On Wed, Apr 15, 2009 at 10:56 AM, William Stein <[email protected]> wrote:
> On Wed, Apr 15, 2009 at 10:37 AM, Jose Guzman <[email protected]> wrote:
>>
>> William Stein wrote:
>>> 2009/4/15 William Stein <[email protected]>:
>>>
>>>> 2009/4/15 Jose Guzman <[email protected]>:
>>>>
>>>>> 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
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