Student Support Forum: 'substituting functions in algebra' topicStudent Support Forum > General > "substituting functions in algebra"

 Next Comment > Help | Reply To Topic
 Author Comment/Response Al 08/13/12 7:30pm Hi, I'm doing a lot of algebra in mathematica, and I want to simplify expressions by outputting parts of them as functions (and not the value of those functions). The main problem is that I want to replace some bit in an equation, say g(x) e^(w x ) with f(x). (Note: g(x) is some general function of x I do not define). But any time I want to differentiate , I want mathematica to output the derivative as: g'(x) e^{w x} + w f(x) That is, I want mathematica to keep things in terms of f(x) as much as possible. I'm sorry if this wasn't clear, it is a weird example, I know. If anybody has any idea of how I can do this, that would be awesome. -Al p.s. I have tried playing around with the // . (or replace) command, it doesn't seem to replace expressions with actual functions... URL: ,

 Subject (listing for 'substituting functions in algebra') Author Date Posted substituting functions in algebra Al 08/13/12 7:30pm Re: substituting functions in algebra Michael 08/14/12 2:20pm
 Next Comment > Help | Reply To Topic