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Topic: Variable transformations
Replies: 3   Last Post: Sep 8, 2013 2:52 AM

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Nicholas Chisholm

Posts: 1
Registered: 7/23/13
Variable transformations
Posted: Jul 23, 2013 4:43 AM
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Say I have some differential equation in terms of the independent variable x and dependent variable f(x). Now say I want to do a coordinate/variable transformation where x=x(u) and I want to write my equation in terms of only u and f(u). By pencil & paper, you can do this by applying the chain rule, but I have a complicated equation and I want to check if I've made an algebra slip-up (it involves several dependent and independent variables and up to 4th order derivatives). Is there any way to automate something like this in Mathematica? I've messed around with replacement rules, but I can't get Mathematica to do things quite how I want.


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