[sage-support] Problem with derivative of a constant function
Haven't posted anything to this list in a long time. Posting to both lists -- unsure of proper bin. Searched googled, couldn't find this previously reported or solved -- sorry if I'm spamming. Running SAGE Version 3.1.2 on Ubuntu Linux in notebook, though about same happened command line. *Scenario one:* * f = x**2 # Quadratic function g = f.derivative() print g print g(3)* get* * * 2 x 6* Good wonderful. *Scenario two:* * f = x # Constant function g = f.derivative() print g print g(3)* get * 1 Traceback (click to the left for traceback) ... ValueError: the number of arguments must be less than or equal to 0* * 1 Traceback (most recent call last): File stdin, line 1, in module File /home/dino/.sage/sage_notebook/worksheets/admin/3/code/15.py, line 9, in module print g(Integer(3)) File /home/dino/Desktop/sage-3.1.2-debian-x86_64-intel-x86_64-Linux/local/lib/python2.5/site-packages/SQLAlchemy-0.4.6-py2.5.egg/, line 1, in module File /home/dino/Desktop/sage-3.1.2-debian-x86_64-intel-x86_64-Linux/local/lib/python2.5/site-packages/sage/calculus/calculus.py, line 1671, in __call__ raise ValueError, the number of arguments must be less than or equal to %s%len(self.variables()) ValueError: the number of arguments must be less than or equal to 0* Why does SAGE dislike calling a constant function a function? Dean --~--~-~--~~~---~--~~ 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: Sage search engine?
I have used the following as a fudge: http://www.google.com/search?hl=enlr=as_qdr=allq=+site%3Ahttp%3A%2F%2Fsagemath.orgbtnG=Search Dean --- On Mon, Apr 7, 2008 at 5:28 PM, Michael [EMAIL PROTECTED] wrote: The search engine at the bottom of http://www.sagemath.org/documentation.html has stopped working for me in IE, Firefox, and Opera. When I type something into the search box, the results appear but only in the tiny little window at the bottom of the page so I cannot see the results unless I scroll through the little window (by using the arrow keys or by tabbing). If I click on the Sage Search Engine link, then I get a full page and can see the results after typing a query. I believe that the box at the bottom of the page used to work (thus saving me a click). Was this change intended? --~--~-~--~~~---~--~~ 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: Inter-disciplinary applications of Sage (biopython, etc.)
For what we looking? As to explaining, What is this sage thing good for?, an organization of the somewhat-messy published documents https://www.sagenb.org/pub/ might be nice. There's some great stuff in there! Get something for Jason's colloquium talk in a week? A link on the main page http://sagemath.org/ to Here are some uses of sage might make sense. Some has been done with Screen Shots http://sagemath.org/screen_shots., but one has to navigate two pages The art page http://www.sagemath.org:9001/art is nice, but I don't see source code. No one else is volunteering, so give me whatever necessary authority some direction, and I'll do it. I see something like (I'm alphabetizing, and probably missing a lot): Biology (Marshall's note) Breakdown as needed Chemistry Subdivisions as needed Economics (Michael's note) Break up as needed Mathematics calculus DE's Linear algebra - more abstract stuff, et cetera, subdivisions. Physics Subfields as needed. Pretty pictures and math art via sage (of great importance to the mathematics duffers, probably none of whom read this list) Other subfields as necessary. Sage Functionality and good examples of how to code in sage solve sticky problems More breakdown And so forth. I see lots of cool stuff on the course web-page at this linkhttp://wiki.wstein.org/2008/480a/schedule . Better organized, someone could send out notes, We have plenty of examples of the MVT, but need more in this abstract subfield of Group Theory. When most want to know about a software package, s/he asks, How does it make MY life a better place? What can it do? Pictures? What are it's limitations? I don't want to spend a month learning it. Why should I be interested in this open-source 'free' stuff? What's the catch? If no use is immediately obvious, Say, this Mathematica thing has some pretty nice documentation ... Just my verbose $0.02. No one else was responding. I think sage has great potential, but everyone is so busy developing, no-one has time to market. Talk to our friends at Apple about that one. Dean --- On Sat, Mar 29, 2008 at 10:37 AM, William Stein [EMAIL PROTECTED] wrote: Hi, This quarter I'm going to use Sage to teach an interdisciplinary course called Algebraic, Scientiļ¬c, and Statistical Computing, an Open Source Approach Using Sage this quarter. The course webpage is here: http://wiki.wstein.org/2008/480a For me the theme of this course is basically this: now that Sage is here, what does it do? What can we do with it? How can its very broad capabilities be easily explained to people? Somehow we've built up a massive amount of functionality