Jose Guzman wrote: > William Stein wrote: >> On Wed, Apr 15, 2009 at 10:56 AM, William Stein <wst...@gmail.com> wrote: >> >>> On Wed, Apr 15, 2009 at 10:37 AM, Jose Guzman <n...@neurohost.org> wrote: >>> >>>> William Stein wrote: >>>> >>>>> 2009/4/15 William Stein <wst...@gmail.com>: >>>>> >>>>> >>>>>> 2009/4/15 Jose Guzman <n...@neurohost.org>: >>>>>> >>>>>> >>>>>>> Hi there >>>>>>> >>>>>>> I am trying to teach some simple principles of single compartment models >>>>>>> with sage and I plotted a couple of exponential equations in my >>>>>>> notebook. >>>>>>> >>>>>>> Although I got a nice x-axis () and other labels and similar things, I >>>>>>> cannot find a way to plot the y-axis in the vertical axis. Is there >>>>>>> anyway to do it? >>>>>>> >>>>>>> You can take a look to my notebook to see what I mean >>>>>>> http://sagenb.org/home/pub/457 >>>>>>> >>>>>>> Another additional problem is that the LaTeX fonts are pretty small, and >>>>>>> I cannot represent Greek letters (like alpha, tau, pi,etc..) in the >>>>>>> labels (see the syntax bellow). >>>>>>> >>>>>>> xlabel = text('Time (Units of $\tau$)',(3,-.10), rgbcolor='black') >>>>>>> >>>>>>> This \tau does not show up in the graphic, but strange enough, this >>>>>>> works out of the box (pretty small though) >>>>>>> >>>>>>> lnlabel = text('Unrecoverable fraction ($f_{U} = 1 - >>>>>>> f_{S}$)',(4,FS+.05),rgbcolor='black') >>>>>>> >>>>>>> thank you very much in advance for your help and care! >>>>>>> >>>>>>> >>>>>> Just one remar. There is a fontsize option to text: >>>>>> >>>>>> >>>>>> xlabel = text('Time (Units of $\tau$)',(3,-.10), rgbcolor='black', >>>>>> fontsize=30) >>>>>> >>>>>> William >>>>>> >>>>>> >>>>> The second remark is that backslash is an escape character for strings in >>>>> (almost) all programming languages. You have to do \\ to get a single >>>>> backslash, so this works: >>>>> >>>>> xlabel = text('Time (Units of $\\tau$)',(3,-.10), rgbcolor='black', >>>>> fontsize=30) >>>>> >>>>> Or you can do: >>>>> >>>>> xlabel = text(r'Time (Units of $\tau$)',(3,-.10), rgbcolor='black', >>>>> fontsize=30) >>>>> >>>>> >>>>> >>>> Thank you very much for your remarks, everything worked fine, except for >>>> that I did not manage to create a vertical oriented y-axis label. >>>> >>> That might not be implemented yet in Sage directly. >>> >>> >>>> I >>>> think the solution would be to import the matplotlib python module and >>>> use it under Sage, however I did not find a proper manual to follow. >>>> >>> Here is how to use matplotlib directly in the Sage notebook: >>> >>> import pylab as p >>> p.figure() >>> t = p.arange(0.01, 2.0, 0.01) >>> s = p.sin(2 * p.pi * t) >>> s = p.array([float(f(x)) for x in t]) >>> P = p.plot(t, s, linewidth=4) >>> p.xlabel('time (s)'); p.ylabel('voltage (mV)') >>> p.title('Matlab-style plotting in Sage') >>> p.grid(True) >>> p.savefig('sage.png') >>> >>> >> The above example depends on a function f being defined, e.g., >> >> x = var('x') >> f(x) = sin(3*x)*x+log(x) + 1/(x+1)^2 >> >> > Thank you very much for your nice example. Actually I became confused > with all the backend stuff, but this example I realize how to use > matplotlib under Sage, although I have to admit I love the plotting > capabilities of Sage. Is there any way I can have a look to the code so > that I might try to implement some new characteristisc (like y-axis, > fontsize of the axis, etc...)
Yes. In fact, the ability to look at the code is one of the main reasons for Sage's existence! The code for plotting is in the directory: $SAGE_ROOT/devel/sage/sage/plot/ where $SAGE_ROOT is the directory that contains the sage binary. Thanks, Jason --~--~---------~--~----~------------~-------~--~----~ 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 URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
