[sage-support] Re: Warnings from JsMath
See http://www.math.union.edu/~dpvc/jsmath/download/jsMath-fonts.html.
There are install instructions for PC, Mac OS X, and Unix users.
On Jan 24, 11:45 pm, bill purvis [EMAIL PROTECTED] wrote:
On Friday 25 January 2008, William Stein wrote:
On Jan 24, 2008 8:52 PM, Timothy Clemans [EMAIL PROTECTED] wrote:
In the first versions of the Sage Notebook that message was actually
hidden.
(1) If one wants to disable the font message, comment out (with /* */) line
253 of SAGE_ROOT/devel/sage/sage/server/notebook/js.py and do sage -br:
/* jsMath = {Font: {Message: function () {}}} */
I do not think this should be the default in Sage. However, a nicer error
message would be good, which provides a link to a _local_ download page
for the jsmath fonts, which is much easier to understand and follow than
the official jsmath page.
(2) Any typesetting in the notebook basically looks like crap without the
jsmath fonts, so it would be bad to encourage people to completely remove
the warning message.
(3) The fonts are tiny (120KB) and fairly easy to install:
http://www.math.union.edu/~dpvc/jsmath/download/jsMath-fonts.html
-- William
The fonts I downloaded are 80Mb!
And where should they be installed? I can't work out where the
notebook server expects to find them.
I thought they were included as part of the Sage distribution, anyway?
Bill
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[sage-support] Re: Warnings from JsMath
On Jan 25, 2008 4:49 AM, bill purvis [EMAIL PROTECTED] wrote: On Friday 25 January 2008, Timothy Clemans wrote: See http://www.math.union.edu/~dpvc/jsmath/download/jsMath-fonts.html. There are install instructions for PC, Mac OS X, and Unix users. On Jan 24, 11:45 pm, bill purvis [EMAIL PROTECTED] wrote: Yes, but what about Sage users? They say unpack them in the server tree. I know where my Apache server keeps things, and I've installed them in there. ??! There is nothing about server trees here: http://www.math.union.edu/~dpvc/jsmath/download/jsMath-fonts.html You just download a 120KB zipped font file, extract it and install it as explained there. It has nothing whatever to do with servers. Where is the server tree for the notebook server? --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Putting parentheses around -1.
On 25/01/2008, Paul Zimmermann [EMAIL PROTECTED] wrote: In previous versions of Mathematica, there was a RealOnly package which defined odd roots as negative and printed Nonreal anytime a complex number was unavoidable. The idea was that you could simplify things for high school students or in situations in which you knew you were only interested real numbers. That package has apparently been deprecated now in version 6.0, being replaced by the functionality to Reduce an equation over the reals, etc. For details, you can see the package at http://library.wolfram.com/infocenter/MathSource/6771/ the problem with such a package, which basically simplifies (-1)^(1/3) to -1, is that it might have side effects with internal computations, and thus give wrong results. Imagine for example that for a given computation, which involves real numbers only at the user interface level, SAGE needs to compute internally over the complex numbers. If such an internal algorithm working on the complex numbers was designed for the classical branch choice, i.e., (-1)^(1/3) = 1/2 + sqrt(3)/2*I, then changing the rules will surely make this algorithm fail, and thus return inconsistent or wrong results. If one wants that (-1)^(1/3) simplifies to -1, the only clean solution I see is to write a special function simplify_real to do that, but be prepared to see inconsistent results. +1 This is an ancient question which all CAS have to wrestle with at some point (I remember when it was Maple's turn). What seems superficially to be the elementary solution to the question of odd'th roots of negative reals just leads to horrendous internal problems if followed through. Maths is not always simple. John Paul Zimmermann -- John Cremona --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: [Re: forwarded message from William Stein about R]
I am kind of newbie on both sage and R, but since I have been playing with both of these all week, here is my take. In particular I haven't a clue how R interfaces with SAGE. For example, setting plot parameters via par(ann=0) would be persistent in an R session, ie you wouldn't have to repeat this with every subsequent plot. When calling R from SAGE is there an R session that persists until it is killed explicitly or by exiting SAGE? It calls R from a shared library (R compiled with --enable-R-shlib) through open source interface between python and R called rpy. In R I usually make the plot first, then copy to ps,png,or pdf with dev.copy. I infer from the duscussion below that one doesn't see the plot directly in an R graphics window, but it is copied into the SAGE cell, whatever that is. [I assume the os.curdir+'/out.ps' is directing it to the SAGE cell?] There are two ways (maybe more) to run sage. The issue being discussed is when working on the sage notebook interface, which is through a web browser. Images (png, jpeg) written to os.curdir are grabbed by the notebook and displayed on the appropriate cell in the web browser. Would it be helpful to have the R graphics window, allowing use of interactive graphical functions like locator() and identify(), plus the ability to construct a graph in steps and make additions before copying? It is not entirely true that you