On Wed, Sep 17, 2008 at 2:03 PM, Jason Grout
<[EMAIL PROTECTED]> wrote:
>
> William Stein wrote:
>> On Tue, Sep 16, 2008 at 3:56 PM, Jason Grout
>> <[EMAIL PROTECTED]> wrote:
>>> I'm writing an @interact to solve simple 2nd order differential
>>> equations and plot solutions. In it, I'd like to typeset the formula:
>>>
>>> show(a*diff(y,t,2)+b*diff(y,t)+c==0)
>>>
>>> However, what shows up is the word "diff" when I'd really like to see
>>> math notation for a partial or total derivative (depending on the
>>> independent variables declared for y). Is there a nice way to get it to
>>> show up?
>>>
>>> Note that just printing a string doesn't work so well, since a, b, or c
>>> might be negative and then you get something like
>>> 3(d^2y/dt^2)+-2(dy/dt)+-3=0.
>>>
>>> For reference, the current (non/barely) working code is:
>>>
>>> var("x,t")
>>> @interact
>>> def _(y0=(0,4,1/5), y0p=(0,4,1/5),a=(-4,4,1/5),b=(-4,4,1/5),c=(-4,4,1/5)):
>>> y=function('y',t)
>>> show(a*diff(y,t,2)+b*diff(y,t)+c==0)
>>
>> Though ugly to input, I would be tempted to do something like this,
>> since the output looks superb:
>>
>> a = sin(x); y = cos(x^2) + e^(3*pi*x)
>>
>> html("$$%s \cdot \\frac{d^2}{dt^2}\\left[ %s \\right]$$"%(latex(a),
>> latex(y)))
>
> Thanks. Gee, it'd be nice if there was a %l for latex(object), just
> like there is currently a %r and %s which encapsulate calls to
> str(object) and repr(object)
>
> That might be changing the language too much, though. If it's a good
> idea, someone give it a +1.
I suspect that would require changing the core of Python, so it is not
an option.
William
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