single range, whilst if the 
function is not real-valued then the graph *is* plotted, incorrectly, for 
ranges after the first. For example the graph of 
"plot(sin(x)^cos(x),(x,0,4*pi),exclude=[pi..2*pi,3*pi..4*pi])" contains a 
straight line between 3*pi and 4*pi. Surely this cannot be the intended 
behaviour?

I am using Sage 4.8, under Ubuntu 11.10 in a VirtualBox. 

Prof. A.W. Wickstead
Pure Mathematics Research Centre
Queen's University Belfast
University Road
Belfast BT7 1NN
Northern Ireland
Phone: 028 90976004
Fax: 028 90976060

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[sage-support] Two problems using SageTex on Sage 4.7.2

[Anthony Wickstead]

A few months ago I experimented with SageTex using Sage 4.7.1 on a
virtual machine running on my windows PC and got everything working
with little difficulty. I now have had a real Iinux server set up for
me running Sage 4.7.2. I have been very careful to replace my old
sagetex.sty and remote-sagetex.py with the latest ones, but now run
into (at least) two problems.

The first, that I can work around although it is redious, is that
sagetex when processing "test.tex" now produces "test.sagetex.sage"
rather than "test.sage". When processed using remote-sagetex.py this
puts plots into a directory "sage-plots-for-test.sagetex.tex".
Unfortunately when running LaTeX on test.tex again LaTeX looks in
"sage-plots-for-test.tex" for the plots. A rename can get around this
but it is a bit of a pain.

The second is probably a problem with our server set up, but my IT
support can't track it down. Any plots produced by Sage in PDF or PNG
formats are corrupted and unreadable by the appropriate viewer. LaTeX
claims that they have been corrupted by ASCII conversion. There is not
the same probem with EPS format, but that limits my possible
actions.My guess was that the corruption takes place in the transfer
from linux server to local (windows) PC. My IT support doesn't know
how this might have happened. Are there cached copies on the server of
the plots produced to compare with the versions donwloaded by remote-
sagetex.py? Or has anyone else come across this problem?

Any help at all would be appreciated.

Tony


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[sage-support] Re: Upgrade from source fails

[Anthony Wickstead]

On Dec 15, 9:45 pm, William Stein  wrote:
> On Thu, Dec 15, 2011 at 7:16 AM, Anthony Wickstead
>
>  wrote:
> > I am trying to upgrade my Sage 4.7.1 installation using "./sage -
> > upgrade" [and also using "upgrade()" from within sage]. After checking
> > mirrors, telling me that six packages will be upgraded  and warning me
> > that it could take hours, the upgrade aborts with the message "There
> > are uncommitted changes in the Sage root repository. Aborting." Is
> > this a problem on my installation (actually two independent
> > installations) or at the remote end of things?
>
> This is a bug in Sage, which has been discussed a few times on
> sage-devel.  I got around it by commenting out the relevant
> sys.exit(2) line in
>
>     SAGE_ROOT/local/bin/sage-update
>
>  -- William

That seems to have sorted it out. Upgrade now in process. Thank you.

Tony

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[sage-support] Upgrade from source fails

[Anthony Wickstead]

I am trying to upgrade my Sage 4.7.1 installation using "./sage -
upgrade" [and also using "upgrade()" from within sage]. After checking
mirrors, telling me that six packages will be upgraded  and warning me
that it could take hours, the upgrade aborts with the message "There
are uncommitted changes in the Sage root repository. Aborting." Is
this a problem on my installation (actually two independent
installations) or at the remote end of things?

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[sage-support] Re: Problem with VirtualBox image

[Anthony Wickstead]

I had exactly the same problem recently with a Dell Latitude D410
laptop that is about 6 years old. In that case it only complained
about pni. In the end I (reluctantly) created ny own VirtualBox
installation of Linux and compiled Sage from source. I have to say
that once you have Linux installed (I used Ubuntu, which is quite
friendly to install) the Sage install from source code instructions
are very good and once you have all the required tools installed the
actual make is just a one line instruction, even if I did have to
leave the make running overnight. I guess the problem is that the
virtual image was created on a newer machine and the image is
optimised to use the newer instruction set.

