Why factor(6*x+3) doesn't give 3*(2*x+1) ?
Thanks!
cs
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No
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in the symbolic ring 3*(2*x+1) is immediately expanded again. Try
> yourself:
>
> sage: 2*(1+3*x)
> 6*x + 2
>
> But see also https://trac.sagemath.org/ticket/21067
>
> Regards,
>
> On Thursday, April 6, 2017 at 5:47:28 PM UTC+2, Chris Seberino wrote:
>>
>> Why fac
I have no doubt you know about group theory and math in general more than
me. I have no doubt
your answer is defensible and accurate.
What I'm concerned about is the young students and what they expect to see
when
they type factor( ... ).
cs
On Friday, April 7, 2017 at 9:56:31 AM UTC-5, pro
Saturday, April 8, 2017 at 3:21:17 PM UTC-5, saad khalid wrote:
>
> I am a student and I definitely agree with Chris Seberino here. I don't
> think it is the job of software (or, rather, it is not good CAS design) to
> try and teach people mathematics in this way. I think that the CA
I've tried lots of variations of the following to replace a product of
functions with y. They all give the error at the bottom in Sagecell. How
fix?
var("y")
f = function("f")(x)
g = function("g")(x)
eqtn = f(x) * g(x) + 4*f(x)^2 * g(x) == 0
eqtn = eqtn.substitute({f(x) * g(x) : y})
show(eqtn)
This does not solve...
var("y C")
solve( log(y) == C + log(x) + log(y-1),y)
It returns
[log(y) == C + log(x) + log(y - 1)]
Any ideas?
Thanks!
Chris
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Emmanuel
Thank you for your reply but you solved a DIFFERENT equation. Notice mine
has an x variable in it.
I can get your's to work but not mine.
cs
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which checks.
>
> Again, sorry for the noise...
>
> --
> Emmanuel Charpentier
>
>
> Le dimanche 16 juillet 2017 18:29:46 UTC+2, Chris Seberino a écrit :
>>
>> Emmanuel
>>
>> Thank you for your reply but you solved a DIFFERENT equation. Notice
>>
In SageCell this shows each element with a nice light blue background and a
TINY amount of space between them
show(table(["A", "B", "C"]))
How remove that space so that all the light blue backgrounds go together
and appear all as one piece?
Chris
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This outputs some text.
show(table(["test"]))
How change the background color?
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How combine text (with and without Latex) and equations when printing?
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How make show("some text") be LEFT ALIGNED instead of CENTERED?
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To pos
Shouldn't the 2 lines below work in SageCell? It gives an error because
the implicit multiplication isn't set. Why?
implicit_multiplication(10)
4 5
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I'm trying to get Sage to do simplification of algebra equations. After I
expand some polynomial products I see identical terms on both
sides of the equation.
How make Sage eliminate those? the simplify and full_simplify don't seem
to do it.
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> you will be able to use the very powerful tools specifically for
> polynomials, rather than the symbolic ring.
>
>
> On Tuesday, November 29, 2016 at 5:55:48 PM UTC, Chris Seberino wrote:
>>
>> I'm trying to get Sage to do simplification of algebra equations.
On Mar 27, 6:04 am, kcrisman wrote:
> Maybe one
> (you? :) ) can implement a catch...
At first I was interested in this change but now I'm wondering if it
is best the way it is now.
f(x) = defines a symbolic object as was previously mentioned. A
symbolic object is for analytical results
On Mar 27, 6:20 pm, Jason Grout wrote:
> We already have plenty of approximation functions attached to the
> symbolic functions.
> sage: sin(1).numerical_approx()
Yes. I was unclear. What I meant was it wouldn't make sense to use
approximation function in the *definition* of a symbolic func
On Mar 27, 5:58 am, kcrisman wrote:
> And I wasn't implying one should always define callable functions, I
> just meant it is an argument for doing so as often as possible when it
> is reasonable. I do not personally always like callable functions,
> but this is an argument for doing it fairly
In a new sage session...
(Notice the A(t) function returns values just fine. Why doesn't plot
() like it?)
sage: W(t)=95*sqrt(t)*sin(t/6)^2
sage: R(t)=275*sin(t/3)^2
sage: def A(t):
: return 1200 + numerical_integral(W(x)-R(x),0,t)[0]
:
sage: A(0)
1200.0
sage: A(18)
1309
On Mar 31, 11:06 am, Jason Grout wrote:
> Oh, right. Duh. I should have seen that.