during the last two years, and it's time to step back for a moment and figure out what the heck one can do with sage-2.11.tar.gz. And, given what Sage has become, this is very much an interdisciplinary question. On Sat, Mar 29, 2008 at 4:32 AM, Marshall Hampton [EMAIL PROTECTED] wrote: I use Sage as the primary platform for an interdisciplinary course on bioinformatics. The students are a mix of math, biology, and chemistry graduate students (and a small number of undergraduates). I use (and largely maintain) the biopython spkg for sage. For more detail than you want, you can look at the course homepage: http://www.d.umn.edu/~mhampton/m5233s8.htmlhttp://www.d.umn.edu/%7Emhampton/m5233s8.html Cheers, Marshall Hampton On Mar 28, 5:34 pm, Jason Grout [EMAIL PROTECTED] wrote: Hi all, I'm giving a colloquium talk on Sage in a week to a broad audience of science-related faculty at a liberal arts college. I'd like to point out some applications of Sage in things other than math, like using the biopython project, possibly R, etc. Does anyone have some good material using Sage in science-related interdisciplinary research? If there are lots of responses, I'll make a wiki page with the info. Thanks, Jason -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ 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] Published worksheets, Internal Server Error
The published worksheets https://www.sagenb.org/pub/ have given an Internal Server Error for some time now. Dean --~--~-~--~~~---~--~~ 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] Spline question
Playing with splines for other reasons, I found what I beat down to the following snippet (see attached) *v = [] # Will hold points step = 0.5 # Fineness of my approximation for x in srange(0, 2*pi, step): # Fill parameter *v* with points v.append((cos(x), sin(x))) # on the unit circle. show(points(v, rgbcolor=(1,0,0), pointsize=20) + plot(spline(v), rgbcolor=(0,0,1)))* Aha!, I thought, I'm being clueless. No one splines a parametric curve. But curious, I did some googleing. At http://www.tau.ac.il/~kineret/amit/scipy_tutorial/ there is a nice example at Figure 3, as there is at http://www.tau.ac.il/~kineret/amit/scipy_tutorial/ at Curve fitting and fairing using conic splines. Glanced at a couple SAGE pages, http://www.sagemath.org/doc/html/ref/module-sage.plot.plot.html http://www.sagemath.org/doc/html/ref/module-sage.plot.plot3d.list-plot3d.html, but nothing seemed helpful. Thanks for any ideas. Dean --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~--- inline: spline_attempt.png
[sage-support] Re: Animation speed question
When I used *step = 0.095*, I have 64 frames, close enough to the wikipedia image's of 66. But resultant animation is choppy, where wikipedia's is fairly smooth. I tinkered with a spline to smooth out a different curve, but it ran fantastically slow, -- something about too many points? -- so gave up on it for this image. Thanks anyway. Will occasionally return to this -- the problem interests me. Dean --- On Sun, Mar 2, 2008 at 1:15 PM, Carl Witty [EMAIL PROTECTED] wrote: On Mar 1, 1:09 pm, dean moore [EMAIL PROTECTED] wrote: When I wrote the code living at https://www.sagenb.org/home/pub/1687/ I was inspired by the wikipedia image (made via MuPAD) on the page at http://en.wikipedia.org/wiki/Hypotrochoid (permalink http://en.wikipedia.org/wiki/Image:HypotrochoidOutThreeFifths.gif). It looks like both images animate at about 10 frames per second in my Firefox; your image has 240 frames, and the Wikipedia image has 66, so the Wikipedia animation completes in about 1/4 the time. I don't know why setting delay=1 doesn't seem to be honored. I tried delay=100 and that worked. (I'm guessing it's a deliberate design decision in Firefox, to prevent people from making fast, flickery animated GIFs; but it also might be a bug in Sage, or a bug in ImageMagick or Firefox.) But anyway, the solution is to use fewer frames. Carl --~--~-~--~~~---~--~~ 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: Question on published worksheets
As to the other stuff, I did, not now important. I made a few improvements to fix the wiggling graph problem, clicked on publish to re-publish, and ... Under published documents there are now two files named animated_derivative_line https://www.sagenb.org/home/pub/1697. I thought, Maybe a computer thing; give it a few minutes to update. Signed out of SAGE. At least ten minutes. Still two copies. I recall that in my futzing I deleted the original, copied the code under the same name. Thanks for any guidance sorry for the hassle. Dean On Wed, Feb 20, 2008 at 10:41 PM, William Stein [EMAIL PROTECTED] wrote: On Wed, Feb 20, 2008 at 8:17 PM, dean moore [EMAIL PROTECTED] wrote: I recently posted on the wiggling graph problem, and do appreciate the speed at which it was pounced on. This was motivated by the published https://www.sagenb.org/home/pub/1691/ . After doing a work-around to the wiggling graph problem, I wanted to re-upload my new