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2015-08-10 07:09:52 +0100 | asked a question | Defining the derrivative of a function Hello, I want to telle Sage what expression to use for the derrivative of a funtion a. This vould be something like this: diff(a,t) = b^2. But this doesn't do the trick... Example I want to define this set of differential quations:
I want Sage to find the relation between a and u. For that Sage needs to differenciate a twice: - diff(a,t,2) But to be able to calculate d^2/d t ^2 a = d/dt *b^2 = 2 bu, Sage needs to to both differential equations. How can I implemant that? Thanks alot in advance for your replies! Johannes |
2015-08-10 07:03:28 +0100 | asked a question | How to define the derivative of a function Hello, I want to tell Sage what expression to use for the derivative of a funtion a. This vould be something like this: diff(a,t) = b^2. But this doesn't do the trick... Example I want to define this set of differential quations:
I want Sage to find the relation between a and u. For that Sage needs to differentiate a twice: - diff(a,t,2) But to be able to calculate d^2/d t ^2 a = d/dt *b^2 = 2 bu, Sage needs to to both differential equations. How can I implemant that? Thanks alot in advance for your replies! Johannes |