Since you nor I did see that, should we ask if there is a way to unify
the syntax for symbolic expressions and python functions to make
plotting more "idiot proof" so to speak? Or maybe there is a good
reason
def g(x):
return numerical_integral(sin(t),0,x)[0]
For the function g, this works:
sage: plot(g,x,2,4)
but not this
sage:plot(g(x), x, 2, 4)
If I'm not mistaken, the first form of plot above works with ALL
functions right? So is there any reason to ever bother with second
form just beca
Which Sage tarball/package should I use for Ubuntu 9.04 (Jaunty
beta) ??
The Ubuntu 8.10 tarball doesn't work there. I get
"9587 Illegal instruction"
cs
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Notice first and second are very similar except for the cos() and exp
().
Why first one ok but second bombs?
sage: numerical_integral(sin(pi*cos(x/2)),0,2)[0]
0.85397903781471396
sage: numerical_integral(sin(pi*exp(x/2)),0,2)[0]
-
On Apr 24, 7:09 pm, mabshoff wrote:
> So I cannot reproduce this. What platform are you on and are you using
> a binary, build from source, etc?
I'm on an Ubuntu 9.04 ThinkPad T41 laptop. I built my Sage install
from 3.4 source myself as there was no binary yet for this latest
Ubuntu.
cs
--~
On Apr 25, 2:10 am, mabshoff wrote:
> I ran this on 3.4, 3.4.1 and a couple other rc releases in between:
>
> sage: for i in (0..200):
> : numerical_integral(sin(pi*exp(x/2)),0,2)[0]
> :
>
> and I could not get a failure.
Hmm. That is weird. I just compiled 3.4.1 from source and g
On Apr 25, 5:36 pm, mabshoff wrote:
> Not really, we switched from clisp 2.46 to 2.47 and if you look at
>
> https://groups.google.com/group/sage-devel/t/753a8d2f3c052183
>
> for some people who have had issues for a long, long time we could
> never get to the bottom of all the sudden they c
On Apr 25, 7:02 pm, mabshoff wrote:
> > What should I do until Sage 4.0? Is there a way to tweak my 3.4.1 to
> > use clisp 2.47?
>
> Do you mean clisp 2.46 since 3.4.1 ships with clisp 2.47 while Sage
> 3.4 used clisp 2.46?
Since *I* was able to reproduce the problem on 3.4 on Ubuntu Jaunty
On Apr 26, 1:36 am, mabshoff wrote:
> I do not see how that rules out clisp 2.47 - or am I just not getting
> what you are driving at :)
I meant if I can recreate the problem from 3.4 source as well as 3.4.1
source then doesn't that mean I can recreate the problem in both
version of clisp? He
On Apr 27, 2:33 am, Jason Grout wrote:
> I just upgraded to Jaunty over the weekend, and then compiled 3.4.1 from
> scratch. Both expressions work for me:
Hmm. Does Sage leave a log build regarding the compilation? Perhaps
my build had some errors yours doesn't have I should look for?
cs
-
Sage does calculus and geometry calculations so I don't understand why
the term "Computer Algebra System" is so prevalent.
What is the definition of "algebra"? Perhaps "algebra" means something
like "the manipulation of a finite number of objects" ?
Chris
--~--~-~--~~~--
On May 17, 11:29 am, john_perry_usm wrote:
> I was under the very vague impression that computer algebra systems a
> la Maple, Mathematica etc. were so-called because they started out
> emphasizing algebraic and symbolic manipulation, and so came out of
> the so-called "computer algebra" communit
I installed sage-4.1.1-linux-Ubuntu_9.04-i686-Linux.tar.gz twice on
my Ubuntu 9.04 laptop.
Both times I get the following...
/usr/local/sage-4.1.1-linux-Ubuntu_9.04-i686-Linux/local/bin/sage-
sage: line 199: 30899 Illegal instruction sage-ipython "$@" -i
cs
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The wonderful Sage notebook uses relative urls like
/login and /register. How make Sage notebook use relative urls with
common base like
/foo/login and /foo/register instead?
