I have one followup comment, to item 2 below.
On Apr 6, 3:11 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I'm forwarding (with permission) John's questions and comments about
> the sage programming
> guide here. I hope somebody can answer them.
>
> -- William
>
> ---------- Forwarded message ----------
> From: John Palmieri <[EMAIL PROTECTED]>
> Date: Sat, Apr 5, 2008 at 6:41 PM
> Subject: Sage documentation: programming guide, sections 2.7.1 and 2.7.2
> To: [EMAIL PROTECTED]
>
> Hi William,
>
> For what it's worth, I'm using Sage 2.11 on Mac OS X 10.5.2.
>
> I have a comment on the Sage Programming Guide, sections 2.7.1 and 2.7.2:
>
> Section 2.7.1 is confusing me, and I think it has a typo.
>
> 1. Item 5 says "You can use any macros included in amsmath, amssymb,
> amsfonts or the ones defined in SAGE_ROOT/doc/commontex/macros.tex."
> However, I tried to use \textup{} and got an error message, saying
> "Unknown control sequence '\textup' ". Note that \textup is defined
> in amsmath. (I can use \text instead, but that's not exactly
> equivalent to \textup.)
>
> 2. Item 6 says "Use view(x) to view the typeset version of an object
> x", yet the example template uses latex(a) rather than view(a). When
> I try latex(a), I get an error:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/Users/palmieri/.sage/sage_notebook/worksheets/admin/10/code/5.py",
> line 404, in <module>
> latex(z)
> File
> "/Applications/sage/local/lib/python2.5/site-packages/sympy/plotting/",
> line 1, in <module>
>
> TypeError: 'module' object is not callable
>
> view(a) and a._latex_() work, though. Should "latex(a)" be changed to
> "view(a)"?
A bit more information: it seems that if I include the line "import
sage.misc.latex as latex" in my file, then "latex(a)" gives an error.
If I don't include it, "latex(a)" works fine, producing output like
'\text{Sq}(1,2,3)'. A little more detail: suppose I use "attach
test", and "test.py" does not include this line. Then everything
works fine. If I add the line, then it breaks. If I then remove the
line, it remains broken.
> 3. Also, the last line of the template is
>
> return `\\frac{%s}{%s}''%(latex(self.numer), latex(self.denom))
>
> When I tried cutting and pasting this, I got errors; I needed to
> change some of the quote marks.
>
> 4. In Section 2.7.2, I am inferring that if I have a _repr_ method but
> no __repr__ method, then Sage will use _repr_ when printing my object.
> But I've tried defining a class with a _repr_ method but no __repr__
> method, and it doesn't print nicely: if I say
>
> sage: a = milnor_mono([1,2]) # for class milnor_mono, no __repr__
> method, only _repr_
> sage: a
> <__main__.milnor_mono instance at 0x76bddc8> # this is not what I want!
> sage: a._repr_()
> 'Sq(1,2)'
> sage: b = milnor([[1,2]]) # have both __repr__ and _repr_
> sage: b
> Sq(1,2)
>
> Thanks,
> John
>
> --
> J. H. Palmieri
> Associate Professor of Mathematics University of Washington
> Box 354350, Seattle, WA 98195-4350 [EMAIL PROTECTED]
> http://www.math.washington.edu/~palmieri/
>
> --
> William Stein
> Associate Professor of Mathematics
> University of Washington
> http://wstein.org
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