#4102: make bessel_J symbolic
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Reporter: jwmerrill | Owner: burcin
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.6
Component: calculus | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Benjamin Jones | Merged in:
Dependencies: | Stopgaps:
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Comment (by kcrisman):
Nice! A few comments of the type you solicited:
* Why `typ` and not `type`? Some Python reserved thing, maybe? But it
looks like a typ-o to the (quickly reading) end user.
* I'd like to be able to plot `f(x) = Bessel(0)` but maybe that doesn't
make sense? I guess a variable is necessary... anyway, just throwing it
out there.
* `f = maxima(Bessel(typ='K')(x,y))` turns out great, but does it convert
back? Like `f.derivative('y')` is `-(bessel_k(x+1,y)+bessel_k(x-1,y))/2`,
but does it then (when put in the `_sage_` method) go back to "our"
uppercase Bessel functions?
* Maybe Python 3 string formatting? Though I am not sure how to mix that
with LaTeX braces.
* At least some of the error messages should be in doctests, maybe the
ones with the wrong type and a non-implemented system.
* `class_attrs['_conversions'] = {} ` --- what do we do with this in
Maxima, then? Maybe it's better to raise an error; Maxima tends to
otherwise just take things as new variables, which could be dangerous.
* How many of the currently-deleted doctests do you think would be worth
preserving in the long run? Any deprecation needed here?
Anyway, clearly a lot of planning and looks very promising!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4102#comment:13>
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