(This is needed for the Apache proxying I'm trying to do.)
Chris
--~--~-~--~~~---~--~~
I'm writing an /etc/init.d script to start and stop the Sage notebook.
I'm not sure how to cleanly shutdown the notebook from the command
line.
ps -ef shows a lot of sage processes so it isn't obvious which one I
should kill -9.
I tried killing some but can't find the right one that shuts down
I have an Ubuntu 9.04 Xen virtual machine with 350 Mb RAM.
(from linode.com hosting services)
I tried to have 7 people run notebooks off this server simultaneously
and it was painfully slow for each.
I started the server with this command...
sage -notebook accounts=True ulimit="-v 10" &
(A
How group terms in an expression?
e.g. How group terms with x and y in:
3*x + m*x + a*y+b*y
to get:
(3 + m)*x + (a + b)*y ??
cs
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I saw an old Sage LiveCD on sagemath.org. I don't understand how this
is possible since Sage unpacked is 1.5 Gb. A CD can hold around 650Mb
and it must also include the Linux operating system.
If there is a way please tell me as this would be useful for my less
tech savvy Windows users.
Sincer
How make worksheet run some code at startup?
e.g. var("a b c d ... z") ?
Currently my students need to evaluate var("a b c ... z") in every
worksheet I give them. It would be nice to hardcode this into
worksheets somehow.
Thanks!
Chris
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To
What is the default font in Sage notebooks? Possible to hardcode a new
default?
If I don't use the default, I've noticed I must respecify the desired
font in every new text area because Sage keeps defaulting back to the
default font.
cs
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To po
On Oct 15, 2:21 pm, William Stein wrote:
> Are you asking about TinyMCE, i.e., when you "shift-click" and edit
> plain text between cells?
yes
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For educational purposes it would be nice if possible to see all
operations in an expression explicitly. Can Sage do something ilke
convert
3+4*5
to something like:
Add(3, Product(4,5) )
in the notebook when you press Evaluate?
cs
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Possible to do superscripts, subscripts and Greek letters in
notebooks?
cs
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Is there an easy way to add Latex math equations to html like Sage
notebooks?
cs
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For mo
4.1.2 giving "Illegal instruction" on Ubuntu 9.04.
I'm using a Lenovo R52 laptop.
4.1.1 worked.
cs
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I understand there is a well know bug in how Sage interacts with
TinyMCE that causes text to be shuffled around or deleted.
Is there a workaround or way to avoid this?
(The latest version of Sage won't install on Ubuntu 9.04 for me w/o
getting "Illegal Instruction" errors so that isn't an option
On Oct 27, 1:44 pm, William Stein wrote:
> (3) install the posted binary, then type the following in SAGE_ROOT
>
> rm spkg/installed/mpir* spkg/installed/atlas*; make
Beautiful! It worked. You seemed to have known that this was the
cause of "Illegal Instruction" errors.
Would it be a good
Sage notebooks are great but take a lot of RAM (I assume) partially because
they need to remember all the history
of the current session.
Is it possible to trade history for responsiveness/memory by somehow
running the notebook server
to accept single commands and then forget the results?
I'm e
Oh wow that is soo awesome. Someone read my mind.
I've been selling Sage to my students with a slightly inadequate server but
Sage Cell Server will dispense with the need for passwords,
memory issues and more.
Their impressions of Sage are about to go up tenfold.
A thousand thank yous.
Chris
bug found in solve function? solve( x * (x + 2) == 143, x) returns [x ==
11, x == -13]
See here...new Sage session...
% sage
--
| Sage Version 5.2, Release Date: 2012-07-25 |
| Type "notebook()" for the
On Friday, July 12, 2013 5:01:11 PM UTC-5, William wrote:
>
> On Fri, Jul 12, 2013 at 2:41 PM, Chris Seberino
> >
> wrote:
> > bug found in solve function? solve( x * (x + 2) == 143, x) returns [x
> ==
> > 11, x == -13]
> >
> > See here...new S
I've been searching the Internet and can't find examples of plots of
functions of THREE
variables like f(x, y, z).
I'd like to use a different color at each point in space to denote the
function value.
Is that possible in Sage? Are there examples somewhere?
