Thanks John. That is much cleaner than my approach.
Ryan
On Tue, Feb 8, 2011 at 1:34 PM, John H Palmieri <jhpalmier...@gmail.com> wrote:
>
>
> On Tuesday, February 8, 2011 11:03:27 AM UTC-8, Ryan Krauss wrote:
>>
>> I am a Python user who has made minor use of Maxima on occasion. I am
>> trying to make the switch to Sage. I have a piece of Maxima
>> functionality that I am struggling to make work in Sage. I need to
>> declare that two variables x1 and x2 depend on t. I don't yet know
>> their expressions. For now, I just need to be able to take their
>> derivatives with respect to t and get \dot{x1} and \dot{x2}. Maxima
>> allows this through the depends function. I think I have this more or
>> less working in Sage:
>>
>> Maxima code:
>> depends(x1,t);
>> diff(x1,t);
>>
>> result: $$\frac{d}{d\,t}\,x1$$ (x1 dot, basically)
>
> How about this:
> sage: t = var('t')
> sage: x1 = function('x1', t)
> sage: x1.diff(t)
> --
> John
>
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