improved file. But the Edit facility's link was https://www.sagenb.org/home/pub/1691/edit_published_page , which re-directed to one of my pages, https://www.sagenb.org/home/dino/12/ , which looked truly bizarre -- at least to me. Why? Can you be clearer? To me it makes sense that I can't edit (and possibly vandalize) someone else's page, but shouldn't we be able to edit improve our own? You cannot edit or vandalize anybody else's pages. You can only edit *copies* of them. You can edit your own then republish it by clicking publish again. Oh, I know, Write it right in the first place. But the software world changes faster than the mythical Proteus. Just wondering. Clicking Edit a copy lets you edit a copy. If you edit the original that you published then click publish it will update the one that you originally published. If things don't work like that it's a serious bug. 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 -~--~~~~--~~--~--~---
[sage-support] Re: Animation wiggling question
Thanks for the response! I used some slightly different code; in case anyone else deals with the wiggling graph problem before the next SAGE is out, one snippet that worked for me follows: *def f(x): return x*sin(x^2) v = [] # Define graph outside loop to avoid wiggling graph problem: graph = plot(f, [-1, 3], thickness = 1, rgbcolor = (0,0,1)) # Now animate this graph: for i in srange(10): v.append(graph) curve = animate(v) curve.show()* --- The graph was immobile. Dean --- On Wed, Feb 20, 2008 at 3:41 PM, Jonathan Bober [EMAIL PROTECTED] wrote: The documentation for plot() says: The actual sample points are slightly randomized, so the above plots may look slightly different each time you draw them. I assume that this an easy way to get the behavior: Note that this function does NOT simply sample equally spaced points between xmin and xmax. Instead it computes equally spaced points and add small perturbations to them. This reduces the possibility of, e.g., sampling sin only at multiples of 2pi, which would yield a very misleading graph. So, perhaps this is a feature. But it seems to me that the endpoints, at least, should be always included (if possible) when graphing a function, so maybe this is a bug. (Although it is nice to not include the endpoints when plotting something like sin(1/x).) But anyway, I think that you should be able to instead do: f = x*sin(x^2) v = [] graph = plot(f, [-1, 3], thickness = 1, rgbcolor = (1, 0 ,0)) for i in srange(50): v.append(graph) curve = animate(v) curve.show() On Wed, 2008-02-20 at 16:01 -0600, Jason Grout wrote: dean moore wrote: I ran the code now living at https://www.sagenb.org/home/pub/1691/, but the function's graph wiggles, most notably by the right endpoint. Tested, both Firefox Internet Explorer. Same thing. Read through http://www.sagemath.org/doc/html/ref/module-sage.plot.plot.html , but found nothing. I am animating a graph, so it appears in all frames. I fiddled a good deal, but was left wondering, Is it weirdness with SAGE, or my bad coding? I beat the problem to a snippet: /f = x*sin(x^2) v = [] for i in srange(50): graph = plot(f, [-1, 3], thickness = 1, rgbcolor = (1, 0 ,0), plot_points = 1000) v.append(graph) curve = animate(v)/ /curve.show() Wow, this is a great animation. Sorry the plotting is so distracting at the ends! To narrow down the issue, I executed the following after the code you gave: sage: endpoints = [v[i][0].xdata[-1] for i in srange(50)] sage: max(endpoints) - min(endpoints) 0.0039542538407206784 This computes the endpoints for the x-values that are sampled to plot the graph. That's quite a spread for having the exact same inputs, which explains the noticable wiggling. So now the question is: why in the world do we have such different endpoints? I might point out that the wiggling is not just at the endpoints of the graph. The wiggling is throughout the graph; it's just really noticeable at the endpoints. Jason --~--~-~--~~~---~--~~ 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] Question on published worksheets
I recently posted on the wiggling graph problem, and do appreciate the speed at which it was pounced on. This was motivated by the published https://www.sagenb.org/home/pub/1691/. After doing a work-around to the wiggling graph problem, I wanted to re-upload my new improved file. But the Edit facility's link was https://www.sagenb.org/home/pub/1691/edit_published_page , which re-directed to one of my pages, https://www.sagenb.org/home/dino/12/ , which looked truly bizarre -- at least to me. To me it makes sense that I can't edit (and possibly vandalize) someone else's page, but shouldn't we be able to edit improve our own? Oh, I know, Write it right in the first place. But the software world changes faster than the mythical Proteus. Just wondering. Dean --~--~-~--~~~---~--~~ 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] More Extreme Newbie Development Questions