(All the examples I saw were for 2
command in subject line should return 1/5 not empty set right??? What gives?
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If you ask Sage to do something it can't, like solve a quintic polynomial
equation, it will spit the question back at you.
If Sage did that I'd be fine. However, Sage spit back the empty set which
is the WRONG answer and far different yes?
On Sunday, November 16, 2014 12:54:20 PM UTC-6, RRoge
I didn't *need* to have 0.04. This is just a command that actually came up
in real work.
I didn't want to alter it in any way lest it may be a genuine bug.
cs
On Monday, November 17, 2014 6:48:04 AM UTC-6, Emmanuel Charpentier wrote:
>
> Why 0.04 ? Th notebook says :
>
> S=(5^( x -1) == (0.04)^
Emmanuel
Any way to make Sage act like it can't find the solution (emit question
back to user) INSTEAD of emitting the empty set?
"I can't find the solution" and "There is no solution" are NOT the same
thing?
> cs
>>
>
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On Wednesday, November 19, 2014 8:48:07 AM UTC-6, Jakob Kroeker wrote:
>
>
> Even if it is expectable that in some cases (which?) solve may not return
> all solutions, it should be explicitly pointed out;
> Especially it should be stated that an empty list does not necessarily
> imply there are
I tried to save a Sage notebook I made on one of the public Sage
servers and noticed some content at the end was chopped off and some
cells in the middle were gone.
I think I saw this a few months ago. Is there a fix for this?
Perhaps the public Sage servers have old versions? Or maybe this is a
What's easiest way to get Sage running on Windows for non-techie
students?
They'll be lost if the instructions are complicated.
Possible to wrap a VMWare + Ubuntu + Sage blob into one big Windows
exe file that requires no set up?
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On Oct 9, 7:24 pm, Jason Grout wrote:
> [1]http://sagemath.org/download-windows.html
That link has a WinZip'd VMWare blob that works fine. I didn't even
read the directions...I just double clicked on binaries in the
extracted directory until a VMWare Linux virtual session appeared with
a Sage ic
> On Oct 9, 7:24 pm, Jason Grout wrote:
Oh wait. I see your point now. *I* didn't have to install VMWare
because I probably installed it a long time ago. I assumed that meant
you didn't need to install VMWare anymore. Yeaa video would be
nice for that extra step too.
cs
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I have a dedicated Xen Ubuntu virtual machine with 0.5 Gb RAM and
Intel Xeon 2.27GHz CPU. The bandwidth is pretty good. (linode.com is
my hosting provider.)
Why even with just 3 people we sometimes get the green bar while Sage
processes the calculuation? I often tell students that means they
n
a for calculus.
Anyone know of such a project or if NSF or anyone else would be
interested in funding development of such Sage interactive textbooks?
Sincerely,
Dr. Chris Seberino
ch...@phil4.com
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I wanted to confirm that a certain infinite sum agrees with a certain
number to thousands of digits of accuracy. I know this is true from a
fascinating formula at the top of page 2 of the paper referenced
here:
http://arxiv.org/abs/math.GM/0409014/
The following one liner outputs the error in the
On Dec 13, 2:47 am, Simon King wrote:
> sage: 2*sum(10^(-k^2/d) for k in range(1,2))
> 2.02019722722490674759723772962542922944721452394745083...e-1
> So there is a small progress in the summation! But I have no idea
> whether at the end of the day the small progress will be eno
In a previous post I was told to use RealField if I wanted very high
degrees of accuracy.
I'm still now sure I'm using RealField right and would appreciate any
help debugging my puzzle.
sage: constant = 100*sqrt(pi/log(10.0))
sage: f(k) = 10^(-k^2/1.0)
sage: N = 1
sage: RealField(10)(
On Dec 13, 1:09 pm, kcrisman wrote:
> I think you would have to let k be in that RealField, wouldn't you?
> Or at least f(k). That might be part of the issue. If you put the
> whole sum in RealField, the precision will be that of 1.0, I
> suppose (?) ...
How do you put k in the RealField?
OK thanks for your help. I think I got it. The effect of RealField
is like creating a new number type. I need to make sure all my real
are of the right type. It appears integers are fine as is.