cannot see the output in an R graphics window. Running the console interface to sage on a computer with an X server, you can do anything that works in native R or more specifically anything you can do in rpy. The code you wrote works exactly as expected with only a couple minor changes in console sage. import r from rpy r.X11() r.par(ann=0) values = [x for x in srange(0,float(pi),.1)] r.plot(values, [sin(x) for x in values], type='lines',lty=1, col=blue) r.lines(values, [cos(x) for x in values],col=red,lty=2) r.legend(r.locator(1),legend=r.c(sin,cos),lty=r.c(1,2),col=r.c(blue,red)) r.dev_copy(r.postscript,os.curdir+'/out.ps') r.dev_off() When I run that code in the sage notebook interface from a browser on the same computer as the server it works just like the console version by popping up a window. However, a user accessing the server from another machine doesn't have that option (It seems just calling r.X11() caused an infinite loop in this case). This eliminates access to all the locator and identify interactive features and complicates seeing the intermediate forms of a plot while building it (though I can probably make that work with dev_copy). In conclusion, having these same features available in the notebook interface that the R graphics window allows in the console interface would be helpful to me. Jacob --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Warnings from JsMath
On Friday 25 January 2008, Timothy Clemans wrote: See http://www.math.union.edu/~dpvc/jsmath/download/jsMath-fonts.html. There are install instructions for PC, Mac OS X, and Unix users. On Jan 24, 11:45 pm, bill purvis [EMAIL PROTECTED] wrote: Yes, but what about Sage users? They say unpack them in the server tree. I know where my Apache server keeps things, and I've installed them in there. Where is the server tree for the notebook server? Bill -- +---+ | Bill Purvis, Amateur Mathematician| | email: [EMAIL PROTECTED] | | http://bil.members.beeb.net | +---+ --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Warnings from JsMath
Bill wrote: Where is the server tree for the notebook server? The fonts are installed in the computer that is running the browser, not the one that is running the Sage server :-) The idea is that the browser loads the fonts from the hard drive that it was launched from when it visits a web page that uses jsMath. For example, here is a web page that uses jsMath and it will also show the warning message if your system does not have the fonts installed: http://www.math.union.edu/~dpvc/jsmath/examples/TeXbook16.html Ted --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] [Re: forwarded message from William Stein about R]
William asked me to post a copy of an off-line discussion to this list. Here it is: Since I still haven't gotten around to learning SAGE, I am operating from a purely R-centric perspective here. In particular I haven't a clue how R interfaces with SAGE. For example, setting plot parameters via par(ann=0) would be persistent in an R session, ie you wouldn't have to repeat this with every subsequent plot. When calling R from SAGE is there an R session that persists until it is killed explicitly or by exiting SAGE? In R I usually make the plot first, then copy to ps,png,or pdf with dev.copy. I infer from the duscussion below that one doesn't see the plot directly in an R graphics window, but it is copied into the SAGE cell, whatever that is. [I assume the os.curdir+'/out.ps' is directing it to the SAGE cell?] Would it be helpful to have the R graphics window, allowing use of interactive graphical functions like locator() and identify(), plus the ability to construct a graph in steps and make additions before copying? For example, (just making stuff up :-) r.X11() r.par(ann=0) values = [x for x in srange(0,float(pi),.1)] r.plot(values, [sin(x) for x in values], type='lines',lty=1, col=blue) r.lines(values, [cos(x) for x in values],col=red,lty=2) r.legend(locator(1),legend=c(sin,cos),lty=c(1,2),col=c(blue,red)) r.dev.copy(postscript,os.curdir+'/out.ps') r.dev_off() albyn On Thu, Jan 24, 2008 at 02:40:26PM -0500, David Perkinson wrote: - Forwarded message from William Stein [EMAIL PROTECTED] - Date: Thu, 24 Jan 2008 11:38:40 -0800 From: William Stein [EMAIL PROTECTED] To: [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: [sage-newbie] Re: [sage-devel] Re: R and rpy On Jan 24, 2008 9:24 AM, mhampton [EMAIL PROTECTED] wrote: OK I think I have learned a little. The following code seems to flush the output properly, and sends it to the current cell. r.postscript(os.curdir+'/out.ps') r.par(ann=0) values = [x for x in srange(0,float(pi),.1)] r.plot(values, [sin(x) for x in values], type='lines') r.dev_off() Cool. The following slight variant plots perfectly in any cell, etc., and doesn't display any funny cruft: from rpy import r r.png(os.curdir+'/sage.png') r.par(ann=0) values = [x for x in srange(0,float(pi),.1)] r.plot(values, [cos(x^2) for x in values], type='l') _ = r.dev_off() Now somebody needs to start on the nice usage of R from Sage package for Sage, which will have a plot wrapper, etc., etc., This would likely go in *the* already existing directory SAGE_ROOT/devel/sage/sage/stats/ In fact, it would be best if like with symbolic calculus we view this as a general package for doing statistics, which just happens to built almost entirely on R. But we could also provide hooks into some of the very formidable (or not?) statistics capabilities of SciPy. -- William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