Took me awhile to respond. Distractions. Last generated a few responses, replying to all under a new subject line (last thread was getting clogged), in no particular order, David Joyner: Thanks for the cool gif! It would be great f you could post it to http://wiki.sagemath.org/pics (or it you tell me what to post, I will for you). Futzed around, logged in, but couldn't figure it how to post it. Attached. It's easy to modify the original source code at https://www.sagenb.org/home/pub/1687/ juggle constant to make various relations. Thanks if you can post this, or tell me how! mabshoff: We want to channel traffic into two mailing lists: sage-support for everything that isn't an developer issue and sage-devel for developers issue. Many issues on sage-newbie didn't get the attention they needed because too few people were reading it. Your chances to get replies are much better on sage-support. I thought sage newbie no longer existed. Do correct me all else if I am confused. Jason Grout: This is great stuff! I think it's a perfect place to post it. We really ought to set up a library of wonderfully documented examples of how to use Sage, something like the Maple application center or the Mathematica Demonstrations project. The current list of notebooks Thanks. Glancing at the published notebooks, many are quickie solutions (and not documented at all -- no top documentation saying This program differentiates polynomials; we use this logic ... shuts off my brain) to narrowly-focussed problems not of much interest to, say a high school / college student wanting to know, What's this SAGE thing about? What's in it for *me*? Might be good to have separate sets of examples for varied grade levels. Most college kids are concerned about learning differentiation integration, solving DE's, systems, engineering/science problems, -- not learning what a parabola is (though I've taught a few ...). Just an idea. Dean, you mentioned the frustration of trying to learn a new system. Was there anything that we could have done to make it easier (sorry about the unanswered posts to sage-newbie; we all kind of dropped the ball with keeping up with so many different mailing lists). There's always that learning curve, shaking a fist at the computer, then the Aha! moments. Wish I had a good answer. Lots of good WELL-DOCUMENTED examples? Then I can browse published worksheets, Oh, this person did this thing at least related to what I'm looking at? And maybe a place to post those *** well-documented examples *** for review, Here's a nifty workbook I did that illustrates the manifold uses of spendiferous functions, or maybe more importantly, This worksheet illustrates how to use SAGE to do this not-easy-to-code thing? (whatever), and someone reviews it, Yes, darn it, that is solid; let's post it for all under a name that makes sense (another problem with the published worksheets). Elsewhere observed, ... it is not organized or searchable (I don't think) ... This needs work. Having played with SAGE a bit, I see it trying to go from being a garage band to Led Zeppelin (well, that's overstating a bit), and sometimes the old ideas need revamped. Dean, I guess I should add that just last year, I was a newbie sage user as well. I felt how much people welcomed newcomers and cared about helping people get up to speed ... You guys / gals / whoever were pretty cool. When questions went unanswered I kind of figured, Oh, we all live busy lives. I had the impression that others wanted quickie answers -- those happen, but don't count on them often. Can't one set a welcome message to all new users of a group to make policies clear? Would love to do some development of whatever, examples, documentation, wherever, a worthwhile contribution, and doubtless I'm not alone. Some things could perhaps be more clear, We need more good functionality in this small subset of calculus, The spendiferous functions code is poorly documented, full of magic numbers obscure logic needs cleaned up (whatever). Dean --~--~-~--~~~---~--~~ 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: animation question
Apparently I had the square brackets placed wrong. My mistake. The code *arm= animate(line([(0,0),(cos(i), sin(i))], rgbcolor=(1,0,1)) for i in srange(0, 2*pi, 0.3)) arm.show()* seems to work. Thanks ... mea culpa for not finding the obvious substitution. Was barking up the wrong tree. Dean --- On Thu, Feb 14, 2008 at 1:46 PM, William Stein [EMAIL PROTECTED] wrote: please post what you think the obvious substitution is. On 2/14/08, dino [EMAIL PROTECTED] wrote: I posted this to the sage-newbie list, but it never generated a response. I understand this list has more people in the know. We have the following snippet: arm= animate([arrow((0,0),(cos(i), sin(i)), rgbcolor=(1,0,1)) for i in srange(0, 2*pi, 0.3)]) arm.show() It generates a rotating arrow. I wish to generate an animated line, but the obvious substitution fails, generating a graph but no line. Fiddling with the code in other ways also fails. Ideas? Thanks! Dean -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
