On Saturday, September 13, 2014 11:40:26 PM UTC+2, Harald Schilly wrote:
>
> On Saturday, September 13, 2014 11:18:49 PM UTC+2, Chris Maness wrote:
>>
>> Is it possible for sage to use an undefined function such that:
>>
>> diff(f(x(t),y(t)),t) yields the definition of the total derivative?
>>
>>
> I'm not sure about Sage itself ...
>
Well, to clarify, I'm not sure what this output really means or if I'm
doing it wrong:
t = var("t")
f = function("f")
x = function("x")
y = function("y")
f(x(t), y(t)).diff(t)
D[0](f)(x(t), y(t))*D[0](x)(t) + D[1](f)(x(t), y(t))*D[0](y)(t)
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