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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