Here is working code...
def test(big):
my_pi = RealField(big)(pi)
ten= RealF
How have forms in Sage notebooks where users can enter values? I'm
thinking of making user friendly Sage notebooks with lots of
interactive components. I can imagine users needing to enter values
in addition to moving sliders with the mouse.
(Yes they can just use cells but adding a form field i
On Dec 14, 3:42 pm, Jason Grout wrote:
> To get a better idea of what you are asking, what would you want to do
> with those values? Run a calculation and give output? Or store those
> values later to be graded somehow by an instructor? Something else?
Do you know of where I can find lots of
My students authenticate themselves by signing into a classroom web
app unrelated to Sage.
Possible to integrate Sage notebook server with this classroom web app
so students
DO NOT have to authenticate a SECOND TIME with Sage login page?
Chris
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:
> On 5/26/11 12:35 AM, Chris Seberino wrote:
>
> > My students authenticate themselves by signing into a classroom web
> > app unrelated to Sage.
>
> > Possible to integrate Sage notebook server with this classroom web app
> > so students
> > DO NOT have to aut
Suppose different students sign into the same Sage server at different
times.
Won't that cause EVERY STUDENT's notebook to be in memory bogging down
the server?
I've been rebooting but maybe the smartest thing is to either...
1. Make students sign out? (Some will forget!!)
2. Autokill after 1 h
How set up new accounts in a Python script? (instead of the notebook
web form?)
I would like to automate this process if possible.
Thanks!
cs
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On May 27, 3:34 pm, Berkin Malkoc wrote:
> It is in the
> reference:http://www.sagemath.org/doc/reference/sagenb/notebook/notebook.html
Thank you. Those docs appear to be for a Sage session.
I actually need it to work from a Django web application unrelated to
Sage!?!?
In other words, my ques
Apache proxy in front of Sage notebook server works perfect until I
turn on SSL.
Different Apache configs give different Sage errors.
Is there something special required to do Sage with Apache SSL proxy?
cs
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Notebook documentation mentions a boolean switch called "secure" for
SSL.
When I try to turn it on my notebook server, I get an error about a
domain Sage needs.
How exactly does this switch work and how does Sage want to do SSL?
In my limited experience, when I want SSL protection, I set up an
A
Is it correct that if one uses SSL for a notebook server than ALL the
pages MUST be under SSL?
The reason I'm asking is that the notebook server appears unable to
handle Apache configs that try to switch from SSL to unencrypted after
login.
In other words, notebook is brittle when it comes to att
I wrote the script below to automatically add accounts to my notebook
server.
I ran it as follows $SAGE_DIR/sage-python XXX YYY ZZZ
for some values of XXX, YYY and ZZZ. When I tried to login with value
in XXX for username and in YYY for password Sage notebook server did
not recognize that account
Sage notebooks docs here:
http://www.sagemath.org/doc/reference/sagenb/notebook/notebook.html
suggest creating a notebook object to manage notebook server in a
script like so...
nb = sagenb.notebook.notebook.Notebook(tmp_dir()+'.sagenb')
Is this notebook handle necessary tied to my existing not
cked and when I log into PayPal, it stays in SSL mode.
However, when I log into eBay, it jumps OUT of SSL mode. Godaddy
seems to do some pages with SSL and some without SSL.
Whenever these sites drop down to unencrypted, aren't they also
insecure since eBay and Godaddy are sending cookies in t
How configure notebook server to have ALL new worksheets for ALL users
run some customizations?
e.g. I want implicit_multiplication(True) to be global as well as
var("a b c d e f g h z")
and var("alpha beta gamma delta omega")
cs
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Nevermind. I found out about $HOME/.sage/init.sage
cs
On Jun 13, 11:54 pm, Chris Seberino wrote:
> How configure notebook server to have ALL new worksheets for ALL users
> run some customizations?
>
> e.g. I want implicit_multiplication(True) to be global as well as
> var(&
I created a little worksheet called
http://phil4.com/public/sage/Scientific_Notation.sws
to illustrate the problem.
The single cell with code has this...
%hide
%auto
@interact
def _(exponent=(-6..6)):
html('The Number: $%f$'%(5 * 10**exponent))
html('In Scientific Notation: $5 \cdot 10^{%d}$
When I try to type a URL for a worksheet to upload, I can't type.