On Sep 23, 4:58 pm, luisfe  wrote:
> Hi list,
>
> I have downloaded the virtualbox sage image to run under windows to
> make a presentation of the capabilities of Sage. I wanted to try in
> windows and an old machine to try to force things. So I took my five-
> years good old laptop.
>
> The problem is that sage in virtualbox does not run. Sage complains
> that the processor does not have the instructions pni, ssse3
>
> While I assume that performance will be very very poor on this
> virtualized environment (I do neither have virtualization extensions
> in the processor). I had assumed that at least it would run.
>
> Is it a bug? What is the minimum hardware in wich Sage is expected to
> run? OK I know at least those flags in the processor. What I mean is
> if this restriction is intended.

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[sage-support] Re: pni and Sage 4.7

[Anthony Wickstead]

Thanks for the help. I was trying to avoid building Sage from source
as I am not all that Linux-literate, but I did try the current source
and it compiled and ran OK except for not creating .html files as

'makefile' v4.7 or later is needed to make HTML docs but missing on
your system

Apparently this is a known lack in Ubuntu which can easily be fixed
but maybe should be added to the list of assumptions for an
installation from source.

Tony

On Sep 2, 6:07 pm, William Stein  wrote:
> On Fri, Sep 2, 2011 at 10:00 AM, Maarten Derickx
>
>  wrote:
> > From the location of your sage install
> > ~/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-
> > i686-Linux
>
> > I see you downloaded a prebuild binairy, I guess what's going wrong is that
> > this binary was compiled in such a way that it's not compatible with your
> > system. This
> > post https://groups.google.com/forum/#!topic/sage-support/XJS-3u5z7ws
> > might be of help.
> > I don't know if we have old prebuild binary's publically available
> > somewhere,
>
> That won't help.
>
> > but at least we have old source code
> > on http://www.sagemath.org/src-old/
>
> And current source code:
>
>    http://www.sagemath.org/download-source.html
>
>  -- William
>
>
>
> > --
> > To post to this group, send email to sage-support@googlegroups.com
> > To unsubscribe from this group, send email to
> > sage-support+unsubscr...@googlegroups.com
> > For more options, visit this group at
> >http://groups.google.com/group/sage-support
> > URL:http://www.sagemath.org
>
> --
> William Stein
> Professor of Mathematics
> University of Washingtonhttp://wstein.org

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[sage-support] pni and Sage 4.7

[Anthony Wickstead]

I am trying to try out SAGE on my Dell Latitude D410 laptop, which has
a dual boot system running Vista and Ubuntu [Linux tony-laptop
2.6.32-33-generic #72-Ubuntu SMP Fri Jul 29 21:08:37 UTC 2011 i686 GNU/
Linux]. I downloaded SAGE 4.7 yesterday but the installation process
warned that it might not run because of a lack of pni. That seems to
be correct:

*
processor   : 0
vendor_id   :
GenuineIntel
cpu family  :
6
model   :
13
model name  : Intel(R) Pentium(R) M processor
2.00GHz
stepping:
8
cpu MHz : 2000.000
cache size  : 2048 KB
fdiv_bug: no
hlt_bug : no
f00f_bug: no
coma_bug: no
fpu : yes
fpu_exception   : yes
cpuid level : 2
wp  : yes
flags   : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts est tm2
bogomips: 3990.16
clflush size: 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:

*

The installation process suggested a work-around but warned that it
might not work. It didn't!

***

tony@tony-laptop:~/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-
i686-Linux$ sh sage
--
| Sage Version 4.7.1, Release Date: 2011-08-11   |
| Type notebook() for the GUI, and license() for information.|
--
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libcsage.so(print_backtrace+0x3b)[0x27b30e]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libcsage.so(sigdie+0x17)[0x27b34e]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libcsage.so(sage_signal_handler+0x1ad)[0x27ae70]
[0x1a1400]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/python2.6/site-packages/sage/rings/
integer.so(initinteger+0x29fb)[0xad750b]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(_PyImport_LoadDynamicModule+0xb6)
[0xea83a6]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(+0xe2f78)[0xea5f78]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(+0xe391f)[0xea691f]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(+0xe3c1c)[0xea6c1c]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(+0xe4296)[0xea7296]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(PyImport_ImportModuleLevel+0x3b)
[0xea77cb]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(+0xc7916)[0xe8a916]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(PyCFunction_Call+0x128)[0xe30c48]
/home/tony/Documents/sage-4.7.1-linux-32bit-ubuntu_10.04_lts-i686-
Linux/local/lib/libpython2.6.so.1.0(PyObject_Call+0x5c)[0xded73c]
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