Instead, the browse popup appears and I'm forced to browse for a local
file!!!
Was the typing in the text field disabled somehow?
cs
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t just the other
> day.
>
> What server are you using? Or, if local, what version? This could
> conceivably be related to the recent updating of the sagenb.org family
> of servers.
>
> On Jun 20, 11:15 am, Chris Seberino wrote:
>
> > When I try to type a URL for
How delete published worksheet if you already deleted the copy in your
account folder?
Normally I could just "unpublish" a worksheetbut since I deleted
the original version, I can't do that!?!?
Sincerely,
Chris
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I display some Latex commands in HTML on the small worksheet below...
http://phil4.com/public/Trig.sws
Notice all the trig functions are fine except for tan.
Is there a problem with Latex commands that begin with \t for some
reason?
Sincerely,
Chris
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On Jun 20, 10:41 am, kcrisman wrote:
> Type "%auto" on a line by itself at the beginning of a cell to
> automatically evaluate the cell when the worksheet is first opened.
kcrisman
That works one one! Thanks! I made a little worksheet that %auto
still doesn't seem to work on...
http://phil4
http://phil4.com/public/Trig2.sws works perfectly in Firefox but has
issues in Chrome and
Internet Explorer.
The slider of interact widget didn't work for one student in Internet
Explorer.
The html text was messed up for students using Chrome. It seems
multiple lines were on top of each other.
On Jun 21, 9:09 am, Rolf wrote:
> This question may sound somehow out of place, but maybe you can offer
> some help.
> Where in the documentation did you find something about this fancy
> notation to include variables into your html()?
I found it on one of the published worksheets not in officia
On Jun 21, 7:58 am, kcrisman wrote:
> Let us know if this helps. I agree it is suboptimal.
Since there may be other inconsistencies between browsers, it seems
safer to just have all students use Firefox. That is fine with me. I
had other unrelated browser incompatibility issues with some onl
On Jun 21, 7:56 am, kcrisman wrote:
> For clarification, this creates a "raw" string. You should also be
> able to use \\tan, which "escapes" the \ so that it doesn't have a
> special meaning to Python.
I imagine similar issues are going to happen for Latex commands that
begin with n and r the
On Jun 22, 4:26 am, Rolf wrote:
> Works with me, and you will see my enhancement to the code. The two
> variable thing.
Rolf
Thanks. Does your version automatically start up when you upload the
worksheet?
Your version works like mine but doesn't start automatically for me
like mine still.
cs
I love implicit_multiplication(True) but I noticed it doesn't work
between parens!?
How make this work?...
sage: (1 + 2) (3 + 4)
---
TypeError Traceback (most recent call
last)
/home/seb/ in (
ried to mangle something but I
failed. Still not sure what I should watch out for...
sage: n( sin( ( sin( .5 ) ) ) )
0.461269555033181
sage: n( sin( ( sin( .5 ) cos( sin(.1) ) ) ) )
0.459150207292798
cs
On Jun 24, 7:57 am, Jason Grout wrote:
> On 6/24/11 2:17 AM, Chris Seberino wrote:
>
On Jun 24, 11:59 pm, Jason Grout wrote:
> sage: implicit_mul('diff(f,x)(3)', level=10)
> 'diff(f,x)*(3)'
>
> which is definitely not what I intended.
Jason
Would you agree a good robust solution to your issue would be for an
implicit_mul level that *ONLY* converted spaces to multiplication? I
> Yes, as I said it starts automatically but it must have no descriptive
> comment above the cell. That is a worksheet with only one naked cell
> and no description in it.
> That's why I suggested to start a new worksheet from scratch.
R
OK I verified your solution. I have no clue how you figur
Instead of downloading a published worksheet, is it possible to copy
it to a user's account if it is on the SAME SERVER?
If all students must download published worksheets, I fear the less
tech-savvy will make mistakes that I'll need to address.
Chris
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awesome! thanks!
cs
On Jul 30, 2:08 am, Jason Grout wrote:
> On 7/29/11 11:40 PM, Chris Seberino wrote:
>
> > Instead of downloading a published worksheet, is it possible to copy
> > it to a user's account if it is on the SAME SERVER?
>
> > If all students must
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